79results about How to "Measurement does not affect" patented technology

The invention provides a space division multiplexing Mach-Zehnder cascade fiber interferometer and a measurement method thereof. The space division multiplexing Mach-Zehnder cascade fiber interferometer is composed of a wide-spectrum light source, a photodetector, a coupler, a single-mode connection optical fiber, an optical fiber sensor, a continuous-variable optical delay device, and a reflector, wherein the optical fiber sensor is composed of a Mach-Zehnder interferometer and forms a cascade optical fiber sensor array or a network. The wide-spectrum light source and a photodetector are connected with the optical fiber sensor through the coupler to form a sensor network; and the sensor network is connected with the continuous-variable optical delay device and the reflector through the coupler and is used for enquiring and demodulating the optical fiber sensor. The space division multiplexing Mach-Zehnder cascade fiber interferometer solves the problem of breakage of the optical fiber sensor array, improves the anti-damage characteristics of the optical fiber sensor array and the network and solves the temperature compensation problem in the measurement process. The space division multiplexing Mach-Zehnder cascade fiber interferometer has the advantages of simple interferometer structure, easy implementation, improved measurement reliability and low cost, and better facilitates the technology generalization and popularization.

The invention discloses a wave aberration detection device of an objective lens imaging system. The wave aberration detection device comprises a light source, a collimating mirror, a spectroscope, a focusing mirror, a standard spherical reflector, a data processing unit, a wave-front sensor, a first accurate adjustment table and a second accurate adjustment table, wherein the collimating mirror, the spectroscope, the focusing mirror and the standard spherical reflector are sequentially placed in the light emitting direction of the light source, and the wave-front sensor, the first accurate adjustment table and the second accurate adjustment table are connected with the data processing unit. In the wave aberration detection device, the measurement processes and the system error calibration process are switched by changing the position of the standard spherical reflector 5; in the two measurement processes, the standard spherical reflector 5 has the same adjustment accuracy, and therefore the calibration, measurement and correction of device and system errors can be effectively completed, and the wave aberration measurement accuracy is improved. No high-precision standard light source is needed, and cost is reduced; A system error calibration method of the wave aberration detection device is simple and compact in structure and has the advantages of being easy to obtain and the like, and the wave aberration detection of the objective lens imaging system to be detected can be completed through the simple system.

The invention belongs to the technical filed of optical measurement, and more particularly relates to an imaging system using a plane mirror to integrate lights and an optical measuring device. The imaging system comprises an imaging light-gathering unit, an image detector and a first removable reflecting mirror, wherein a first light beam is emitted to a sample, and a second light beam is transmitted to the sample through the first removable reflecting mirror, the light reflected from the surface of the sample is imaged on the image detector by the imaging light-gathering unit, the first removable reflecting mirror is positioned in or out of a system light path so that the first light beam and the second light beam are superposed or separated, and through adjusting the removable reflecting mirror, identification and positioning of measuring points and position calibration and measurement of sample surface measuring points and detection light beam light spots can be realized. According to the invention, self characteristics such as luminous flux, chromatism, aberration, polarization and the like of a detection light path are completely not affected, thus imaging without double images can be realized; and in addition, the structure is simple and the cost is low.

The invention provides an optical fiber displacement sensor with an ultra-short baseline compliant cylinder structure and an optical fiber strain gauge. The optical fiber strain gauge comprises an optical fiber displacement sensor body (1), a measure baseline (4), a baseline fixing device (5), a suspension system (3), a measure control and signal recording and processing system (6) and a measurement calibration device (7); the optical fiber displacement sensor body (1) is fixed on a first bed rock (21) and connected with the head end (41) of the measure baseline (4); the tail end (42) of the measure baseline (4) is provided with the measurement calibration device (7) and fixed on a second bed rock (22) through the baseline fixing device (5); the suspension system (3) is arranged in the middle of the measure baseline (4), and the displacement sensor (1) and the measurement calibration device (7) are connected with the measure control and signal recording and processing system (6) through a signal connecting wire. The optical fiber displacement sensor is applied to a geophysical research, observation of crustal strain and solid tide, obtaining of earthquake precursor information and the like.

The invention provides a short-base-line differential laser strain measuring instrument. The short-base-line differential laser strain measuring instrument comprises a single frequency laser interference sensor, a suspension system, a measurement base line rod, a base line fixing device, a measurement control and signal recording and processing system, a measurement calibration device and a measurement reflector limiting system, wherein the single frequency laser interference sensor fixed on a first base rock and a measurement reflector form an integral single frequency laser interferometer; the measurement reflector is connected with the head end of a measurement base line through the measurement reflector limiting system; the tail end of the measurement base line is provided with the measurement calibration device, and is fixed on a second base rock through the base line fixing device; the suspension system is mounted in the middle of the measurement base line; and the single frequency laser interference sensor and the measurement calibration device are connected with the measurement control and signal recording and processing system through a signal connecting wire. The short-base-line differential laser strain measuring instrument has high cost performance, and can be widely applied to transformation and construction of a precursor digital network.

The pulse wave conducting time measuring method and system for the continuous measurement of blood pressure includes setting pulse wave sensor on the head of the testee, setting electrocardiac and pulse wave sensors in different network nodes, setting controlling computer system, connecting the sensors via the node controllers and communication protocol with the computer system, and adopts power saving intermittent power supply scheme. The present invention is suitable for measuring the pulse wave conducting time in operation condition, has raised measurement accuracy, low power consumption and reduced testee load, and is favorable to the real-time continuous measurement and monitoring of several sensing devices and several tested targets.

The invention discloses a flight parameter measurement system for a small-size bypass aircraft, which can achieve the purpose of enhancing the measurement convenience and the accuracy of measured data. The flight parameter measurement system for the small-size bypass aircraft comprises a test platform seat, a linear guide rail, a torque sensor, a universal joint coupler, five stretch-press measuring devices, the small-size bypass aircraft, a work table, two knuckle bearings, a hinge, a sliding bearing, an optical axis supporting seat, two axial spacing rings, a fixed axis, an optical axis and three steel poles. In the invention, a sensor is orthogonally arranged according to a coordinate system of a machine body, the torque sensor is arranged along the axis direction of the horizontal machine body, a stretch-press sensor is arranged by adopting the knuckle bearing and the hinge, the torque sensor is connected with the small-size bypass aircraft through the universal joint coupler, and the stretch-press sensor is connected with the small-size bypass aircraft through the knuckle bearing, and therefore, the measurement of the quality, the mass center position, the engine thrust, the pitching moment, the rolling moment and the yawing moment of the small-size bypass aircraft is realized.

The invention provides a control system for a main pump measurement circuit of a digital nuclear power station. The control system for the main pump measurement circuit of the digital nuclear power station comprises a signal acquisition module, a high-rotations-speed measurement channel, a low-rotation-speed measurement channel and a rotation speed judging and displaying module, wherein the signal acquisition module is used for acquiring a rotation speed frequency signal of a main probe and a rotation speed frequency signal of a standby probe and outputting the acquired rotation speed frequency signals to the high-rotation-speed measurement channel and the low-rotation-speed measurement channel after conducting isolation processing on the acquired rotation speed frequency signals, the signals output by the high-rotation-speed measurement channel and the low-rotation-speed measurement channel are transmitted to the rotation speed judging and displaying module, rotation speed judgment is conducted through the rotation speed judging and displaying module according to the received output signals, the rotation speed is displayed according to the rotation speed judgment result, and the received rotation speed frequency signals are isolated and processed through the low-rotation-speed measurement channel so that current signals can be output. According to the control system for the main pump measurement circuit of the digital nuclear power station, display can be achieved as long as a main pump rotates, rotation speed frequency signals of the main pump can not be disturbed by a power distributor, and measurement of the rotation speed can not be influenced by temperature measurement signals.

A conductive slip-ring dynamic contact resistance measuring tool belongs to an electric-contact sliding connection technology field. When a slip ring works normally, a circuit resistance change situation can not be monitored because a resistance measurement point is not static. By using the tool of the invention, the above problem can be solved. The tool comprises: a rotation apparatus, a static crimping apparatus and a rotation crimping apparatus. According to the invention, through the two crimping apparatuses, concentric connection of a rotating shaft of the rotation apparatus and a conductive slip ring rotation end. The measurement point of the conductive slip ring rotation end is converted into the static measurement point through the idiostaic static crimping apparatus. Therefore, monitoring of fluctuations of the conductive slip-ring single circuit resistance can be realized through accessing a measuring instrument. The tool of the invention is suitable for the conductive slip-ring dynamic contact resistance measuring.

The invention provides a disconnected electrical contact fusion welding force detection device, which is used for measuring the welding force of contact points and contacts used in relays, contactors, switches, and the like. The disconnected electrical contact fusion welding force detection device comprises a welding force measuring device and a force application mechanism (a vibration exciter, a linear motor and an air cylinder), and a fixture, wherein the welding force measuring device comprises a mechanical sensor, a reed, a support base, and a shell and can be mechanically set to zero. The disconnected electrical contact welding force detection device can accomplish the measurement on the welding force (including static welding and movable welding) of the contact points and the contacts by combining a data acquisition device and a rear instrument.

The invention provides a right angle calibration block layout method, a coordinate calibration method and a coordinate adjusting method for a gear measurement center. The layout method is to set the right angle calibration block layout fixed on the non-rotary table at a position other than the measurement stroke, and then use the reference template and the right angle calibration block to establish an indirect gear measurement center coordinate calibration method. The coordinate calibration method comprises steps of 1) preliminarily determining the position coordinates of the right angle calibration block in a rotation center; 2) determining the position coordinates of a probe in the rotation center; and 3) accurately determining the position coordinates of the right angle calibration block in the rotation center. The invention solves the problems that the coordinate calibration program in the traditional gear measuring system is complicated, the precision is low, the calculation method is complicated and the requirement for the positioning position of the probe is high; position coordinates of the tangential X axis, the radial Y axis and the vertical Z axis are precisely determined when the right angle calibration block is at the zero point relative to the rotation center; and the position coordinates of the center of sphere of the probe head relative to the measurement system are determined.

The invention relates to equipment for measuring intra-ocular pressure, which is mainly characterized by comprising a probe supported in a probe shoulder, a plurality of coils wound on a framework, and a circuit board for collecting and processing voltage signals of the coils. The probe consists of a plastic probe head and a magnetic probe tail, and the probe tail consists of one or several joints of magnetic needles. The equipment for measuring the intra-ocular pressure is mainly characterized in that the coils are electrified with different directions to drive the magnetic needles at the probe tail to ensure part of the probe head to move toward or far away from a cornea at a high speed, and the intra-ocular pressure is figured out by the time interval between the probe closing to the cornea and the probe just leaving the cornea. By adopting the technical scheme of the invention, the speed-up time of the probe is shortened, the retention time of high speed motion is long, and the system efficiency is high, thereby fully ensuring that the probe can hit against the surface of the cornea at a speed high enough, greatly reducing the complexity and cost of the system, and simultaneously improving the reliability of the system.

The invention discloses a flexural rigidity testing device in copious cooling and high-temperature environments. The flexural rigidity testing device comprises a laser displacement sensor, a high-rigidity rod, a laser measurement group, a force sensor, a lifting device and a high-low temperature chamber, wherein a to-be-tested member is fixed in the high-low temperature chamber through a to-be-tested member installing base, the high-rigidity rod vertically penetrates through the high-low temperature chamber to act on the to-be-tested member, the upper end of the high-rigidity rod is fixedly connected with the lifting device through the force sensor, and the laser displacement sensor and the laser measurement group are arranged outside the high-low temperature chamber and are opposite to an observation window. According to the flexural rigidity testing device, loading is carried out by the high-rigidity rod, the direction of an acting force is not changed, a measurement moment arm is obtained by the laser displacement sensor, corner deformation is obtained by the laser measurement group, and thus a bending moment-angular deformation curve of the flexural rigidity of the to-be-tested member is accurately obtained. The flexural rigidity testing device is convenient to use, high in reliability, good in instantaneity and high in measurement precision.

The invention belongs to the technical field of optical precision measurement and relates to a measuring method of an ultralong focal length of a penta prism combination, and a measuring device thereof. The method integrates a penta prism focus fixing method and an ultralong focal length measuring technology of a composite lens and helps realize low-cost and high-precision ultralong focal length measurement of large-caliber lenses. The method helps transform a focus fixing process in an optical axis direction into a variance measurement process of an imaging position in a vertical optical axis direction by using the penta prism to refract an optical path, and is further combined with the ultralong focal length measuring technology of the composite lens to compress length of the optical path and improve measurement resolution. The measuring device comprises a light source, the penta prism, a reference lens, an alignment target, a CCD detector and a collimator mirror, has the advantages of simple optical path structure, less aberration introduced by an optical component, less systematic error, high measurement sensitivity, high resistance to ambient interference, and can be applied to detection of the ultralong focal length lens and high-precision focal length measurement during assembling an optical system.

The invention relates to a measuring device of rigidity and damping of tangential contact, belonging to the technical field of dynamics measurement and comprising a testing frame, an excitation applying device, a measuring device and a loading device, wherein the measuring device and the loading device are respectively and fixedly arranged in the testing frame; the excitation applying device is fixedly arranged above the testing frame and corresponds to a sample to be measured; the measuring device and the loading device are connected; and the loading device is arranged at the bottom of the testing frame. The measuring device adopts a mode that the same tested samples are respectively arranged at the two ends to clamp another suspended testing sample, so as to lead a vibrational model to be simple, thus guaranteeing feasibility and reliability of dynamic method analysis, realizing reliable measurement of rigidity and damping of tangential contact, easily controlling the size of pretightening force and contact area, and furthest reducing the influence of vibration to measurement.

The invention provides an ultra-short base line differential plate type optical fiber displacement sensor and an optical fiber strain gauge. The ultra-short base line differential plate type optical fiber displacement sensor comprises an outer frame, wherein an outer ring of a displacement conversion device is tightly pressed on the outer frame by a pressing ring with external threads, a threaded pillar of a central press washer penetrates through a central hole in the displacement conversion device, and a first Faraday rotating mirror and a second Faraday rotating mirror are solidified on the central press washer; and an optical fiber coupler and a phase modulator are fixed on the surface of the inner wall of the outer frame, the outer frame and a fixed base are fixed, a first measurement optical fiber and a second measurement optical fiber are respectively wound into multilayered optical fiber loops with hollow plate type layered structures, the first measurement optical fiber and the second measurement optical fiber are respectively solidified on the upper surface and the lower surface of the displacement conversion device, the coupler is connected with the fist Faraday rotating mirror, the phase modulator and a detector, the fist measurement optical fiber is connected with the first Faraday rotating mirror, the phase modulator is connected with the second measurement optical fiber, and the second measurement optical fiber is connected with the second Faraday rotating mirror. The ultra-short base line differential plate type optical fiber displacement sensor and the optical fiber strain gauge are mainly used for observing earth crust strain and solid tide, and acquiring earthquake precursor information.

The invention discloses a normal position zero gas back-blowing type CEMS (continuous emission monitoring system) probe on-line calibration method and device, and belongs to fume on-line continuous monitoring and calibrating. According to the device, a probe is not extracted, a probe measuring region is provided with a shield, pressure for providing a system for performing back-blowing is regulated through shielding the probe measuring region, excessive back-blowing is performed on the measuring region, and fume in the measuring region is evacuated; zero air is fully filled in a calibration pond, the zero creep calibration operation is performed on the system, the calibration pond is fully filled with range point standard air, and the range drifting calibration operation is performed; the calibration is finished, the calibration pond is filled with the zero air again; and finally, the shield in the measuring region is withdrawn, the compressed air back-blowing pressure is regulated, and the system is at a normal measuring condition. The normal position zero air back-blowing type CEMS probe on-line calibration method and device provided by the invention can perform completed original light path on-line calibration under the condition that the probe is not extracted in a measuring system, and a measuring light path and a calibration light path are completely consistent.

The invention discloses a self-evaporator liquid level measuring device based on a dual-pipe air blowing method. In the device, a first air blowing pipe (1), a second air blowing pipe (2) and a self-evaporator (9) are connected; the first air blowing pipe (1) and the second air blowing pipe (2) extend into the bottom of the self-evaporator (9); the height difference of the bottom ends of the first air blowing pipe (1) and the second air blowing pipe (2) is h2; a pipeline which is connected with the first air blowing pipe (1) is internally provided with a first air blower (3), a first separation tank (7) and a first differential pressure transmitter (5); a pipeline which is connected with the second air blowing pipe (2) is internally provided with a second air blower (4), a second separation tank (8) and a second differential pressure transmitter (6); and the first air blower (3), the second air blower (4) and an air source are connected. The self-evaporator liquid level measuring device provided by the invention is widely applied to an aluminum oxide plant, thus pollution is reduced effectively, the plant environment is protected, and better working environment is created for workers.

The invention belongs to the technical field of display panel detection, and discloses a method, a device and a system for remotely measuring a Flicker scintillation value of a liquid crystal module.The method includes: carrying out continuous image capturing on a display image of the liquid crystal module under a certain common electrode voltage; obtaining the average brightness of the image frames, obtaining the change relation of the brightness with the number of collected frames or time, i.e., the time domain signal of the brightness, obtaining the spectrogram of the brightness through the time domain signal, and obtaining the Flicker scintillation value of the liquid crystal module to be detected under the common electrode voltage through the amplitude of the specific frequency wave.The device comprises equipment for continuously capturing images of a liquid crystal module under a certain common electrode voltage, A calculation processing module used for calculating the averagebrightness to obtain a time domain signal of the brightness, A Fourier transform module used for carrying out fast Fourier transform on the time domain signal of the brightness, and A Flicker scintillation value calculation module used for calculating a Flicker scintillation value. according to the method and the system, the Flicker scintillation value of the display screen can be remotely measured, and the method and the system are used for monitoring the flicker degree of the liquid crystal display screen in real time in a panel production line.

The invention provides a push-pull optical fiber displacement sensor with a compliant cylinder structure and an optical fiber strain gauge. A first optical fiber displacement sensor fixed on a first bed rock is connected with the head end of a measure baseline bar; a second optical fiber displacement sensor fixed on a second bed rock is connected with the tail end of the measure baseline bar; the first optical fiber displacement sensor and the second optical fiber displacement sensor are connected with a measurement control and signal recording and processing system through signal connecting wires; a laser output a light source passes through an isolator, and then the energy is averaged into two parts by a first coupler; a half of light energy is injected into the first optical fiber displacement sensor, and the other half of light energy is injected into the second optical fiber displacement sensor. The push-pull optical fiber displacement sensor can be widely applied to the field of geophysical researches of observing crustal strain and solid tide, obtaining earthquake precursor information and the like.

The invention discloses a relative position adjustment system for a vehicle body. The relative position adjustment system comprises a measurement body which is used for measuring the relative positionbetween a calibration beam and the vehicle body and a remote-control-type straightening device which is used for adjusting the position and angle of the calibration beam; during adjustment, an operator remotely controls the straightening device to move according to the relative position between the calibration beam and the vehicle body obtained by the measurement device until the position of thecalibration beam meets the requirement. According to the relative position adjustment system, a 3D measurement technology and a remote control adjustment technology are integrated, a 3D measurement device can quickly and automatically obtain the relative position between the calibration beam and a vehicle rear axle, after seeing the position, the operator can directly adjust the height, the horizontal position and the swinging angle of the calibration beam through remote control, and judge whether or not adjustment is reasonable and proper according to the relative position information which is measured in real time, thus repeated reading and adjustment are omitted, the working efficiency is significantly improved, and the labor intensity is lowered.

The invention discloses an optical coherence based human eye measurement device and an optical coherence based human eye measurement method and relates to the technical field of human eye measurement devices and human eye measurement methods. The optical coherence based human eye measurement device comprises a low-coherence light interference unit, a quick zooming unit, a multi-reference-arm unit, a photoelectric triggering unit, a servo motor, a turn table and a computer, wherein the low-coherence light interference unit is in light connection with the quick zooming unit through a second optical fiber and is in light connection with the multi-reference-arm unit through a third optical fiber, the computer is electrically connected with the low-coherence light interference unit and the photoelectric triggering unit through a first signal line and a second signal line respectively, two paths of light outputted by the low-coherence light interference unit enter the quick zooming unit and the multi-reference-arm unit respectively, and the servo motor drives the turn table to rotate so as to zoom light outputted by the low-coherence light interference unit and switch optical paths. The optical coherence based human eye measurement device is capable of accurately measuring related parameters including corneal thickness, anterior chamber depth, crystalline lens thickness and vitreous body thickness of optical axes of human eyes.

The invention discloses a sound pressure sensitivity calibration cavity and a testing method thereof. The calibration cavity consists of two rigid cavities which are a standard cavity and a measuringcavity; the standard cavity is a small volume cavity whose internal and external are in cylindrical shapes, and a transmitting transducer and a reciprocal transducer are installed in the standard cavity during measuring, so that the accurate measuring on standard cavity reciprocal constants and the transfer impedance of the transmitting transducer and the reciprocal transducer can be accomplished;and the internal of the measuring cavity is in a cylindrical shape, and the external of the measuring cavity is a triangular rigid cavity, and during measuring, the transmitting transducer, the reciprocal transducer and a measured hydrophone are respectively fixed on three faces of the triangular cavity, located on the central face of the cylindrical inner cavity and in symmetric distribution. The testing method is a four-transducer reciprocity method. The beneficial effects of the calibration cavity and testing method are that through the calibration by using the double coupled cavity and the four-transducer reciprocity method, the measuring precision of low frequency sound pressure sensitivity can be enhanced, and the measuring on the phase of the hydrophone in the coupled cavity can berealized.

The invention provides an optical fiber strain gauge and a high-sensitivity disc-type displacement sensor with an ultra-short base line. The optical fiber strain gauge comprises the displacement sensor, the measurement base line, base line fixing devices, suspension systems, a measurement control and signal recording and processing system and a measurement and calibration device, wherein the displacement sensor is fixed on a first bed rock and is connected with the head end of the measurement base line, the measurement and calibration device is mounted at the tail end of the measurement base line and is fixed on a second bed rock through the base line fixing devices, the suspension systems are mounted in the middle of the measurement base line, and the displacement sensor and the measurement and calibration device are connected with the measurement control and signal recording and processing system through signal connecting lines. The optical fiber strain gauge can be widely used for the geophysical research field of observation of crustal strain and solid tide, seismic precursor information acquisition and the like.

The invention relates to a liquid level measurement method based on magnetic coupling and an optical fiber pair array. The method is characterized in that a stanchion is fixedly arranged in liquid; optical fiber pair linear arrays are arranged in the stanchion; narrow slits which can ensure light to pass are arranged between two optical fibers of each fiber pair; all the narrow slits are communicated to form a narrow slit guide slot; the narrow slit guide slot is internally provided with a magnetic light barrier; a buoy floating on the liquid surface is internally provided with a permanent magnet; the permanent magnet drives the magnetic light barrier to move along the narrow slit guide slot by the magnetic coupling, thus modulating the light flux of the fiber pair; according to differentliquid levels, the light flux of different fiber pairs can be modulated; and the liquid level position can be obtained by detecting the light flux of the fiber pairs. In the invention, the permanent magnet is sealed in the buoy; all the fiber pairs and the magnetic light barriers are sealed in the stanchion; and only the buoy and the stanchion are directly contacted with the liquid; therefore, aslong as the buoy and the stanchion are made of an anti-corrosive material according to the liquid to be detected, the method can be used for measuring the liquid level of any liquid.

The invention relates to a single-frequency polarized laser interferometer and an optical-path-multiplying high-sensitivity laser strain meter. A first single-frequency polarized laser interferometer which is arranged on a first bed rock and a first measurement reflector form an integral single-frequency polarized laser interferometer; the first measurement reflector is connected with a head end of a measurement base line through a calibration and limit device; a reflector limit device is arranged at the tail end of the measurement base line; a second measurement reflector is arranged in the reflector limit device; the second measurement reflector and a second single-frequency polarized laser interferometer which is fixed on a second bed rock form another integral single-frequency polarized laser interferometer; a suspension system is arranged in the middle of the measurement base line; and the first single-frequency polarized laser interferometer, the second single-frequency polarized laser interferometer and the calibration and limit device are connected with a signal recording and processing system through signal connecting wires. The single-frequency polarized laser interferometer and the optical path multiplying high-sensitivity laser strain meter are high in measurement precision and simple in structure, and can be widely used in the field of geophysics research such as observation for crustal strain and solid tide and acquisition of precursor information before earthquakes.

The invention relates to a comprehensive online monitoring method for a capacitor and based on redundant data, and belongs to the technical field of electric power systems. According to the technicalscheme, an information fusion technology is introduced into capacitor online monitoring, redundant information with multiple data sources is fully used, a weight coefficient of each independent algorithm is obtained according to a weighted data fusion algorithm and capacitor acceptance test and routine test data, and a final capacitance value is obtained. The comprehensive online monitoring methodcan be integrated into an existing capacitor protection and measurement and control device, the investment of new equipment is reduced, and the wiring is simplified; when any one sensor fails, an online monitoring system can detect the fault location and issue a sensor fault signal, the measurement of a true capacitance value of the capacitor is not affected, and a capacitor warning signal is notaccidentally sent; and when the capacitor has faults such as fuse blow or capacitor component breakdown, the method can detect the fault location in real time and issue the capacitor warning signal,and high reliability and accuracy are achieved.

The invention provides a near-field microwave measurement system based on impedance measurement. The near-field microwave measurement system comprises a microwave network analysis system, a position device, a near-field microwave impedance sensor and a data processing system. A complex impedance for determining of a near-field microwave impedance sensor is provided; the absolute position for controlling a probe to a measured object is fed back by probe impedance; and material property parameters or surface topography of the measured object are obtained from the impedance and position parameters of the probe. The system can be used to solve the technical problems that substance properties or surface topography of a sample cannot be quantitatively detected by a high-resolution optical testing technology; that a traditional technology for quantitatively testing dielectric parameters in a microwave frequency spectrum is difficult to use in a microscopic system; and that a traditional near-field microwave measurement system needs to modulate and demodulate incident microwave signals, a low-frequency phase-locked loop with the frequency below 100 KHz is used, influence of substance property parameters and the position of the probe relative to the measured object on microwave signals reflected by the measured object is difficult to decouple, the absolute position of the probe away from the measured object cannot be reliably controlled, and the low-frequency phase-locked loop can only be used for narrow-frequency-band measurement.

A method for analyzing gas with tar particles include leading gas to be analyzing into liquid contained in sealed container and dissolving tar particles in gas by said liquid, filtering said gas when it is discharged out from said liquid, sending discharged out gas into analyzer for obtaining parameter of said gas. The device used for realizing said method is also disclosed.