71results about How to "Increase the measurable range" patented technology

A flowmeter includes: a transit time method unit having a sensor and a reception signal amplification control unit and a flow rate calculation unit which are connected to the sensor via a sensor selector switch; a pulse Doppler method having a reception signal amplification control unit and an integration calculation unit which are connected to the sensor; a transmission / reception timing control unit common to them; a measurement method selection control unit for controlling switching between the transit time method unit and the pulse Doppler method unit, and parallel operation; and a measurement value output selector switch for selecting the output of the transit time method unit and the pulse Doppler method unit. That is, the single flowmeter can perform flow rate measurement by the transit time method having no restriction on the measurement range as well as by the pulse Doppler method having an upper limit of the measurement range but enabling a highly accurate measurement.

The invention discloses a vehicle device and a method for measuring the space between vehicles, and aims to increase the measurable range of the space between vehicles, further improves the measurement result of the space between vehicles, and enables the security of vehicle in running to be improved. The invention provides the vehicle device including: an image acquiring unit used for acquiring images; a license plate detection unit used for detecting the images and determining the size of the license plate images in the images; and a vehicle space detection unit used for determining the space between the vehicle where the device is mounted and the vehicle which the license plate images belong to according to the size of the license plate images and the actual size of the license plate. The vehicle device and the method are used for measuring the space between vehicles, automatically determining longer space between vehicles, improving the security of vehicle in running, and facilitating the driving operations of a driver.

The present invention discloses a portable two-dimensional following laser measurement device based on a laser distance measuring sensor. The portable two-dimensional following laser measurement device provided by the invention comprises a horizontal mobile assembly, a vertical mobile assembly and a control system assembly; the horizontal mobile assembly includes a horizontal mobile sliding table and a steeping motor driving the horizontal mobile sliding table to do a horizontal movement, wherein a horizontal grating ruler is installed on the horizontal mobile sliding table; the vertical mobile assembly includes a vertical lifting sliding table and the laser distance measuring sensor, the vertical lifting sliding table is fixed on the horizontal mobile sliding table and is driven by the stepping motor to do a vertical movement, and a vertical grating ruler is installed on the vertical lifting sliding table; the laser distance measuring sensor is fixed at the movable end of the vertical lifting sliding table; and the control system assembly is configured to control the movement of the horizontal mobile sliding table and the vertical lifting sliding table, and to process the distance data fed back by the laser distance measuring sensor, the horizontal grating ruler and the vertical grating ruler. According to the invention, the measurement of the flatness is achieved by utilizing the combination of the two-dimensional measuring table and the laser distance measuring sensor, and the portable two-dimensional following laser measurement device based on the laser distance measuring sensor has the advantages of easy operation, large measurement ranges, high precision and the like.

An SPR optical fiber sensor and an SPR sensing device using the same are disclosed. The SPR optical fiber sensor includes: an optical fiber substrate having a sensing area; a first metal layer disposed on the sensing area of the fiber substrate; and a second metal layer which is a gold layer and disposed on the first metal layer. In the present invention, two or more layers of different metals are stacked on the sensing area and thus the SPR measurable range can be promoted to improve the sensitivity and chemical stability of the SPR optical fiber sensor.

The invention discloses a cable cross-core all-shield electronic current transducer. The transducer can use two ends of one secondary winding individually to provide a sampling signal and input the sampling signal into a signal processing circuit on an electronic circuit board; after processing, two output ends of the circuit simultaneously output two sine shaped analog signals, one signal is a measurement signal for current measurement and metering, and the other is a guard signal for current protection control. The cable cross-core all-shield electronic current transducer has both the measurement function and protection function, thereby realizing integration of a measurement current transducer and a protection current transducer, and having excellent performances, low cost, broad applicability, and remarkable economic and technical effects.

An optical displacement gage includes the phase determining unit includes a relative phase deciding unit to decide a relative phase of the frequency component within a range of 360 degrees, an absolute phase computing unit to compute an absolute phase by combining the relative phase based on the decision result by the relative phase deciding unit and the past decision result by the relative phase, and a phase reference updating unit to update a reference point of the absolute phase based on a reset instruction, and the displacement amount deciding unit decides the displacement amount based on the absolute phase.

A three-dimensional shape measurement apparatus includes main pattern illumination parts, main image-capturing parts and a control part. The main pattern illumination parts obliquely illuminate grating pattern light in different directions toward a measurement target. The main image-capturing parts obtain a grating pattern image of the measurement target by receiving reflection light of the grating pattern light illuminated from the main pattern illumination parts and obliquely reflected by the measurement target. The control part produces height data of the measurement target using grating pattern images of the measurement target, or produces height data of the measurement target using image positions of plane images for the measurement target and texture information of the measurement target. The control part employs a grating pattern illuminated on the measurement target as the texture information to produce height data of the measurement target. Thus, a three-dimensional shape may be measured more easily and accurately.

A head-coupled holder for living body optical measurement that securely brings a light irradiation module and a light detection module in close contact with a scalp, and gives the person to be examined no excessive pressure feeling. Each of the light irradiation module and the light detection module includes a contactor having a contact portion that comes in contact with a scalp of the person to be examined at a leading end thereof, and exposes a leading end of a light guide to the contact portion to form the light guide, and a package having a lower portion to which the contactor is attached. The contactor is fixed to the lower portion of the package through an elastic body, and the package is fixed to an inner upper wall of the insertion hole with a series structure of the elastic body and the viscoelastic body.

The invention discloses a method for automatically extracting a center of an out-of-focus blurred centering image of an aspheric optical element. The method includes: taking a gray variance definitionevaluation function as a measurement standard, and obtaining a region of interest with the highest definition in a coarse focusing image, namely a region where the center of a cross reticle is located; selecting the image with the highest SMD2 value of the ROI from the odd number of images acquired at equal step pitch; if the value is smaller than a prior threshold value, performing deblurring processing on the optimally focused image by using a trained IRCNN deep learning model or based on an improved dark channel prior algorithm, then obtaining a connected domain of the cross reticle by using adaptive threshold binaryzation and morphological operation, and solving a maximum inscribed circle of the connected domain, the circle center of the inscribed circle being approximate to the center of the cross reticle. According to the invention, the problem that the center of the centering cross reticle image of the aspheric optical element is difficult to extract due to defocusing blurringcaused by the fact that the aspheric normal aberration is greater than the depth of field of the system is solved.

It is an object of the present invention to provide an immunochromatography method capable of measuring a sample in a low concentration range and a high concentration range by setting the measurable range of the sample much wider than the conventional measurable range. The present invention provides an immunochromatography method, which comprises: spreading a test substance, a first labeling substance modified with a first binding substance that binds to the test substance, and a second labeling substance modified with the first binding substance that binds to the test substance, which are in a mixed state, on an insoluble carrier; and capturing the test substance, the first labeling substance, and / or the second labeling substance at a reaction site on the insoluble carrier having a substance having ability to bind to the first binding substance that binds to the test substance, so as to detect the test substance, wherein the first labeling substance is a labeling substance that causes an amplification reaction, and the second labeling substance is a labeling substance that does not substantially influence on the amplification reaction.

A characteristic determining device is provided which determines fuel injection characteristics of a plurality of fuel injectors for an internal combustion engine. The characteristic determining device includes a pressure sensor and a plurality of pipes each of which connects between the pressure sensor and one of the fuel injectors. The pressure sensor is designed to have a plurality of pressure inputs from the respective fuel injectors through the pipes and outputs a signal indicative of a level of pressure in each of the fuel injectors. The characteristic determining device analyzes the signals from the first pressure sensor to determine the fuel injection characteristics of the respective fuel injectors. These arrangements result in a simplified structure of the characteristic determining device and a decreased manufacturing cost thereof.

The invention discloses a metering control method of a rotor scale feeding device. The method comprises the following steps of dividing the flow setting values into a plurality of grades from low to high according to different scale types and different scale coefficients, setting different values for material amount in the effective weighing range of the rotary wheel of the scale according to different grades of the flow setting values, obtaining the corresponding rotary wheel speed set value according to the flow setting values and the corresponding material amount setting values, and then equally dividing the effective weighing space of the rotary wheel into N virtual fan-shaped spaces, weighing and calculating the materials in each virtual fan-shaped space, and adjusting the opening degree of the feeding hole baffle and the speed of the rotary wheel according to the material amount in each virtual fan-shaped space, and performing real-time monitoring on the material flow. By controlling the speed of the rotary wheel and the opening degree of the material port baffle, the precision and accuracy of material metering can be effectively improved.

A displacement measuring system to measure the displacement of a structural object that includes a transmitter having a signal generator and an antenna wherein the antenna is securable relative to one of a displaced object and a support. The antenna defines a transmitter axis that is parallel to the displacement axis of the object and a centerline that is perpendicular to the displacement axis. The system further includes a first receiver and a second receiver having antennas securable relative to the other of the object and the support. The receiver antennas are positioned along a receiver axis that is parallel to the displacement axis and being spaced along the receiver axis on either side of the center line. The receiver antennas are configured to detect a signal emitted by the transmitter. The system further includes a phase detector to triangulate phase change and calculate object displacement.

A scale has marks whose pitch interval changes along a measurement direction in a manner that can be approximated to a quadratic or higher-order polynomial. A comparing unit calculates a difference between first relative position information and second relative position information per unit displacement in a position where a first displacement detecting unit is arranged. Then, an absolute position computing unit computes an absolute position in the measurement direction with respect to the scale based on absolute position information and the relative position information of at least one of the first relative position information and the second relative position information, and outputs the absolute position.

The invention discloses a method and device for solving velocity ambiguity, a method and device for determining the moving speed of an object and related equipment. The method for determining the moving speed of the object comprises the steps of: carrying out fast Fourier transform processing on sampling signals corresponding to each transmitting antenna on each receiving antenna, and obtaining a phase sequence of the sampling signals; according to a plurality of different directions of arrival and a plurality of different compensation frequencies, determining the phase difference of the sampling signal corresponding to each phase in the phase sequence of the sampling signals relative to reference sampling signals, and obtaining a plurality of phase difference sequences; and carrying out vector operation on the phase difference sequences and the phase sequence of the sampling signals to obtain an energy value corresponding to each phase difference sequence, and determining the moving speed of the object according to a compensation frequency corresponding to the phase difference sequence with the maximum energy value. Therefore, the measurable range of the Doppler frequency of an MIMO radar system can be increased, so that the measurable range of the actually measurable moving speed of the object can be increased, and the accuracy of measuring the moving speed of the object can be improved.

The invention discloses a spatial filtering speed measurer based on a digital micro mirror. The device comprises a light source, a collimating lens, a moving object, a lens, a digital micro mirror device, a focusing lens, a driver circuit, a photoelectric detector, a differential circuit, a signal processing board, a driver circuit, and a PC. The working process of the device is as follows: an image of the object is projected to the digital micro mirror device, and the digital micro mirror device filters incoming light; filtered optical signals are focused and then incident on the photoelectric detector, and the photoelectric detector converts the optical signals into electrical signals; and the signal processing board processes the electrical signals to get the speed of the object. The problem that the spacing of gratings and the number of gratings in the existing spatial filtering speed measurer cannot be adjusted is solved. Moreover, spatial filtering is divided into two groups, and part of interference is eliminated. The invention provides a high-precision spatial filtering speed measurer.

The invention belongs to the field of flexible pressure sensors and particularly relates to a flexible wearable mechanical sensor and a manufacturing method thereof. A carbon nanotube / graphene composite film material for study on a supercapacitor and a battery is used for a stress sensor. Graphene fragments in the carbon nanotube / graphene composite film material are used for forming isolated island conductive regions, carbon nanotubes become bridges connecting the island graphene blocks, and an island bridge structure formed by the two forms a conductive channel between electrodes. Due to thestructural feature, the resistance model of the whole device changes a lot, and good resistance change feature is expressed. The strain coefficient of the flexible wearable mechanical sensor can reachas high as 190, the sensitivity is higher, a high measurable range is reached, a tensile range of 150% can be reached maximally, the device repeatability is strong, the process is simple, and the cost is low.

In an optical tomography system for obtaining a tomographic image of an object to be measured by detecting interference light of the reflected light and the reference light, a controller switches between a first detecting mode in which the interference light is detected at a first wavelength resolution and a second detecting mode in which the interference light is detected at a second wavelength resolution higher than the first wavelength resolution.

The invention belongs to the technical field of accumulated snow depth measurement, and discloses a device and method for accurately monitoring the depth of forest accumulated snow in real time, and the device comprises a mounting frame, and a fine adjustment mechanism and a measurement mechanism which are arranged on the mounting frame; the fine adjustment mechanism is used for adjusting the horizontal state of the measuring mechanism and enabling the measuring mechanism to be parallel to the measured ground; the measuring mechanism comprises two infrared snow depth sensors which are symmetrically arranged, and the two infrared snow depth sensors can independently rotate; a camera which is arranged between the two infrared snow depth sensors and can move between the two infrared snow depth sensors in a reciprocating mode, and the moving direction of the camera is perpendicular to rotating shafts of the infrared snow depth sensors; in conclusion, when the infrared light spots formed by the two infrared snow depth sensors on the surface of accumulated snow coincide, snow depth calculation is executed, so that the whole snow depth monitoring is not affected by the sensor installation angle, and the snow depth monitoring precision is improved.

The invention relates to a microwave sensitive online detect method and a relative detector on the cane juice crystallization super-saturation degree. The invention uses a cane juice saturation sensitive inductance winding in 8-shape or dual-6 shape to connect a microwave signal excite circuit, wherein the winding can change resistance along with the capacitor and inductance change of around medium, to change the microwave frequency generated by the microwave signal excite circuit. The excite circuit is compacted with the outer wall of a boiling pan, to check the change of microwave frequency, to obtain the super-saturation of cane juice. The detector comprises a microwave signal excite circuit, a microwave frequency check and voltage convert circuit, a microprocessor, a power supply and a display. The microprocessor stores the relation between the microwave frequency electric parameter signal and cane juice crystallization saturation, to directly output the cane juice crystallization super saturation degree according to the microwave frequency. The inventive method and the detector can non-contact detect the cane juice un-saturation degree in the boiling pan, with simple application, strong interference resistance, high measurement accuracy and wide measuring range.

The invention discloses a large-dip-angle free-form surface measurement method and device based on reference plane comparison measurement, and belongs to the technical field of optical precision detection. A high-precision horizontal plane optical flat is used as the reference standard of an X-Y plane so that the straightness errors of the two guide rails in the height direction are removed. Meanwhile the plane optical plane is used for monitoring the transverse micro-displacement of the X guide rail and the Y guide rail so that the transverse straightness errors of the two guide rails are removed. A sensor for monitoring a reference plane and a sensor for measuring height information of a free-form surface are coaxially mounted, so that abbe errors caused by inclination of a guide rail and a truss are reduced; straightness errors of the X-direction air floatation guide rail and the Y-direction air floatation guide rail are compensated through the reference datum plane, and dimension reduction error separation of free-form surface high-precision measurement is achieved. The nano-precision free-form surface sensor provides a high-precision three-dimensional linear positioning and scanning measurement means for free-form surface detection by utilizing an air floatation rotating shaft to widen the test range and combining a macro-micro cross-scale nano-precision undisturbed driving and positioning method of a residual air recovery type air floatation guide rail.

The invention, which belongs to the technical field of neutron energy spectrum measurement, provides a neutron energy spectrum measuring system comprising a bracket, neutron detectors and N sphericalcavities sleeved layer by layer from the outside to the inside. The N is an integer greater than or equal to 2. The bracket includes a support base and a load-bearing column connected to the support base. The end portion of the load-bearing column extends into the geometric centers of the spherical cavities and is fixed with the cavity of the Nth spherical cavity; and the load-bearing column is connected with N-1 spherical cavities except the Nth spherical cavity. Each spherical cavity is formed by splicing of at least one sub cavity; and the adjacent sub cavities forming one same spherical cavity are fixed. The neutron detectors include a first neutron detector and / or second neutron detectors; the first neutron detector is arranged at the geometric center of the Nth spherical cavity; anda plurality of second neutron detectors are arranged and are distributed in a circumferential distribution of any spherical cavity. Therefore, the diversified detection demands can be satisfied; the detection equipment is highly integrated; the portability is high; and the application range is wide.

A water level monitoring system includes at least one floating unit, a load cell and a sensor module. The floating unit is used for sinking in water. The load cell is connected to the floating unit for generating a force value reflecting buoyancy generating from the floating unit entering the water. The sensor module is connected to the load cell for sensing the force value from the load cell and includes an amplifier for amplifying a sensed value. A processor connected to the amplifier receives the sensed value from the amplifier and calculating a water level depth to be measured. Thus the water level motoring system has features of low cost, high stability and flexibility.