40results about How to "The signal output is stable" patented technology

The invention provides an optical-fiber security early-warning polarization-phase combined control system for the security protection and early warning of buried pipelines, structures or important facilities and regions, which relates to the technical field of mechanical vibration measurement, impact measurement and pipeline systems. A polarization modulator (202) is connected in serial between acontinuous monochromatic laser (101) and a wave combining-dividing device (203); the wave combining-dividing device (203) is connected with two photoelectric detectors (309) and (310) through opticalfiber; the output ends of the two photoelectric detectors (309) and (310) are connected with an A / D (312) and an A / D (313) respectively; the output ends of the A / D (312) and the A / D (313) are connected with photoelectric signal processing circuits (311) respectively; the output end of one photoelectric signal processing circuit (311) is connected with a polarization controller (201); the output end of the polarization controller (201) is connected with the polarization modulator (202) and a phase modulator (206) connected in serial with optical fiber (1) or (2); the output of the other photoelectric signal processing circuit (311) is connected with a phase controller (205); and the output of the phase controller (205) is connected with the phase modulator (206) connected in serial with the optical fiber (1) or (2).

The invention relates to a device and method for detecting nucleic acid by an isothermal amplification technology. The device comprises a sample processor and a magnet-sensitive detector, wherein thesample processor comprises a microflow groove, a temperature controller, a capture chip storage chamber, a DNA modification magnetic bead storage chamber and a cleaning fluid storage chamber; the temperature controller is arranged at the microflow groove; an inlet of the capture chip storage chamber communicates with a reagent outlet of the microflow groove through a first microchannel, communicates with the DNA modification magnetic bead storage chamber through a second microchannel and communicates with the cleaning fluid storage chamber through a third microchannel; valves are arranged on the first microchannel, the second microchannel and the third microchannel; and the magnet-sensitive detector comprises a magnetic sensor and a groove capable of accommodating the capture chip storagechamber, the capture chip storage chamber is inserted in the groove, and the magnetic sensor senses DNA modification magnetic beads in the capture chip storage chamber and converts magnetic signals ofDNA modification magnetic beads into electric signals. The device of the invention is high in response speed and stable in signal output when used for detecting the nucleic acid.

The invention relates to an equivalent-drop height powder impulse flowmeter. The equivalent-drop height powder impulse flowmeter is characterized in that the upper part of a shell of the equivalent-drop height powder impulse flowmeter is provided with a herringbone material guide pipe; the shell is internally provided with a feeder, an equivalent-drop height discharger and a material supporting plate from top to bottom, the feeder is a multi-blade rotating feeder, and multiple blades of the multi-blade rotating feeder are fixed on a rotating shaft by being arrayed at intervals in a conical shape; the equivalent-drop height discharger is composed of a discharging chute and a truncated conical drum positioned in the middle of the discharging chute, the conicity of the truncated conical drum is the same as the array conicity of the blades of the multi-blade rotating feeder, and a group of small discharge holes are respectively arranged in two sector areas which are perpendicular to the central connection line direction of two discharge ports of the herringbone material guide pipe; the material supporting plate is formed into a conical material supporting plate and arranged just below the truncated conical drum through a pressure sensor assembly, the conicity of the conical material supporting plate is the same as that of the truncated conical drum, and central lines of the two conical structures are coincided; and perpendicular discharging heights from the centers of all small discharge holes positioned on the truncated conical drum to the conical material supporting plate are equivalent. The invention solves the problem of low metering accuracy of an impact plate flowmeter.

The invention discloses a single-point perpendicular seismic detector. Two single-lead insulator binding posts are fixed to an upper cover. The lower ends of the single-lead insulator binding posts are welded to conductive lead springs, the lower ends of the conductive lead springs are welded to binding posts in coil rack binding post holes, and the other ends of the binding posts are connected with a leading-out terminal of an upper coil and a leading-out terminal of a lower coil in a welded mode; a coil rack is an integrated piece, the lower end of the coil rack is connected to the outer edge of a lower leaf spring in a pressed mode, the lower end of a lower magnetic shoe is connected to the inner edge of the lower leaf spring in a pressed mode, a boss of a lower cover is sleeved with the lower leaf spring, a groove in the upper end of the coil rack is connected to the outer edge of an upper leaf spring in a pressed mode, the upper end of an upper magnetic shoe is connected to the inner edge of the upper leaf spring in a pressed mode, and a lower boss of the upper cover is sleeved with the upper leaf spring; the upper end of the upper magnetic shoe is higher than the upper end of the upper coil and the lower end of the lower magnetic shoe is lower than the lower end of the lower coil; the deformation direction of a main reinforcing bar of the upper leaf spring and the deformation direction of a main reinforcing bar of the lower leaf spring are respectively anticlockwise. The single-point perpendicular seismic detector is simple in structure, low in cost, high in use reliability, long in service life, narrow in winding, wide in magnetic field, evener in magnetic field and more stable in output, and the number of dropping-resistant times is over 8000.

The present invention provides an engine startup method and a controller thereof. The method utilizes an electric motor to drive an engine to start up; the method also detects the rotation speed of the engine; wherein, when the rotation speed of the engine reaches a first rotation speed and the duration of the rotation speed lasts until a first duration, the fuel injection quantity for the startup of the engine is controlled as L; when the rotation speed of the engine reaches a second rotation speed and the duration of the rotation speed lasts until a second duration, the fuel injection quantity for the startup of the engine is controlled as the first corrected value of L; and when the rotation speed of the engine reaches a third rotation speed and the duration of the rotation speed lastsuntil a third duration, the fuel injection quantity for the startup of the engine is controlled as the second corrected value of L. The adoption of the method and the controller can shorten startup time, in particular cold startup time, improve the startup quality of the engine, decrease the fuel consumption of startup and reduce startup emission.

The invention relates to a flexible strain sensor with strain isolation effect. The strain sensor includes: a flexible substrate, the surface of the flexible substrate is prefabricated with a parallel crack structure or a grid crack structure obtained by stretching by a certain method; a strain isolation layer, the strain isolation layer has a modulus much smaller than that of the substrate an elastomer; a conductive filler coated on the strain isolation layer as a strain response layer; and electrodes at both ends of the strain response layer. The flexible crack strain sensor obtained by the invention can obtain greater stretchability while maintaining higher sensitivity. In addition, in order to adapt to the complex strain conditions of the human body, the substrate provided by the invention has a network crack structure to realize the multi-directional detection function. The invention solves the problem of limited tensile performance when the crack strain sensor has high sensitivity, and cannot adapt to the complex The question of contingencies.

The invention belongs to the technical field of petroleum drilling, and particularly relates to an underground signal receiving and transmitting device. According to the specific technical scheme, the underground signal receiving and transmitting device comprises a receiving part, a control device, a mechanical assembly and a transmitting mechanism; when the underground signal receiving and transmitting device works, the receiving part receives a signal transmitted by a lower-end instrument, the control device processes the received signal, and a motor is controlled to drive a rotating sleeve, so that a mechanical assembly works; and the mechanical assembly drives a mandrel, so that a rotor continuously and regularly rotates. During rotation, continuous pulses are generated due to the change of the open area of the rotor and a stator, the change of pressure waveforms is monitored on the ground, and measurement data are obtained through decoding and calculation; and according to the underground signal receiving and transmitting device, engineering parameters and geological parameters in the directional drilling process can be obtained in real time, so that a well drilling track and drilling parameters are reasonably adjusted, and measurement and control while drilling in the underground directional drilling process are achieved.