117results about How to "Solving Measurement Errors" patented technology

The invention relates to a battery voltage detecting device in serially-connected battery pack and a method of the battery voltage detecting device. The device comprises a switch module for selectively connecting a positive pole and a negative pole of any one battery with a first bus and a second bus respectively, a voltage-to-current (V-I) conversion module of which the output end current is in a linear relation with the voltage between the first bus and the second bus, a current-to-voltage (I-V) conversion module for converting a current signal at the output end of the V-I conversion module into a voltage signal in linear relation, an analogue to digital (A / D) converter for acquiring the voltage signal and converting the voltage signal into a digital signal, and a controller for controlling the switch module and processing and displaying the information received from the A / D converter. The circuit of the invention is simple; the implementation cost is reduced, and the detection precision is improved.

The invention discloses a half-sine quasi-static calibration device of a force sensor. The half-sine quasi-static calibration device comprises an oil cylinder (4), hydraulic oil (5), a pressure valve (6), a hydraulic cylinder (8), a heavy hammer (1), a piston (2), a piston adapter (3), a calibrator (9) and a support (7), wherein the piston adapter (3) is in threaded connection with the top of the oil cylinder (4); the piston (2) is placed in the piston adapter (3); the pressure valve (6) is fixedly connected with the oil cylinder (4); the oil outlet of the pressure valve (6) is communicated with the oil inlet of the hydraulic cylinder (8); the calibrator (9) is in bolted connection with the hydraulic cylinder (8); the force sensor to be calibrated is in bolted connection with the calibrator (9); and the heavy hammer (1) is suspended above the piston (2). The heavy hammer (1) strikes the piston (2) to enable the hydraulic cylinder (8) to generate force impulse to act on the force sensor to be calibrated. According to the invention, quasi-static calibration of the force sensor is carried out by utilizing force impulse generated by the device so as to reduce dynamic measurement error.

The invention discloses a light single sideband modulation method. According to the light single sideband modulation method, a light carrier wave is divided into two routes, with regard to one route of the two routes, light intensity modulation of a suppressed even order sideband is conducted at first, then one first-order sideband signal is filtered out from obtained light intensity modulation signals, and finally the one first-order sideband signal which is filtered out is merged with the other route light carrier wave to enable a final light sideband modulation signal to be obtained. The invention further discloses a light single side band modulator, optical device measuring equipment and an optical device measuring method, wherein the light single side band modulator, the optical device measuring equipment and the optical device measuring method adopt the modulation method. The light single sideband modulation method can effectively eliminate influence of second-order sideband of the single sideband signal so as to improve dynamic range of a system. The optical device measuring equipment and the optical device measuring method based on the modulation method can solve the problem of selection of an optical device to be tested and the problem of measuring error caused by the second-order sideband of the sideband signal under the condition of guaranteeing measurement accuracy.

The invention provides an absolute time delay calibration system of inter-satellite link antennas of navigational satellites. The calibration system comprises a reference frequency source, an inter-satellite link transmitter, an inter-satellite link receiver, a time interval counter, a controlling and processing computer, an attenuator, a vector network analyzer and at least three inter-satellitelink antennas to be calibrated. The inter-satellite link antennas to be calibrated are subjected to pair-wise coupling mutually and are formed as a transceiving link together with the inter-satellitelink transmitter, the inter-satellite link receiver, the attenuator and the cables therebetween. The time interval counter measures the time difference between second signals generated by the inter-satellite link transmitter and the inter-satellite link receiver respectively. The controlling and processing computer reads measurement valves of the inter-satellite link receiver and the time interval counter so as to obtain the absolute time delay of each inter-satellite link antenna to be calibrated after data processing. The calibration system provided by the invention adopts test signals which accord with an inter-satellite link transmission signal system; a practical inter-satellite signal transmission time delay can be reflected in the test result, so that the calibration system is higher in measurement precision.

A transistor circuit capable of eliminating influence of component parameter and a temperature sensing apparatus using the same are disclosed in the invention. The temperature sensing apparatus includes a current-producing unit, a switching unit, a current-duplicating unit and a transistor. The temperature sensing apparatus is used to measure ambient temperature utilizing the voltage difference of the base and the emitter of the transistor varied with temperature. The current-duplicating unit duplicates the base current of the transistor and applies the duplicated current to the emitter of the transistor so as to avoid the influence of a component parameter variation of the transistor at different temperatures and to eliminate the measurement error caused by a component parameter difference between different transistors. Therefore, the novel temperature sensing apparatus improves the precision and the accuracy of temperature measurement.

The invention relates to a machine for detecting the tightening degree and the center height of a screw. The machine comprises a work table (1), a torque calibration device (2), a size calibrating device (3), a product vertical conveying mechanism (4), a control system (5), an online laser measurement device (6), a screw sleeve (7), a beam (8), a display screen (9), a screw tightening device (10), a servo locating device (11), a fixed torque sensor (12), a screw automatic aligning device (13) and position sensors (14). The work table (1) is provided with a product clamp, the fixed torque sensor (12) is arranged at the bottom of the product clamp, and the screw tightening device (10) comprises a servo motor, a speed reducer, a dynamic torque sensor and the screw sleeve (7). The control system (5) comprises an input and output unit, a control unit, an analog-digital conversion unit and a servo driver. The machine has the advantages of being high in automation and production efficiency, capable of automatically detecting product parts, and accurate in tightening torque.

A Faraday detection method for removing modulation amplitude and light-intensity variation influences relates to a method for accurately removing measurement errors caused by modulation amplitude and light-intensity variation in the process of measuring light polarization tiny rotating angles by using a Faraday modulator. According to the method, a digital phase-locked amplifier module is adopted to measure primary harmonic signals and secondary harmonic signals in signals to be demodulated, combining light-intensity signals of Faraday modulator incident light, parameters in the primary harmonic signals and related to the modulation amplitude and the incident light light-intensity are removed through resolving, and finally light polarization tiny rotating angles not influenced by modulation amplitude and light-intensity variation are obtained. The Faraday detection method can remove measurement errors caused by modulation amplitude and unstable incident light light-intensity when the Faraday modulator is used for measuring the light polarization tiny rotating angles, remarkably improves long-time measurement accuracy, and can be used in the process of using atomic spin magnetometers, atomic spin gyros and other instruments to accurately measure light polarization tiny rotating angles.

The invention relates to a statistical principle and programmable logic controller (PLC) technology-based method for measuring and calculating discharge amount of a tobacco shred storage cabinet. The method comprises the following steps of: 1) acquiring a plurality of groups of field bottom belt running experimental data to acquire multiple groups of data of bottom belt frequency converter running frequency and bottom belt running speed, and obtaining an equation f(x)=ax+b based on statistical regressive analysis; 2) performing definite integration on the f(x) by using a PLC cyclic interrupt function block so as to obtain the running length of the bottom belt after multiple times of start and stop; 3) calculating the discharge amount of the shred storage cabinet through a function block (FB) in the PLC by using a formula 'shred storage cabinet discharge amount = bottom belt discharge length * cabinet feeding quantity / distribution length during feeding the cabinet'; and 4) performing high and low speed conversion of stub bar / tail during discharging of the shred storage cabinet in the FB of the PLC by using the real-time discharge length of the bottom belt, performing tail stop and starting related control in advance in the next cabinet. Any hardware detection equipment of the storage cabinet is not needed, many disadvantages and measurement errors caused by detection elements are solved, the accuracy of a system is improved, and the cost is reduced.

Disclosed is a resistance detection device used for the opening and closing process of the elevator door in the elevator detection technical field. In the invention, the left connecting device and the right connecting device of a double cantilever beam are arranged between a simultaneous tooth-shaped belt and a hanging plate; the left connecting device and the right connecting device of the double cantilever beam are respectively provided with strain force measurement devices; the strain force measurement devices measure the drive force applied on the connecting devices and send to a dynamic strain meter; the dynamic strain meter amplifies the signal and outputs the signal to a data acquisition card; a rotation encoder is mounted on the shaft of a permanent magnet synchronous motor in the elevator; the position information of the motor shaft is collected and transmitted to the data acquisition card; the computer processes the derivative operation towards the position information of the motor shaft in the data acquisition card to obtain the speed and acceleration values at any position during the opening and closing process; the resistance of the opening and closing of the elevator door is figured out according to the acceleration and drive force values. The resistance detection device in the implementation embodiment has the advantages of high sensitivity, easy calibration, being influenced by the environmental temperature and the humidity slightly and stable output signal.

The invention discloses a three-wire-system thermal resistor measuring circuit. The three-wire-system thermal resistor measuring circuit comprises: a constant current source is connected with a first terminal which is connected with a three-wire-system thermal resistor, for providing excitation for the three-wire-system thermal resistor; the first input end of a signal conditioning module is connected with the constant current source, the second input end of the signal conditioning module is connected with a second terminal which is connected with the three-wire-system thermal resistor, and the third input end of the signal conditioning module is connected with DC bias voltage; and the output end of the signal conditioning module is connected with the input end of an amplification circuit, the output end of the amplification circuit is connected with an A / D sampler, and the voltage of the A / D sampler forms a linear relation with the resistance of the thermal resistor.

The invention, which belongs to the technical field of electrical variable measurement, provides an adaptive-notch-filter-based harmonic wave extraction method. The method comprises: a, collecting a to-be-measured signal by a sampling device to obtain an input signal u(t); and b, carrying out harmonic wave extraction on the input signal u(t) so as to obtain each harmonic instantaneous value . / xh, a fundamental frequency omega 1, a direct current deviation A0, and each harmonic amplitude Ah. With the method, a problem of measurement error occurrence when direct current deviation occurs in the input and the amplitude is changed according to the original adaptive notch filter (ANF) method can be solved. Even though the amplitude and frequency of the input signal are changed suddenly and even the direct-current deviation is added, the fundamental frequency, the direct current deviation, and each harmonic instantaneous value and each harmonic amplitude can be extracted in real time with high precision based on the algorithm.

The invention provides a fluorescence compensation method for a flow cytometer. The fluorescence compensation method comprises the following steps: step (1) performing single positive sample testing; step (2) calculating fluorescence leakage coefficients and fluorescence leakage matrixes of each channel; step (3) calculating the fluorescence leakage matrixes, and according to the fluorescence leakage matrix K<-1>, obtaining a compensation matrix K<-1>; step (4) performing compensation correction; step (5) performing multi-color analysis test: testing samples colored by a multi-color fluorescence dye, and recording the signal amplitude of each detecting channel; step (6) performing fluorescence compensation.

The invention provides a temperature compensation system and a method of hydrogen sensor with palladium nano structure based on quantum transportation, and aims to radically solve the problem of measure errors of sensor because of the temperature change from the physical hardware. A chip a and a chip b, which has the same category of resistance-temperature curve, of hydrogen sensor with palladium nano structure are adopted in the method, and the two chips are respectively connected to the input terminal of a differentiator. In the two chips of hydrogen sensor with palladium nano structure, the chip a of hydrogen sensor with palladium nano structure is exposed to a hydrogen source, and the change of the resistance value comprises two parts: one part is caused by the change of hydrogen pressure or hydrogen concentration and the other part is caused by the change of temperature. The chip b of hydrogen sensor with palladium nano structure is sealed in a shell body and is insulated from the outer gas, the change of the resistance value is solely caused by the change of temperature, and the resistance value of the chip b is used for compensating the drift caused by temperature. The measure error of hydrogen concentration caused by the temperature change can be eliminated after the calculation of the two sensor signal of the two chips by a differentiator.

The invention provides a network measurement method, a device and a system under an internet protocol security (IPsec) mechanism, and relates to the field of wireless communication. The network measurement method, the device and the system under the IPsec mechanism are used for resolving error generated by a network measurement because of the fact that receiving of a business data package is out of order under the IPsec mechanism. The network measurement method under the IPsec mechanism includes the steps: receiving conversation requesting information which comprises the quantity of IPsec data packages and sending time interval information; after a sending port establishing a conversation, receiving the IPsec data packages with measurement information; and conducting an error detection to the received IPsec data packages according to quantity and the sending time interval information in the received measurement information and the conversation requesting information. The network measurement method, the device and the system under the IPsec mechanism are used in the wireless communication.

The invention relates to a temperature compensator of a Hall detection current sensor. The temperature compensator comprises a stabilized voltage source, a constant current source with a Hall element H and a diode D in a same environment with the Hall element H, wherein the diode D is connected between the stabilized voltage source and the constant current source in series, the stabilized voltage source is connected with an anode of the diode D, and the constant current source is connected with a cathode of the diode D. By adoption of the temperature compensator disclosed by the invention, the problem that measurement error of the Hall detection current sensor is affected due to changes in ambient temperature can be solved, the range of accuracy affected due to the change in the temperature when the Hall detection current sensor detects current once is ensured to be within a nominal measurement error range, the using requirements can be met and actual effect is good.

The invention discloses a temperature measuring circuit and method. The temperature measuring circuit is composed of a single-chip microcomputer, a standard resistor RC, a thermistor RT and a capacitor C1. One end of the standard resistor RC is connected with an input-output pin IO1 of the single-chip microcomputer and the other end of the standard resistor RC is connected with a trigger input pin CP1 of the single-chip microcomputer. One end of the thermistor RT is connected with an input-output pin IO2 of the single-chip microcomputer and the other end of the thermistor RT is connected with the trigger input pin CP1 of the single-chip microcomputer. One end of the capacitor C1 is connected with the trigger input pin CP1 of the single-chip microcomputer and the other end is grounded. With the circuit and method, a problem of a measuring error caused by power voltage fluctuation in the traditional measuring method can be solved; and the thermistor carries out charging and discharging only when temperature measurement needs to be carried out, so that a self-heating error caused by long-time current flowing through the thermistor according to the traditional measuring method can be eliminated.

The invention relates to a self-adapting contact probe set, which is characterized in that four probe assemblies with the surrounding centers distributed in 90 degrees are included, wherein each of the probe assemblies comprises probe components and a moving device, and the probe components are arranged on the moving device which can move forward to the center or reset under dynamic function. Each of the probe components comprises a base body, a spring and a probe; wherein the base body is provide with two shoulder holes, and each shoulder hole is internally provided with a probe and a spring. Under the function of the spring, one end of the probe extends out of the shoulder hole. The self-adapting contact probe set can not only finish sample measurement at one time and make sure that the contact force of each set of probe meets standard requirements, but also avoid the change of the equipotential surface of the sample in the rotating detection process. In addition, the self-adapting contact probe set is characterized by convenient use, high measurement accuracy, good data reproduction quality, low requirement of sample processing accuracy, etc.

The invention discloses a determination method for the distortion degree of random waveform. The method comprises the following implementation steps: (1) sampling to acquire random waveform of a known model; (2) sampling the known model by adopting the same sampling velocity, and searching the sampling waveform obtained actually by 'alignment' by using nonlinear least squares fitting algorithm so as to obtain a model sampling sequence of 'alignment'; (3) acquiring am optimal expectation curve of a tested sampling sequence according to the model sampling sequence of 'alignment' obtained according to the search; and (4) calculating according to the obtained tested random waveform sampling sequence and the optimal expectation curve thereof so as to obtain the distortion degree of the tested random waveform. The determination method for the distortion degree of random waveform, which is provided by the invention, is low in operand, is low in testing process requirement, that is, the accurate full period sampling and the like are not required, and the determination method is easy to implement, and can greatly improve the measurement accuracy.

The invention relates to a data acquisition system for an enhanced stress type force sensor, and aims to solve the problem in the prior art that measuring errors of the data acquisition system are caused as the excitation voltage of the enhanced stress type force sensor and the reference voltage of an A / D chip are interfered. The data acquisition system provided by the invention comprises a power supply module, a stress type force sensor, a filter, an A / D converter and a data processor, wherein the power supply module supplies the voltage; the output end of the stress type force sensor is respectively connected with the input end of the filter; the output end of the filter is connected with the input end of the A / D converter; the A / D converter is connected with the data processor; the data processor acquires a coefficient of sensitivity of the sensor; the reference voltages supplied to the stress type force sensor and the A / D converter are the same. The system provided by the invention has the advantage that the coefficient of sensitivity of the sensor has no relation with the excitation voltage of a standard sensor, namely, the coefficient of sensitivity of the sensor is not affected by fluctuation of the excitation voltage of the sensor.

The invention relates to a method of measuring the beam arrival time of a particle accelerator. The method includes the following steps: S1, installing a first cavity type probe in an outlet of an electronic gun to serve as a reference phase cavity, and installing a second cavity type probe in an intersection of an electronic beam and seed laser to serve as a measurement phase cavity; S2, conducting frequency mixing on TM010 mode common mode signals output from the first cavity type probe and TM010 mode common mode signals output from the second cavity type probe, and conducting low-pass filtering and amplification on the signals that have undergone frequency mixing; S3, conducting synchronous digital sampling on the signals obtained in the step S2; and S4, performing digital signal processing on the signals sampled in the step S3 to obtain a beam phase, and obtaining the beam arrival time through calculation of the beam phase. The method solves the problem of attenuation caused by transmission radio frequency signals and the problem of measurement errors caused by indoor and outdoor temperature difference sensitivity, and also solves the problem in phase lock of a local oscillator source.

The invention relates to the technical field of detection of power of xenon lamp-pumped lasers, in particular to an on-line power detection method and an on-line power detection device for a laser. A front laser power detection method is adopted, a power detector is arranged at the front end of a laser output endoscope, and the power of the laser is obtained by detecting the energy of output laser leaked from the back of a 45-degree total reflection mirror between the power detector and the laser output endoscope. The on-line power detection method and the on-line power detection device have the advantages that the detection error is small, the frequency doubled laser can be measured, the on-line power detection method and the on-line power detection device are suitable for the condition that a laser total reflection endoscope is a plano-concave lens, and the normal use of the laser is not influenced in measurement.

The invention is applicable to the technical field of measurement of microwave characteristics of primary semiconductor devices, and provides an on-chip calibrator model and a method of parameter determination in the on-chip calibrator model. The on-chip calibration model comprises a resistor for representing crosstalk of an on-chip calibrator and a capacitor for representing crosstalk of the on-chip calibrator; the resistor representing crosstalk of the on-chip calibrator is connected in series with a circuit formed by elements in an original calibrator model, and one end of the capacitor representing crosstalk of the on-chip calibrator is connected between the resistor representing crosstalk of the on-chip calibrator and one end of the circuit formed by elements in the original calibrator model. And the other end of the capacitor representing crosstalk of the on-chip calibrator is connected to the other end of the circuit formed by the elements in the original calibrator model. According to the on-chip calibration model provided by the embodiment of the invention, the on-chip S parameter test accuracy of the terahertz frequency band can be improved.

The invention discloses an automatic testing method and system of aging characteristics of a crystal oscillator. The method comprises starting a crystal oscillation measuring unit according to configured aging characteristic measuring parameters; according to preset frequency collecting time intervals, generating frequency collecting signals and transmitting the frequency collecting signals to the crystal oscillation measuring unit to collects frequencies of a crystal oscillator to be tested at corresponding time points; receiving the frequencies of the crystal oscillator to be tested at the corresponding time points, which are fed back by the crystal oscillation measuring unit; when determining that the aging characteristic testing of the crystal oscillator to be tested is completed, performing data processing on the received frequencies to obtain the aging characteristics of the crystal oscillator to be tested. The automatic testing method of the aging characteristics of the crystal oscillator enables the aging characteristic testing process of the crystal oscillator to be completed automatically and has the technical advantages of reducing the labor investment, reducing the measuring errors and greatly improving the measuring efficiency.

The invention aims to provide a Brinell hardness indentation diameter measurement auxiliary device which comprises a bottom plate and a measurement microscope, an annular clamp is clamped in an annular groove, the annular groove is fixedly installed on the measurement microscope, the annular clamp is connected with a first horizontal telescopic rod and a second horizontal telescopic rod, and the first horizontal telescopic rod is connected with a first vertical telescopic rod. The end of the first vertical telescopic rod is connected with a first magnetic suction cup, the second horizontal telescopic rod is connected with the second vertical telescopic rod, the end of the second vertical telescopic rod is connected with a second magnetic suction cup, a center round hole is formed in the bottom plate, and the first magnetic suction cup and the second magnetic suction cup are arranged on the bottom plate. According to the invention, the problem that a small-size part with a small Brinell indentation edge reserved space is easy to shake left and right below a measuring microscope base is solved; the problem of relative movement between the measuring microscope and the part caused by artificial and part factors is solved; measurement errors caused by human factors and part materials and size factors are greatly eliminated.

The invention discloses an optical detection system and method for an inner surface of a pipeline. The system simplifies detection for the pipeline and has the characteristics of being low in cost, non-contact, high in precision and easy to operate. According to the method for measuring the pipeline, complexity of calculation is reduced, measuring precision is improved, an LED lighting source is arranged in an object space focal plane of an illuminating objective lens, and after being subjected to beam expanding and shaping by the illuminating objective lens, 555 nm light emitted by the LED lighting source irradiates to transmission-type optical grating evenly in a form of parallel light; by means of an optical system consisting of a projection objective lens and a reflecting mirror a, theoptical grating is clearly projected and imaged on the inner wall of the pipeline; an optical system consisting of an imaging objective lens and a reflecting mirror b performs converging imaging on the inner wall of the pipeline and the optical grating again, and digital images are collected by a CCD camera; morphology of the inner wall of the pipeline can be measured through combination with experimental calibration according to known parameters of the optical systems and the optical grating.

The invention discloses a spherical three-dimensional force measurement piezomagnetic sensor and a three-dimensional force measurement method thereof. The spherical three-dimensional force measurement piezomagnetic sensor comprises a force measurement mechanism, a signal excitation circuit and a signal conditioning circuit, the force measurement mechanism comprises a spherical shell, a force transmission element connected in the three-dimensional orthogonal direction of the inner surface of the spherical shell, and a piezomagnetic element connected with the force transmission element. The piezomagnetic element receives an external force applied to the spherical shell through the force transmission element; after the piezomagnetic element receives the external force, the signal excitation circuit transmits an excitation signal to the piezomagnetic element, so that the piezomagnetic element converts the external force into a non-zero induction voltage and transmits the induction voltage to the signal conditioning circuit; and the signal conditioning circuit performs signal compensation, output decoupling and component force synthesis on the induced voltage to obtain an external force value and a component force value in each direction. Loading force in all directions can be accurately detected, the bias degree of a magnetic field is increased on the basis of equal stress deformation, and therefore the complex working conditions in practical application are met.

The invention provides a double-marble balanced centering type internal dial gauge. The double-marble balanced centering type internal dial gauge comprises a measuring part, an ejector pin part and a master meter, wherein the ejector pin part comprises a main gear, a main shaft, an ejector pin, a volute spring, a lower end cover and a sleeve, the main gear is arranged at the bottom of the main shaft, the ejector pin is arranged between a main shaft sealing cover and the upper end surface of the main shaft, the master meter is fixed at the side end of a fixed ring through a fixed support, the lower end cover is arranged below the volute spring which is fixed below the main gear, the measuring part comprises a lower box, an upper box, two inner measuring rod sleeves and two inner measuring rods, one ends of the inner measuring rods are inserted in through holes of inserting parts of the inner measuring rod sleeves, and the end parts of the two inner measuring rods extend out of the two sides of the lower box and the upper box. The double-marble balanced centering type internal dial gauge has the advantages that the defect of incapability of centering in short time during earlier stage balanced centering is overcome, and a dead zone in a variable orifice is visible, so that whether a dial gauge stand is balanced and centered and whether the measurement state is achieved can be judged through direct visual observation, the measurement time is shortened as much as possible, and the measuring accuracy is improved.

The invention discloses a device for testing axial heat conduction coefficient of a tubular material, which belongs to the field of heat conduction coefficient tests. The device comprises an annular heater which is arranged between the end surfaces of two tubular materials to be tested with the identical material and appearance size, wherein one end, away from the annular heater, of each tubular material to be tested is provided with a heat radiating ring; the annular heater is an annular sheet, and the inner diameter and the outer diameter of the annular heater are identical to those of the tubular material to be tested; the outer walls of two ends of the tubular material to be tested are respectively provided with at least three temperature measuring elements in an adhering manner, and the temperature measuring elements on each end are uniformly distributed along an annular form parallel to the end surface of the tubular material to be tested; the temperature measuring elements are connected with a temperature display instrument through a lead. By adopting the device, the problem for measuring the axial heat conduction coefficient of the tubular material with anisotropy of the heat conduction performance can be solved, and by adopting the method that two samples to be tested are symmetrically distributed, the measurement error problem caused by the heat loss of the heater can be avoided.

The invention creates and provides a silk-screen printing type self-referencing-graphene field effect transistor biochemical sensor. The graphene field effect transistor biochemical sensor is prepared by adopting a silk-screen printing technology, not only has the device advantages of a graphene field effect transistor, but also can meet the requirement for detection on three electrodes of a biochemical sensor in a liquid environment, and is simple in process and low in cost; moreover, the self-referencing structural design is different from an existing liquid gate graphene field effect transistor, adopts a design scheme of integrating a reference electrode and the graphene field effect transistor into one whole body, and has the advantages of all solid state and easiness for operation; and finally, due to adoption of a process of respectively carrying out carboxylation and amination processing on a graphene material and a substrate, the silk-screen printing type self-referencing-graphene field effect transistor biochemical sensor is beneficial for improving stability of a device.