54results about How to "Applicable measurement" patented technology

The invention discloses a method and device for measuring thickness and refractive index of a thin film and an application thereof. The method comprises the following steps of: projecting at least three light beams onto the same point or position on the surface of a thin film sample in different incident angles, receiving intensity of a reflected light beam by an array photoelectric detector, comparing the intensity with the light intensity of an incident light beam, calculating the refractive index of each light beam, and finally fitting with a theoretical formula to obtain the thickness and the refractive index of the thin film to be measured. The device comprises a power supply, a transmission grating, a diaphragm, a condenser lens, a polarizer and a sample rotating platform are sequentially arranged along optical axis; axis of the sample rotating platform is coincided with the axis of a photoelectric detector rotating platform, wherein the diameter of the photoelectric detector rotating platform is more than the diameter of the sample rotating platform; and a photoelectric detector, a signal sampling, amplifying and AD conversion circuit and a computer which are arranged on the photoelectric detector rotating platform are sequentially connected. The method and device disclosed by the invention have the characteristics of fast measuring speed and high spatial resolution, and integrated circuits (IC) and / or functional thin-film devices can be detected in a large scale.

The invention discloses a variable-volume pressure fixing device and method for measuring the solubility of gas in liquid. The variable-volume pressure fixing device includes a gas sample bottle, a gas cavity, a balance cavity, a thermostatic bath with a magnetic stirrer, a pressure sensor, a thermometer, a gas chromatograph, a pressure reducing valve, a pressure control gas cylinder, a vacuum pump and a real-time data acquisition system. The gas cavity is used for controlling and calculating the sample quantity of gas in the balance cavity. The balance cavity is provided with a visual window and a movable piston, the liquid level can be observed, and the pressure inside the balance cavity can be regulated. The constant pressure in the balance cavity is kept by adjusting the movable piston through the pressure control gas cylinder.The method stabilizes the pressure in the balance cavity through the external large-volume gas cylinder, achieves measurement of the solubility of a pure gas substance and a mixture in liquid under constant pressure and can avoid solubility equilibrium offset caused by sampling.

The invention discloses a method for online measurement of MEMS film young modulus based on a resonant frequency method. The method comprises the following steps: making a center fixed round MEMS film with the radius of r0 and the thickness of h, and fixing an anchor zone of the film on a plane substrate; measuring the resonant frequency f of the center fixed round MEMS film by a micro-motion analyzer; and calculating the young modulus E of the film material. In the method, the center fixed round film with symmetrical center is taken as a test structure and the anchor zone is nearly clamped ideally, thus improving the model precision. The tested film structure can not be damaged in the test process by adopting a non-contact resonant frequency measurement method and the film structure has good repeatability. The method is applicable to measuring the young modulus of conducting materials and non-conducting materials. Furthermore, the measurement method also has the advantages of simple operation, high measurement accuracy, small chip area and the like.

The invention relates to a laser beam quality M2 factor real time tester, which is formed by a focusing lens, a grid group, a light path adjuster and a CCD, wherein the output end of the CCD is connected with the computer by signal wire; the focus of the focusing lens is f; the dilemma is D; the grid group is a grid light-dividing system which is formed by two oppressed blocks of grid; the grid light-dividing system can divide a beam laser into 3í‡3 strips light beam groups with isocandela; the light path adjuster includes a lens array which is formed by nine reflecting lenses with the corresponding micro-adjusting screw; the distance from the grid group, the light path adjuster to the receiving side of the CCD of the zero-grade diffracted beam of the focusing lens equals to the focus of the focusing lens.

The invention discloses a contact stress sensor. The contact stress sensor comprises a flexible supporting base, a strainmeter, a flexible transmission line and a flexible medium, wherein the flexible supporting base is provided with a plurality of through holes and located at the bottommost position, the strainmeter and the flexible transmission line adhere to the upper surface of the flexible supporting base after being connected into a whole in a lead bonding mode, and the flexible medium covers and adheres to the upper surface of a combination of the strainmeter and the flexible transmission line. Due to the adoption of the flexible supporting base, the flexible transmission line and the flexible medium, the contact stress sensor is capable of bending and deforming along with changes of installation environments, and particularly applicable to measuring contact stress of an upper contact surface and a lower contact surface of an article located in a curved surface structure; due to the fact that the through holes are formed in the supporting base, the contact stress sensor can be used for measuring not only pulling stress but also compressive stress, and measuring accuracy is enhanced.

The invention relates to a manufacturing method for a quartz comb teeth capacitive accelerometer. The accelerometer comprises an upper cover plate, a lower cover plate and sensitive components. The manufacturing method refers to manufacturing of the sensitive components, manufacturing of the upper cover plate and the lower cover plate and bonding between the upper cover plate and the lower cover plate. According to the method, quartz materials are adopted in manufacturing of the teeth capacitive accelerometer for the first time, the manufacturing method aiming at the specific structure of the accelerometer is innovatively designed, and new purposes of the quartz materials are achieved. The whole structure of the capacitive accelerometer is made of the quartz materials, thermal expansion coefficient is matched with the accelerometer, temperature performance of sensors can be improved, great sensing masses and initial capacitance values can be obtained, sensitivity and resolution of the sensors can be obviously improved, and it is ensured that manufactured comb teeth have large depth-to-width ratios.

The invention relates to a digital liquid level sensor, belonging to the technical field of measurement. The digital liquid level sensor is characterized in that the sensor is an integral throw-in-type digital liquid level sensor with an elastic cavity, the sensor consists of a sensing part, a shell and a transmitter 15, and the sensing part (see attached drawing 1) consists of a rubber molded box 1, a magnetic core 2, a coil 3, a spring 4 and an adjusting screw 5, wherein the rubber molded box 1 is a rubber elastic cavity which can be extended and retracted vertically, and the transmitter 15 and the sensing part are installed together. When being used, the digital liquid level sensor is directly thrown into liquid to be detected and is not required to be installed. Moreover, since the sensor outputs pulse digital signals, the sensor can be directly matched with subsequent digital processing circuits such as a computer, a single-chip microcomputer and the like. The digital liquid level sensor has the advantages of low manufacturing cost, simple range adjustment and convenience in use, is suitable for all fields of industry and agriculture and can be used for measuring the liquid level of all kinds of conductive and nonconductive liquid materials.

The invention relates to a micro-scale charge detonation pressure and detonation velocity test system based on a MEMS pressure-conducted probe. The system comprises an initiation device, wherein the lower end of the initiation device and the upper end of a micro-scale charge body are connected and fixed, the lower end of the micro-scale charge body is fixed to the upper end of an inert medium, andthe lower end of the inert medium is fixedly connected with a bottom plate; the edge of the micro-scale charge body and the inert medium is embedded with the MEMS pressure-conducted probe, and leadsof the MEMS pressure-conducted probes are led out from the interfaces of the inert medium and the bottom plate; the leads, a resistor and a constant voltage source of the MEMS pressure-conducted probeform a current loop; the leads of the MEMS pressure-conducted probe are connected with the input end of an oscilloscope; and the initiation device is connected with an initiator, the initiator is connected with the input end of the oscilloscope through a current ring, and the output end of the oscilloscope is connected with a computer. The MEMS pressure-conducted probe can obtain the explosive detonation velocity and the initial velocity of the medium shockwave at the same time, so that a detonation velocity growth curve and the end face output detonation pressure of the micro-scale charge are calculated and obtained. The system is suitable for measuring the output performance of micro-scale charge, and improves the measuring precision.

The invention provides a measuring spoon which comprises a spoon body, a spoon handle, a temperature sensor, a weight measuring instrument, a temperature sensing piece, a gravity sensing piece, a power supply, a liquid crystal display screen, a control button, a power button and a diode; and the measuring spoon not only can measure the temperature of a substance contained in the spoon body but also can display the weight of the contained substance, so that a user can more precisely know the temperature of the substance on the surface of the spoon body and precisely operate according to the dosage of the substance contained in the spoon body.

The invention proposes a metal-plasmon-patch-type temperature and infrared ray sensor. The surfaces between an upper layer flexible and transparent substrate and a lower layer flexible transparent substrate (5) are provided with a flexible polymer molecule brushing material layer (2) each. The outer end of each flexible polymer molecule brushing material layer (2) is connected with metal nanometer particles (3). The oppositely arrayed two layers of metal nanometer particles (3) and the flexible polymer molecule brushing material layers (2) form a unit structure. The unit structure can be a repetitive and multi-layered one. A flexible transparent film (1) is located around the above structure. Transparent liquid (4) is filled among the flexible polymer molecule brushing material layers (2) and the flexible transparent film (1). A patch (6) is arranged under the flexible transparent film (1) and is closely attached with the flexible transparent film (1). According to the invention, it is possible to directly observe with eyes or to use a camera to photograph the illuminating colors of the patch-type temperature sensor. Therefore, the sensor is suitable for objects with regular and irregular surfaces. With the sensor, a large area can be measured. Anti-electromagnetic interference can be realized. The responding is fast and the cost is low.

The invention discloses an instrument used for measuring withstand voltage and pulse frequency of pulse water switches and a method thereof. According to the instrument and the method thereof, performance of water switches in a pulse power system can be tested, and performance of liquid switches taking high insulation fluids as mediums can be tested. Withstand voltage of water between discharging electrodes in a successive discharging time interval is measured, two high voltage pulse power sources are employed, voltage is applied by one high voltage pulse power source to the electrodes of a discharging reactor so as to make the water generate a discharging plasma channel, vaporization occurs, as bubbles in the water contract, the bubbles disappears. In the process, a time time-delay trigger emits signals, and the pulse voltage is applied by the second high voltage pulse power source to the electrodes so as to make the discharging plasma channel to penetrate the electrodes another time. Insulation restoration ratios of the water switches and pulse frequency characteristics can be tested, stability of the test circuit is good, and the measurement precision is high.

A high-sensitivity and stability composite enzyme functional sensitive film containing Zn-VIA family semiconductor nano-grain, its preparation and use are disclosed. The process is carried out by mixing Zn-VIA family semiconductor nano-sol with oxidizing enzyme solution, adding into polymer gel solution, agitating, adding into glutaric dialdehyde, cross-linking treating, and coating mixed solution onto solid carrier surface to form into composite enzyme functional sensitive film containing Zn-VIA family semiconductor nano-grain. The proportion of polymer Zn-VIA family semiconductor nano-grain is 1:3.26X10-7-1:8.15X10-1, it contains oxidizing enzyme 0.1-120 active units, the grain size of Zn-VIA family semiconductor is 1-200 nm. It saves enzyme usage and has better performances. It can be used for biological sensor, biological separating film and enzyme biological catalytic engineering.

The invention discloses a device for accurately measuring vehicle wheel slip ratio with an aim to overcome the shortcomings that an existing wheel speed measuring device and a vehicle speed sensor cannot accurately measure vehicle wheel speed and wheel hub speed and solve the problem about the lack of a device for directly measuring the vehicle wheel slip ratio. The device comprises a telescopic adjusting mechanism (1), a sensor acquisition processing unit (2), a sensor rotating component (3) and a wheel connecting component (4). The sensor rotating component (3) comprises a rotating shaft (14) and a connecting disc (15); the rotating shaft (14) and the bottom surface of the connecting disc (15) are integrally connected, the lower end of the rotating shaft (14) is rotatably connected with the bottom plate of a device shell (19) in the sensor acquisition processing unit (2), the wheel connecting component (4) is connectively mounted on the connecting disc (15) in a threaded manner, and the right end of a screw D (13) in the telescopic adjusting mechanism (1) is connected with the left side of the device shell (19) in the sensor acquisition processing unit (2) in a welded manner.

The invention discloses an integrated optical fiber gas detection system and an integrated optical fiber gas detection method, which belong to the field of optical fiber gas detection. The integratedoptical fiber gas detection system comprises a signal source driving module, a laser, a temperature control module, a beam splitting device, a reference gas chamber, a first photoelectric detector, asecond photoelectric detector and a signal processing module, wherein the signal source driving module is used for generating continuously varying periodic current; the laser is used for generating initial laser beams with different wavelengths under the driving of currents with different magnitudes; the temperature control module is used for controlling the internal temperature of the laser; theto-be-detected gas absorbs the initial laser beam and outputs a target laser beam; the light splitting device is used for splitting the target laser beam into a laser beam D1 and a laser beam D2 withequal light intensity; a gas with known concentration in the reference gas chamber absorbs the laser beam D2, and outputs a reference laser beam; the first photoelectric detector converts the laser beam D1 into a first electric signal; the second photoelectric detector converts the reference laser beam into a second electric signal; the signal processing module calculates the concentration of a to-be-detected gas according to the first electric signal and the second electric signal. According to the integrated optical fiber gas detection system, the structural integrity of the to-be-detected gas chamber is prevented from being damaged, and the manufacturing process is simple and easy to integrate.

The invention provides a Z-type natural gas moisture real-time measuring device based on in-pipe phase separation. The device mainly consists of a gas-liquid coarse separation system, a two-stage cyclone, a two-stage pipeline type compact gas-liquid separator, a derotator, a gas flowmeter, a temperature sensor, a pressure sensor, a U-shaped liquid collecting pipe, a liquid flowmeter and an ejection type gas-liquid mixer. The measuring method of the device provided by the invention is to achieve complete gas-liquid separation by using the multi-phase flow tube internal phase separation technology, in combination with the gravity separation and by means of multiple separation steps, and then to measure the flow rates of the gas phase and the liquid phase in natural gas moisture by using a single-phase flowmeter. By adoption of the Z-type natural gas moisture real-time measuring device provided by the invention, the separation efficiency of gas and liquid in the moisture can be greatly improved, the gas-liquid measurement accuracy is ensured, meanwhile the volume of a separator is greatly reduced, and the instantaneity of moisture measurement is improved. In addition, the moisture measuring device and method involved in the invention have the advantages of wide applicable flow parameter range, high safety performance and low manufacturing cost, and are very suitable for popularization and application in engineering.

The invention discloses a target type flow sensor and a target type flow meter for measuring quality and flow of steam of a thermal production well, and belongs to the technical field of fluid quality and flow measuring devices. The target flow sensor for measuring quality and flow of the steam of the thermal production well comprises a barrel, a limiting seat and a target guide rod, wherein a fluid inlet is formed in the barrel; the limiting seat is arranged on the inner wall of the barrel; the target guide rod is arranged in the axial direction of the barrel and penetrates in the limiting seat; a target slice is arranged at the front end of the target guide rod; a moving magnetic core is arranged at the rear end of the target guide rod; an elastic element which is positioned on the outer side of the target guide rod is arranged between the moving magnetic core and the limiting eat; a fixed magnetic core inductor which is positioned on the outer side of the moving magnetic core is further arranged in the barrel; the fixed magnetic core inductor and the moving magnetic core form a closed magnetic circuit; fluid can push the target guide rod to move so as to change facing area and inductance value of the moving magnetic core and the fixed magnetic core inductor. The target type flow sensor is in an axial built-in type, occupies small space in the transverse direction, and is suitable for narrow space such as underground space.

The invention discloses a permanent magnet-free omnidirectional SH wave electromagnetic ultrasonic transducer and a design method thereof. The transducer comprises two parts of PCB coils and an insulating layer. One part of the PCB coil is an electromagnetic field coil, is of an annular structure, is used for providing a bias electromagnetic field, and is composed of two layers of coils connectedend to end to form a closed loop. The other part of the PCB coil is a coil used for generating eddy current in a board, and two ends of the coil are respectively connected with an external lead. The insulating layer covers the head and tail ends of the PCB coil and is connected with the wire, and the wire is connected with an external power supply. The transducer can control the size of the generated magnetic field to meet the requirements of different detection conditions according to methods of controlling the size of the power-on current and the like. Because no magnet is needed, the volumeand the weight of the transducer are minimized. The transducer can be made of a PCB (Printed Circuit Board) circuit, can be made into a flexible circuit, and is suitable for measuring a tested piecewith an irregular surface and a tubular test piece.

The invention discloses a crack rotor stiffness coefficient measuring method. According to the method, four measurement positions are arranged around a crack damage position along an axial direction;four strain gauges are evenly attached to each measurement position along a circumferential direction; a strain gauge is attached onto a non-bearing structure made the same material as a rotor and isused for eliminating the temperature effect of the strain gauges; the radius of curvature of the bending of the rotor is calculated according to a relation between strain and radius of curvature undera beam bending condition; the radius of curvature is fitted through adopting a cubic function, so that the radius of curvature of the rotor at the crack position is obtained; the stiffness coefficient of the cracked rotor is calculated according to a relationship between cross-section bending moment and the radius of curvature and anti-bending stiffness; and therefore, the stiffness coefficientsof the rotor at different rotation angles can be measured. With the method of the invention adopted, a basis can be provided for verifying the accuracy of a crack model, and an effective means is alsoprovided for the dynamic modeling of the cracked rotor.

The embodiment of the invention provides an experimental method for measuring a target angle by a radar, which is characterized by comprising the following steps of: 1, erecting the radar, selecting a first line passing through the radar, namely a central axis, and then selecting two marking lines on two sides of the central axis according to a selected included angle and the included angle, wherein the marking lines are used for marking a moving track of a target; 2, performing radar antenna pointing calibration; 3, placing a target on the marking lines, and measuring the angles of the target through the radar; and 4, processing the angle data measured on each angle marking line to obtain a target angle. The measured target angles are averaged, then a antenna main shaft pointing angle is subtracted, and the result is recorded as the final target angle.

The invention discloses an instrument and a method for measuring the volume change of a battery cell, and relates to the field of battery cell measuring. The instrument for measuring the volume changeof the battery cell comprises a shell, a high-precision mechanical sensing system and a measuring end, wherein the measuring end comprises a measuring bracket, a clamp for fixing a to-be-tested battery cell and a container for containing bath foam and the battery cell, the measuring end is connected to the high-precision mechanical sensing system, and a clamp is connected to the measuring bracket. The battery cell is placed on the clamp and immersed in liquid, the buoyancy change of the battery cell is monitored in real time through the high-precision mechanical sensing system, and then the volume change amount of the battery cell is calculated. The instrument can record the volume change of the battery cell in the whole charging and discharging process in situ, so that the accurate gas production volume and gas production rate of the battery cell in each stage can be obtained.

The invention provides a method for optimizing projection modes in image reconstruction based on compression sensing. In the process of reconstructing compressed sensing images, the traditional projection mode usually projects line signals of the image by lines, which resulting in that the row information of the image is wasted, and the sparseness of the image cannot be fully utilized; or, the whole image is pulled into one line signal to be projected, but the projection efficiency is decreased, the complexity in calculation is increased, and the image reconstruction time is prolonged. The method has the advantages that the projection mode is optimized on the basis of traditional single-side line projection, a row and line double-side projection mode with super-low sampling rate is proposed; the sparseness of the global image is fully utilized, the projection efficiency is improved, and the reconstruction accuracy and quality of the image at low sampling rate are improved; especially,under the condition of super-low sampling rate of 1 / 16, compared with the single-side projection mode, the PSNR (peak signal-to-noise ratio) of the reconstructed image of the double-side projection mode is increased by about 4.5dB, and the SSIM (structure similarity) is increased by about 0.1.

The invention provides a detection tool for measuring sediment of a bored pile. The detection tool for measuring the sediment of the bore pile aims to overcome the defects of an existing measuring method for measuring the sediment of the bored pile,. The detection tool for measuring the sediment of the bored pile comprises a measuring rope, a heavy cone block, a flat bottom cover and a probe, wherein the heavy cone block is a hollow cone, a rope ring is arranged inside the heavy cone block, and the rope ring is connected with one end of the measuring rope. The bottom surface of the heavy cone block is provided with a bolt hole, and the bolt hole is communicated with a cavity formed in the inner portion of the heavy cone block. The flat bottom cover is of a structural body shaped like the Chinese character 'tu', and the flat bottom cover is matched with the bolt hole. The probe is a cylinder, and one end of the probe is provided with threads and matched with the bolt hole. The detection tool for measuring the sediment of the bored pile has the advantages of being simple in structure, firm in connection, not prone to damage, long in service circle, capable of accurately measuring the thickness of the sediment of the bored pile and improving the construction quality of the bored pile, simple in detection method, and suitable for being used by small and medium sized projects.

The invention provides a laser light beam uniformity attenuator. The laser light beam uniformity attenuator comprises an attenuation chamber; the attenuation chamber is a hollow seal chamber, diffusereflection surface treatment is applied on the inner wall of the attenuation chamber, and thus a diffuse reflection layer is formed; a sampling in-emit hole and out-emit hole are coaxially formed in the attenuator relative to the two ends, a transmission body capable of highly transmitting a laser light is fixed to the end, close to the out-emit hole, of the inner part of the attenuation chamber,a diffuse reflection film applying high reflectance to the laser light is arranged on the position, directly opposite to the sampling in-emit hole, on the surface of the transmission body, and the diameter of the diffuse reflection film is larger than the diameter of the sampling in-emit hole. The laser light beam uniformity attenuator has characteristics that the structure is compact, processingis convenient, and attenuation coefficient uniformity of different attenuators is good, and the problems that the spatial size of a traditional integrating sphere body is large, and laser light parameter measuring of high spatial resolution cannot be achieved when a two-dimensional array is configured are solved.

Method for analyzing the composition of a bath comprising liquid metal, in which a laser beam is directed onto a surface of the bath and in which at least part of the metal forms a sample which is analyzed, wherein, at least at the location where the laser beam meets the bath, impurities at the surface of the bath are removed by purging with a stream of a purge gas.

The invention provides a method and a system for measuring the mass of a residual propellant of a propulsion system and a medium. The method comprises the steps of: 1, placing a spacecraft on a horizontal plane, and opening a liquid path isolation valve to enable liquid paths of parallel storage tanks to be communicated and balanced; 2, enabling an additional container to be communicated with the propulsion system storage tanks, and measuring the pressure of the air cavities of the propulsion system storage tanks and the pressure of the additional container; 3, injecting a preset volume of gas into the additional container, and measuring the pressure; 4, calculating the volume of the air cavities of the storage tanks; 5, subtracting the volume of the air cavities of the storage tanks from the known total volume of the storage tanks to obtain the residual propellant volume; 6, measuring the temperature of the propellant to obtain the corresponding propellant density; 7, calculating the mass of the residual propellant in the storage tanks; and 8, opening a deflation valve of the additional container for deflation, closing the deflation valve, repeatedly measuring the mass of the residual propellant for multiple times, and taking the root mean square of the measurement results as a final measurement value. The residual propellant amount of the propulsion system can be measured on the premise that the residual propellant is not discharged, and the safety of personnel is guaranteed.

The invention provides full-automatic optical precision measurement equipment which comprises a rack, a light guide plate, a lifting mechanism, a follow-up mechanism, a positioning mechanism, an LED lamp, a mounting plate, a guide rail and a camera, the inner wall of the rack is rotationally connected with conveying rollers through bearings, the outer sides of the two conveying rollers are in transmission connection with a conveying belt, the conveying belt is made of a transparent material, and a first motor is fixed to one side of the rack. In the conveying process of the workpiece, the cameras can follow the workpiece to collect images in a follow-up mode, the working efficiency and the measuring precision are improved, when the two cameras alternately measure the workpiece, the heights and the positions are kept consistent all the time, the measuring precision is further improved, the heights of the cameras can be adjusted, and therefore, the device can be suitable for measurement of workpieces with different heights, and in the process of measuring the workpieces, the conveying belt cannot be suddenly stopped or started, so that the stability of placing the workpieces is improved, and the phenomenon that the higher workpieces topple due to inertia is avoided.

The invention discloses a variable-volume pressure fixing device and method for measuring the solubility of gas in liquid. The variable-volume pressure fixing device includes a gas sample bottle, a gas cavity, a balance cavity, a thermostatic bath with a magnetic stirrer, a pressure sensor, a thermometer, a gas chromatograph, a pressure reducing valve, a pressure control gas cylinder, a vacuum pump and a real-time data acquisition system. The gas cavity is used for controlling and calculating the sample quantity of gas in the balance cavity. The balance cavity is provided with a visual window and a movable piston, the liquid level can be observed, and the pressure inside the balance cavity can be regulated. The constant pressure in the balance cavity is kept by adjusting the movable piston through the pressure control gas cylinder.The method stabilizes the pressure in the balance cavity through the external large-volume gas cylinder, achieves measurement of the solubility of a pure gas substance and a mixture in liquid under constant pressure and can avoid solubility equilibrium offset caused by sampling.

The invention discloses a manufacture method of a raman spectrum test piece. The manufacture method comprises the following steps of: pouring solution containing metal nanoparticles and SiO2 aerosol into a box body by utilizing the injection molding process, wherein the box body is formed in an open mold pressing way; and then forming a raman detection layer at the bottom part of the box body by the volatilized solution. The method is simple in process, low in cost and capable of realizing massive production. The invention also discloses a raman spectrum test method adopting the test piece. The raman spectrum test method comprises the following steps of: pouring liquid to be detected into a test piece box body; radiating an exciting light to the test piece through an optical fiber collimator and a lens, wherein the raman detection layer on the test piece can improve the exciting function of the exciting light to the liquid to be detected; and finally transmitting a raman signal light emitted by the liquid to be detected into a raman spectrometer through the lens and the optical fiber collimator. The method is simple and easy to carry out, high in interference resistance and high in flexibility, and is suitable for being applied to online analysis, real-time detection, detection of trace poisonous and harmful substances, etc.