43 results about "Absolute measurement" patented technology

The invention provides a dual-mode gravitational acceleration precision measurement system and method based on a light floating effect. According to the system, a 1064nm laser double-beam correlation structure is adopted, a strong focusing light trap is formed in a gravity orthogonal direction, and micron-sized silicon dioxide particles are stably captured. In the absolute measurement mode, the acousto-optic modulator is used for controlling the on-off of the laser, the high-speed position detection module is used for detecting and recording the free falling motion trail of the particles and the displacement amplitude showing the resonance state after re-capturing, and the absolute gravitational acceleration parameter is inverted. In a relative measurement mode, weak focusing 532nm laser is configured along the gravity direction to construct a gravity compensation light trap, and after absolute gravitational acceleration reference measurement is completed, the laser is modulated by an acoustic optical modulator to accurately balance the gravity of particles, so that the particles enter a quasi-balance state. When the external gravitational field changes slightly, the characteristic displacement of the particles in the gravity direction is extracted, and the change of the relative gravitational acceleration can be monitored continuously.

The present invention relates to a detection device for the diffraction effect correction coefficient of a solar irradiance absolute radiometer, comprising a solar simulation light source, an aperture diaphragm, a lens, a light shielding disc and a light intensity detector; the solar simulation light source illuminates the aperture diaphragm to form geometric light and diffracted light; the focal length of the lens is f, the aperture diaphragm is located at a position of 2f on the object side of the lens, and the light intensity detector is located at a position greater than 2f on the image side of the lens; the light shielding disc can be selectively located at a position of f away from the lens on the image side of the lens. The present invention also provides a detection method for the diffraction effect correction coefficient of a solar irradiance absolute radiometer, which obtains the diffraction effect correction coefficient by using experimental detection means, greatly improving the absolute measurement accuracy of the solar irradiance absolute radiometer.

The invention relates to a high-reflection optical element transmittance and forward and backward scattering absolute measurement method based on an annular cavity optical cavity ring-down technology. A multi-channel cavity ring-down technology is utilized to synchronously measure cavity ring-down signals transmitted by the cavity mirror with known transmittance in the annular cavity, transmitted by the high-reflection optical element to be measured, and forwards scattered and backwards scattered by the high-reflection optical element to be measured within a certain solid angle. And when the ring-down time of the four paths of optical cavity ring-down signals is consistent, calculating the transmittance of the to-be-measured high-reflection optical element and the scattering values of the to-be-measured high-reflection optical element in a certain solid angle in the forward direction and the backward direction in the annular cavity through the ratio of the amplitude of the optical cavity ring-down signals of the three paths of to-be-measured high-reflection optical element to the amplitude of the transmission signal of the cavity mirror and the transmittance of the cavity mirror. According to an optical element surface scattering distribution vector theoretical model, forward scattering and backward scattering values in any collection angle range in the light beam center direction can be calculated through forward and backward scattering experiment measurement curves in different solid angles.

This invention discloses an absolute measurement device and method for the second-order term of the surface shape of an X-ray plane mirror. The device includes a clamping platform, an interferometer, and a rotating stage. The rotating stage has a rotatable mounting platform for the mirror under test and a reference mirror mounting plate. The mounting platform is positioned in front of the interferometer's plane lens to fix the X-ray plane mirror under test. The reference mirror mounting plate has a mounting platform for a reference mirror, on which a reference plane mirror is mounted. The reference plane mirror reflects the light reflected from the X-ray plane mirror under test back to the interferometer's plane lens to measure the surface shape of the mirror. This invention aims to achieve high-precision absolute measurement of the second-order term surface shape of an X-ray plane mirror, improve measurement accuracy, and provide guiding surface shape measurement results for the manufacturing of high-precision X-ray plane mirrors.

The application relates to a super-large-span four-cable suspension bridge steel beam image positioning device and method, and belongs to the technical field of bridge construction measurement. The super-large-span four-cable suspension bridge steel beam image positioning device and method comprises a measurement camera, the measurement camera is used for photogrammetry on a segment ring of a steel beam to be installed, a prism is used for forming absolute coordinates of the measurement camera, a two-way inclinometer is used for measuring the inclination of a convex head and transmitting, a base is arranged on the measurement camera and connected with the two-way inclinometer, one side of the base is connected with a cable and the other side is connected with the measurement camera, so that the measurement mechanism can measure on the cable; the total station and the measurement camera are cooperated and synchronously measured, relative data of a transient image is converted into absolute image coordinates, a large number of measurement points obtain transient absolute measurement coordinates, the defects of conventional measurement on absolute precise positioning of a long and large steel beam are overcome, and the positioning measurement of the super-large-span four-cable suspension bridge steel beam is realized.

The present invention provides a method for obtaining continuous magnetic declination. First, a first geomagnetic theodolite is set up in the target area, and the voltage-time series data is stored in real time through a continuous data acquisition board. Then, the initial reading of the horizontal dial is set, the horizontal dial is finely adjusted and left stationary after fine adjustment, and the difference between the reading after each fine adjustment and the initial reading, the corresponding voltage value, and the corresponding time before and after fine adjustment and stationary are recorded. The magnetic declination grid value is calculated, and the continuous magnetic declination sequence data is calculated and generated. Finally, the second geomagnetic theodolite set up in the target area is used for absolute measurement of magnetic declination, and the generated magnetic declination sequence data is calibrated according to the measurement results. The present invention collects the voltage signal that can represent the magnetic signal and calibrates it through the measured data. The calibrated continuous magnetic declination data obtained can accurately reflect the magnetic declination value at any time, successfully solving the current situation of difficult or inaccurate acquisition of magnetic declination diurnal variation information due to the shortage of geomagnetic stations.

The invention discloses an absolute measurement method and device for the density of molten salt and solution, and belongs to the field of molten salt physical property tests.The measurement method comprises the steps that 1, a cone and cylinder composite heavy hammer is adopted to measure the density of the molten salt or solution; 2) arranging two measuring positions on the cylinder section of the heavy punch, taking the section between the two measuring positions as a middle measuring section, the length of the middle measuring section is equal to the distance between the two measuring positions, the diameter of the middle measuring section is equal to the diameter of the cylinder of the heavy punch, and measuring at the two positions in sequence; (3) the density of the fused salt or the solution is determined by the volume of the middle measuring section of the heavy hammer and the buoyancy borne by the middle measuring section, so that the density of the fused salt and the solution is deduced; according to the method, a long-distance microscope system is adopted to directly measure the thermal expansion of the heavy hammer at high temperature, calibration by a standard substance is not needed any more, when the method is adopted to measure the density of the fused salt and the solution, the volume of the heavy hammer does not need to be calibrated, additional force caused by surface tension is completely removed, the measurement process is greatly simplified, and the measurement precision is improved.

The invention belongs to the technical field of precise optical measurement, particularly relates to a method and a device for measuring the curvature radius of a nano-precision aspherical lens, and provides the following scheme aiming at the problems that the curvature is calculated indirectly through rise in the existing process of measuring the curvature radius of the aspherical lens, the process is easily interfered by errors, and the measurement accuracy is influenced. The method comprises the following steps: S1, clamping a to-be-measured lens, and adjusting an optical axis; s2, moving a to-be-measured lens to a focus of a fixed measurement light path, and carrying out concurrent alignment; s3, a Gaussian measurement light beam is emitted and received; s4, planning a virtual spherical surface, and performing virtual sphere center space scanning; according to the method, error amplification is fundamentally avoided through a direct measurement principle of virtual sphere center scanning and wavefront matching, so that nano-precision and absolute measurement of curvature radiuses at any point of various aspheric lenses is realized, a whole-situation surface shape can be further inverted through multi-point and multi-parameter measurement, and the measurement precision is improved.

The application discloses a kind of data processing methods of dynamic gravity vector horizontal component measurement of strapdown, belong to dynamic gravity measurement technical field.The application shields the influence of horizontal accelerometer measurement error and horizontal gravity disturbance to horizontal attitude solution using Gyros / GNSS attitude solution method, it is a kind of data processing methods of dynamic gravity vector horizontal component measurement of strapdown, which realizes the closed-loop coupling error decoupling of horizontal gravity disturbance.The low-frequency trend error of horizontal gravity disturbance of effective measuring line is corrected in the application endpoint and slope;Endpoint correction and slope correction need to use the true value of horizontal gravity disturbance of two endpoints of effective measuring line as reference point, and effective measuring line refers to the effective data segment left after discarding the larger result of measuring error at both ends of measuring line.The application solves the problem of unknown measurement target affecting measurement result, makes the complex error coupling situation simple and clear;The low-frequency trend error of horizontal gravity disturbance is corrected using the true value of horizontal gravity disturbance of two endpoints of effective measuring line as reference point, and the absolute measurement of dynamic gravity vector horizontal component of strapdown is realized.

The invention relates to a three-dimensional detection system and method for the inner wall of a cylindrical workpiece. According to the three-dimensional detection system for the inner wall of the cylindrical workpiece, precise annular calibration scales are circumferentially arranged on the inner wall of a standard circular tube jig; the line laser sensor is mounted in a manner of forming a fixed inclination angle relative to the rotation axis of the standard circular tube jig, and the scanning range of the line laser sensor can simultaneously cover the inner wall of a to-be-measured workpiece placed in the jig and the scale area of the inner wall of the jig; the rotation driving device is used for driving the standard circular tube jig and a to-be-detected workpiece arranged in the standard circular tube jig to rotate around the rotation axis together; according to the three-dimensional detection method for the inner wall of the cylindrical workpiece, XY-axis physical adjustment is replaced with scales as a calibration mode, distortion correction of a laser image is completed through data compensation, scanning data of the workpiece and a standard circular tube jig are subjected to synchronous registration in a three-dimensional space, absolute measurement is converted into relative measurement, and therefore system errors are eliminated automatically.

The application belongs to the technical field of electric digital data processing, and discloses a fault test method of a Flexray bus, which comprises the following steps: in a non-data transmission state of a bus network, injecting, by an excitation node, a sub-threshold electric excitation pulse which appears as noise to a communication controller; measuring, by the excitation node itself, a local echo of the pulse to obtain a real-time probe fingerprint, and meanwhile, measuring, by a listening node, a far-end response signal of the pulse; finally, performing normalization processing on the far-end response signal by using the real-time probe fingerprint, and comparing the normalized far-end response signal with a reference feature to determine whether the bus has a potential fault, wherein the application establishes a dynamic self-calibration measurement reference, solves the diagnostic confusion problem caused by state fluctuation of an excitation source itself, changes the nature of fault test from relative comparison to quasi-absolute measurement which can resist signal source drift, and improves the confidence and reliability of online diagnosis of unattended transaction equipment.

The application provides a large-range absolute direction discrimination macro-micro collaborative grating displacement encoder, which comprises a light source, a photoelectric detector, a grating and a mask, the grating is a hybrid grating, the hybrid grating comprises a grating area and an encoding area, a group of encoding one is arranged on the encoding area, and a group of encoding two is arranged on the mask; the group of encoding one comprises at least two layers, the first layer is nanoscale positioning encoding, the second layer and subsequent layers are direction discrimination positioning encoding, and the direction discrimination positioning encoding is used for increasing a direction discrimination range; the group of encoding two comprises encoding corresponding to the layers of the group of encoding one, and also comprises the same nanoscale positioning encoding arranged on the first layer and the direction discrimination positioning encoding arranged on the second layer and subsequent layers. The application can guide the motion direction in a large range to find an absolute mark, complete the design of an absolute measurement light path, and realize the pose monitoring and correction of a synthetic aperture optical system.

The invention relates to a VR equipment observability enhancement method based on relative-absolute state estimation, a medium and application, and the method comprises the steps: defining a coupled head display state and a controller state, and building a continuous time dynamic model based on an IMU; constructing an overall measurement model based on an absolute measurement model of the head-mounted display and a relative measurement model between the head-mounted display and the controller; a relative-absolute state estimation problem is constructed and solved, and state estimation of the head-mounted display and the controller is obtained through joint optimization; based on relative-absolute state estimation, VR equipment observability enhancement is realized by utilizing kinematics constraints among equipment provided by a relative measurement model; when the method is applied to the condition that the head-mounted display is lack of visual absolute measurement, the accelerometer deviation is also observed through the state correlation with the controller; media are implemented based on the method. According to the method, the stability and availability of head-mounted display absolute pose estimation are maintained in a time period lacking visual absolute reference, and the long-term precision and stability of inertial navigation are fundamentally improved.

The invention discloses a laser tracking measurement device and method based on double optical combs, and the device comprises a rough measurement laser light source, a double optical comb light source, an indication light source, a tracking control module, an angle measurement module, and a signal collection and processing module. When the light beam is aligned with the center of a measured target, the double-optical-comb combined distance measuring light path is combined to output a unified measuring light beam to be incident on the measured target; a measured target is reflected back to the double-optical-comb combined ranging light path along the original path to form a measured signal, the signal acquisition and processing module processes the measured signal, the absolute distance measurement of the measured target is realized by fusing coarse and fine ranging, and a space coordinate measurement result of the measured target is calculated by combining an angle value. Therefore, space coordinate absolute measurement with a large non-fuzzy range, high precision and high speed measurement can be realized.

A measuring instrument includes a movable portion configured to rotate in an arc motion about a pivot portion, and an electronic position encoder configured to measure an absolute relative position between a detector portion and a scale portion, one of which forms part of the movable portion. A maximum movement range of the movable encoder portion and a maximum absolute measurement range are each less than 360 degrees. Based at least in part on detector signals that are received from the detector portion, an offset value is determined that corresponds to a radial offset (e.g., of the scale portion or the detector portion). The determined offset value is utilized to correct one or more values that are utilized to determine a relative position between the detector portion and the scale portion (e.g., such as a value corresponding to a spatial step or other spatial value of the scale portion).

The invention discloses an FP sensor demodulation system and method based on a double-optical-comb spectrum technology, and belongs to the field of double-optical-comb precision measurement. In order to overcome the defects in the prior art, the FP sensor demodulation system based on the double-optical-comb spectrum technology is provided, a broadband optical frequency comb light source is used for detecting an FP sensor, a high-speed and high-resolution double-optical-comb spectrum detection method is combined, and high-resolution mapping of an FP sensor interference spectrum in a radio frequency domain is achieved. And absolute measurement and dynamic tracking of the cavity length of the FP sensor are realized by using a high-precision frequency domain demodulation algorithm, so that the limitation of the traditional FP demodulation technology in the aspects of demodulation resolution, demodulation speed and system stability is broken through, and a new technical scheme is provided for multiplexing sensing application of the high-precision and quasi-distributed FP sensor.

The invention provides a distributed robust belief propagation method and equipment with odometer pre-integration for multi-robot cooperative positioning, and belongs to the technical field of multi-robot cooperative positioning. The method comprises the following steps: firstly, providing a speedometer pre-integration measurement model, and calculating a message from a speedometer pre-integration factor node based on the speedometer pre-integration measurement model; secondly, modeling the probability density of external measurement factor nodes into a student t distribution method, deriving an improved measurement noise covariance matrix by using variational inference, and calculating messages from absolute measurement and relative measurement factor nodes based on the improved measurement noise covariance matrix; and finally, carrying out iterative updating on belief of all variable nodes in the sliding window by utilizing messages from a speedometer pre-integration factor node, an absolute measurement factor node and a relative measurement factor node. According to the distributed robust belief propagation method with odometer pre-integration provided by the invention, the influence of measurement nonlinearity and measurement outliers can be remarkably reduced, the precision of pose estimation is improved, and the distributed robust belief propagation method has practical engineering application significance.

Disclosed is a measuring instrument having an arcuate motion and a correction process, comprising: a movable portion configured to rotate in an arcuate motion about a pivot portion; and an electronic position encoder configured to measure an absolute relative position between the detector portion and the scale portion, one of the detector portion and the scale portion forming part of the movable portion. The maximum movement range and the maximum absolute measurement range of the movable encoder part are both smaller than 360 degrees. An offset value corresponding to a radial offset (e.g., of the scale portion or the detector portion) is determined based at least in part on a detector signal received from the detector portion. The determined offset value is utilized to correct one or more values that are used to determine a relative position between the detector portion and the scale portion (e.g., a value corresponding to a spatial step of the scale portion or other spatial value).

The invention discloses a collaborative navigation method and device based on MATLAB (matrix laboratory) system objects, and relates to the technical field of navigation, the method comprises the following steps: S1, creating SdInertNavInt objects; s2, a KalmFilt object is created; s3, a CoopNavNode object is created; s4, creating a CoopNavCluster object, and formulating an information interaction strategy between the nodes; and S5, externally calling a CoopNavCluster.step through () function to operate an intra-cluster collaborative navigation algorithm. According to the invention, the coupling degree between the modules is reduced, and multi-node parallel collaborative navigation calculation is facilitated. The architecture can be compatible with master-slave collaborative navigation and parallel collaborative navigation, can be compatible with centralized filtering and distributed filtering, and can be compatible with absolute measurement and relative measurement.

The invention discloses a single-energy neutron fluence rate absolute measurement device based on a 6LiF telescope system, and belongs to the technical field of neutron detection, the single-energy neutron fluence rate absolute measurement device comprises a cylinder, a collimation diaphragm is arranged in the cylinder, the collimation diaphragm comprises a first center hole and a second center hole, the first center hole and the second center hole are coaxially arranged and have the same diameter, and the first center hole is communicated with the second center hole. A first center hole is formed in one end of the cylinder, a composite layered neutron conversion body is mounted at the first center hole and comprises an aluminum substrate, a 6LiF active layer is evaporated on the upper surface of the aluminum substrate, a passivation ion implantation planar silicon detector is arranged behind a second center hole and is provided with an SMA connector, and a rear cover is arranged at the other end of the cylinder. The center of the rear cover is provided with a BNC female base leading-out signal line. Based on the structural design of the invention, the absolute measurement of the single-energy neutron fluence rate in the energy region from 1 keV to 100 keV can be realized. The method can be used for establishing the reference research of the single-energy neutron fluence rate in the energy region from 1 keV to 100 keV, and the traceability and accuracy of the measurement result of the single-energy neutron fluence rate are ensured.

The invention provides a device for measuring the flow velocity in a natural circulation process, and the device comprises a circulating water system which is connected with a reactor to form a complete closed loop, and is used for simulating a natural circulation loop of a passive containment cooling system of a nuclear power station; the tachymeter system is used for measuring the flow velocity of the fluid in the circulating water system to obtain high-resolution three-dimensional velocity measurement; and the data acquisition system is connected with the tachymeter system and is used for converting the physical signals into fluid mechanics parameters. According to the invention, the measurement precision is high, the spatial resolution can reach micron to millimeter magnitude, the time resolution can reach microsecond magnitude, and the instantaneous characteristics of low flow velocity and high turbulence in natural circulation can be accurately captured. Laser Doppler velocity measurement is an absolute measurement method based on light wave frequency, the result does not need field calibration, and the reliability is high.

Analytical device and analytical process, set up for internal referencing which is independent from the kind of optical response of a sample. The device comprises a light source directed to a sample location, a photon counting detector set up to receive light emanating from the sample location and to generate photon counts, an integrator coupled to the detector and set up to receive photon counts from the detector and to integrate the photon counts over an integration time to generate integrated measurement signals, and coupled to the integrator an analogue-to-digital converter set up to receive the integrated measurement signals and to generate digital measurement signals for each of the integrated measurement signals and to deliver the digital measurement signals to a control unit, which is set up for deconvolution of the digital measurement signals in order to determine correction functions, wherein the control unit is set up to convert separately determined digital measurement signals which are determined for samples in dependence on the correction functions.

The utility model belongs to the technical field of length measuring tools, and particularly relates to a portable absolute type large-scale length measuring device, which comprises a grating ruler and a guide rail base, the grating ruler comprises a scale grating, a grating reading head and a display which are matched with each other, and the guide rail base is provided with a linear guide rail. A linear guide rail is arranged on the guide rail base, a movable measuring seat is arranged on the linear guide rail, a fixed measuring seat is arranged on the guide rail base, a scale grating is arranged on the guide rail base or the linear guide rail, and a grating reading head is arranged on the movable measuring seat. Therefore, the grating ruler is used for measuring the length, the measurement precision is high, the use requirement of high-precision measurement can be met through absolute measurement, and high-precision measurement is more convenient.

This invention discloses an absolute planar two-dimensional time-grating displacement sensor and measurement method using photoelectric combined measurement, belonging to the field of precision measurement and sensing technology. It includes a sensor body, a signal acquisition module, a hardware circuit module, and a digital signal processing module. The signal acquisition module is used to acquire displacement signals generated by electric field measurement and positioning signals generated by optical field measurement. The hardware circuit module is used to process the optical field positioning signal and the electric field displacement signal. The digital signal processing module is used to obtain the positioning value and the precisely measured displacement values ​​in the X and Y directions based on the signal processed by the hardware circuit module. The combination of these two values ​​outputs the absolute displacement value. This invention employs photoelectric combined measurement, using time-division image positioning and electric field displacement measurement. The combination of these two methods enables planar two-dimensional absolute displacement measurement, reducing random errors, improving measurement accuracy, and achieving high-precision absolute measurement over a large range.

The invention provides a spherical two-position absolute surface shape measurement method, and belongs to the field of high-precision interference measurement. According to the spherical surface two-position absolute surface shape measurement method, on the basis of the existing spherical surface three-time interference method measurement, spherical surface two-position absolute measurement in a confocal position rotation step is removed, and a wave surface returned by a to-be-measured spherical surface at a cat eye position is a wave surface obtained after a spherical wave of a standard spherical mirror is rotated by 180 degrees relative to an optical axis. And after the result of interference measurement of the two positions is rewritten by using the parity about theta in the polynomial formula of the circular function, the absolute surface shape of the spherical surface to be measured is further solved. Compared with a spherical surface cubic interference method in the prior art, the spherical surface two-position absolute surface shape measuring method has the following beneficial effects that (1) the operation is simple and convenient; (2) the measurement efficiency is higher; and (3) maladjustment errors caused by rotation measurement of a confocal position in the prior art are not introduced, and the precision of absolute measurement is further improved.

This invention discloses a method based on 6 The monoenergetic neutron fluence absolute measurement device for the LiF telescope system, belonging to the field of neutron detection technology, includes a cylindrical body. A collimating aperture is installed inside the cylinder, comprising a first central aperture and a second central aperture. The first and second central apertures are coaxially aligned and have the same diameter. A composite layered neutron converter is installed at the first central aperture. The composite layered neutron converter includes an aluminum substrate, and the upper surface of the aluminum substrate is coated with a... 6 A passivated ion-implanted planar silicon detector is positioned behind the second central hole of the LiF active layer. This detector is equipped with an SMA connector. A rear cover is located at the other end of the casing, with a BNC female connector at its center leading out signal lines. Based on this structural design, absolute measurement of monoenergetic neutron fluence in the energy range of 1 keV to 100 keV can be achieved. This contributes to establishing a benchmark study of monoenergetic neutron fluence in the 1 keV to 100 keV energy range, ensuring the traceability and accuracy of monoenergetic neutron fluence measurement results.

A measuring instrument includes a movable section configured to rotate in an arcuate motion about a pivot section, and an electronic position encoder configured to measure an absolute relative position between a detector section and a scale section, one of which forms a part of the movable section. A maximum range of motion of the movable encoder section and a maximum absolute measurement range are each less than 360 degrees. An offset value is determined based at least in part on detector signals received from the detector section corresponding to a radial offset (e.g., of the scale section or the detector section). The determined offset value is used to correct one or more values ​​used to determine a relative position between the detector section and the scale section (e.g.,a spatial step or another spatial value of the scale segment).

The application discloses a master-slave positioning method and system based on a confidence factor from a UAV preferably distributed EKF, and relates to the technical field of UAV positioning. i , if the master UAV is invalid, calculating the confidence of each slave UAV i , selecting the slave UAV with the highest confidence, upgrading it to a temporary master UAV; constructing a state equation and a measurement equation of the slave UAV i; calculating an absolute measurement gain matrix and a relative measurement gain matrix respectively; calculating a predicted value of relative measurement information and updating a state variable and an error covariance matrix; and completing positioning. The application realizes normal operation of the system in the case of invalidation of the master UAV, and effectively controls the increase of positioning error caused by invalidation of the master UAV.

The present invention discloses a method for rapidly determining the Birk factor, TDCR, and absolute measurement. The method comprises: preparing a radioactive sample source with a known activity A for a scintillation fluid system whose Birk factor is to be determined, injecting the sample into a scintillation vial, and placing the vial in a liquid scintillation spectrometer; initializing the Birk factor value, constructing a detection efficiency relationship for three PMTs, sequentially changing the distance between the PMT focusing electrode and the scintillation fluid to change the detection efficiency and quenching indicator parameter; iteratively optimizing the Birk factor using the detection efficiency relationship, determining the optimal Birk factor and corresponding efficiency value, and completing the measurement. The method for rapidly determining the Birk factor, provided by the present invention, can rapidly complete the calibration of such scintillation fluids, facilitating subsequent absolute measurement, and greatly improving the convenience and accuracy of the absolute measurement method.

The invention relates to an absolute temperature measuring device and method based on an isotope absorption spectral line, and belongs to the technical field of temperature measurement. The measuring device comprises a light source, a micro air chamber and a light signal receiving piece which are sequentially arranged on a transmission light path, a mixture containing gas A and gas B is hermetically packaged in the miniature gas chamber, and the gas A and the gas B are different isotope gases of the same substance. The light absorption intensity of different isotope gases of the same substance is obtained, absolute temperature measurement is achieved (the absolute temperature is calculated according to the light absorption intensity ratio of the different isotope gases of the same substance), the problem that an existing measuring device cannot achieve absolute measurement in the true sense is solved, and the measurement accuracy is improved. The measurement principle of the invention abandons the traditional electrical temperature measurement principle, realizes absolute temperature measurement of'one-time calibration and lifelong maintenance-free 'directly based on molecular spectroscopy constants, and has the advantages of electromagnetic interference resistance, fast response, good long-term stability and the like.