69 results about "Absorption cell" patented technology

The invention relates to the technical field of laser light source measurement, and discloses a wide-range narrow-linewidth laser wavelength and linewidth measurement system, which can be flexibly matched with the center frequency of laser to be measured through the arrangement of a tunable laser, breaks through the strict limitation of the existing beat frequency method on the center frequency, effectively expands the measurement range, and improves the measurement accuracy. By combining the synergistic effect of the absorption cell and the locking loop, the system stability is improved, the measurement precision of narrow linewidth laser is guaranteed, the integration time can be flexibly adapted without tedious adjustment of a delay optical path or change of parameters of acquisition equipment through the cooperation of the optical modulator and the delay optical fiber, the problem of inconsistent measurement resolution under different integration time is avoided, and the measurement accuracy is improved. And the accuracy of short-time measurement is obviously improved. The system integrates wavelength and line width measurement functions, can measure line width, center wavelength and long-time frequency stability of to-be-measured laser, is reasonable in structural design, retains the advantage of high precision of a beat frequency method, overcomes the defects that an existing method is narrow in measurement range and inconvenient to adjust integral time, and improves the measurement accuracy of the to-be-measured laser. And the measurement requirements of wide-range and narrow-linewidth laser are met.

The invention relates to the technical field of gas sensing, and discloses a photoinduced thermoelastic spectrum gas concentration detection device and method based on an annular absorption cell, and the device comprises a light source system which is used for generating and outputting a wavelength-modulatable laser beam; the laser absorption system comprises an integrated annular absorption cell, an optical fiber collimator and an optical convergence lens, a laser window is arranged on the side wall of the integrated annular absorption cell, and after being input into the optical fiber collimator, a laser beam enters the integrated annular absorption cell through the laser window; after being reflected for multiple times, the light is emitted from the laser window and then enters the optical converging lens; the signal detection system is used for detecting the intensity of the emergent light focused by the optical converging lens and converting the intensity into an electric signal; and the data processing system is used for demodulating the electric signal generated by the signal detection system and inverting the concentration of the gas to be detected. The method corresponds to the device. According to the invention, the detection stability and the detection sensitivity are improved.

The invention relates to the technical field of gas sensing and optical detection, in particular to an annular multi-pass absorption cell and a detection method thereof.The annular multi-pass absorption cell comprises a reflecting mirror, the reflecting mirror is a cylinder with the two ends open, and a reflecting film is arranged on the inner wall of the reflecting mirror to form a continuous annular optical reflecting surface; the end cover assemblies are arranged at the openings in the two ends of the reflecting mirror, and a closed gas cavity is defined by the end cover assemblies and the reflecting mirror; an incident light hole and an emergent light hole are formed in the cylinder wall of the reflecting mirror and are respectively used for guiding a detection light beam to enter and exit from the gas chamber. The cylindrical reflector with two open ends is adopted, and an annular optical reflecting surface is formed on the inner wall of the cylindrical reflector, so that complex optical paths of discrete components in a traditional absorption cell are integrated in a single structure, the innovative design remarkably improves the system integration level, effectively compresses the size, can realize a longer absorption optical path in a limited space, and improves the absorption efficiency. The sensitivity of gas detection is greatly improved.

The invention belongs to the technical field of optical absorption cell parameter design, and particularly relates to an optical absorption cell design method and system based on PSO particle swarm optimization, and the method comprises the steps: S1, building a PSO model, defining each particle as an optical path, setting the number of particles and the maximum number of iterations, discretizing an absorption cell optical mirror surface into a movable grid, and defining the moving direction of the particles; s2, initializing the position and speed of a particle swarm based on the curvature radius, spacing and incident angle parameters of a reflector of the absorption cell; s3, performing optical simulation on each particle, and calculating a fitness value reflecting the optical length, the absorption cell volume and the light spot coverage based on a simulation result; updating an individual historical optimal path and a global historical optimal path; s3 is repeated after the speed and the position are updated and the state of each particle is adjusted; and S4, outputting the optical length, the volume and the lens number of the absorption cell corresponding to the final global optimal path. According to the method, efficient search can be carried out in the parameter space, and a globally optimal or approximately optimal solution is found.

The invention relates to the technical field of oil type gas monitoring, in particular to an oil type gas laser monitoring and early warning device and method, and the device comprises a processor control panel, a laser driver, a laser device group, a light path change-over switch, a diffusion type light absorption cell and a tuning fork detector; emergent laser with different gas spectrum absorption wavelengths is generated; switching each path of laser beam to a diffusion type absorption cell; respectively demodulating based on the acquired acquisition signals to obtain second harmonic signal voltages of optical signals of methane, ethane and hydrogen sulfide gas; inputting the second harmonic signal voltage of the optical signal absorbed by the to-be-detected gas into the residual neural network, identifying the methane and ethane gas overlapping spectrum, and outputting the methane and ethane gas concentration in the to-be-detected gas; and generating a multi-parameter early warning signal according to the methane and ethane gas concentrations and the hydrogen sulfide concentration. The light absorption detection can be accurately carried out on methane, ethane and hydrogen sulfide in the oil type gas, and the methane and ethane gas overlapping spectrum can be effectively identified.

The utility model provides a long-optical-path multi-reflection type oxygen concentration detection device which is used for solving the technical problems that an existing oxygen concentration detection device is low in identifiability and not high in sensitivity. The device comprises a laser transmit-receive optical system, a controller and a drive control unit, the controller is connected with the drive control unit, the drive control unit is connected with a laser of the laser transmit-receive optical system, a photoelectric detector of the laser transmit-receive optical system is connected with the controller, the laser transmit-receive optical system further comprises a gas absorption cell, and the gas absorption cell is connected with the controller. A long-optical-path multiple-reflection optical system is arranged in the gas absorption cell, the laser is arranged in front of a light input port of the long-optical-path multiple-reflection optical system, and the photoelectric detector is arranged on a light path of a light output port of the long-optical-path multiple-reflection optical system. The device has high resolution, and interference with other molecules can be avoided; the structure is simple and easy to realize; not only is the operation easy, but also the cost is effectively saved; the measurement process is very easy to realize and the practicability is very strong.

1. Name of the product in this design: Gas Absorption Cell (Long Optical Path Multiple Reflections). 2. Purpose of this design: for gas detection and gas measurement. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

The present invention discloses a subwavelength ventilated asymmetric sound absorber, which is composed of one or more absorption cells. The absorption cell includes a metamaterial resonator and a backing impedance boundary. The backing impedance boundary includes a rear panel, a top panel, a bottom panel, a long plate and a short plate, which together form an L-shaped structure; a flow port is provided on the upper portion of the rear panel to facilitate airflow; the bottom of the metamaterial resonator is placed on the short plate of the backing impedance boundary, and a channel is left between it and the bottom plate of the backing impedance boundary; the back of the metamaterial resonator is fixedly connected to the side of the long plate of the backing impedance boundary, and a channel is left between it and the rear panel of the backing impedance boundary. The deep subwavelength absorber of the present invention can almost perfectly absorb the sound energy incident from the loss end and almost perfectly reflect the sound energy incident from the opposite end, has a good suppressive effect on broadband noise, and can achieve ventilation and heat dissipation functions while controlling noise.

The invention discloses a low-cost portable NDIR (Non-Dispersive Infra-Red) exhaled gas acetone detection device and an application method thereof, a constant current driving module is used for guaranteeing the stability of a base line, an infrared light source module is used for providing a stable intermediate infrared radiation source, an infrared light source is used for covering an acetone characteristic absorption wave band, and a gas absorption pool module is used for improving the detection sensitivity; the dual-channel infrared detection module is used for accurately capturing a light intensity attenuation signal of an acetone characteristic absorption wave band and realizing differential detection and anti-interference compensation, and the signal acquisition and amplification module is used for extracting an effective component related to the acetone concentration from a weak signal output by a pyroelectric detector; the upper computer processing module is used for performing differential operation and concentration inversion and calculating the concentration value of acetone in exhaled air; by fusing an MEMS infrared light source, a multiple reflection light path and a two-channel differential detection technology, high-sensitivity detection is realized, and a popular portable solution is provided for early screening of diabetes mellitus metabolic disorder and lung cancer.

This invention relates to a gas absorption cell for spectral parameter measurement, its installation method, and measurement method, belonging to the field of spectral parameter measurement technology. The gas absorption cell includes a gas absorption chamber and light transmission chambers symmetrically arranged on both sides of the absorption chamber. The light transmission chamber includes a containment chamber and a vacuum chamber, with the vacuum chamber located close to the gas absorption chamber. The gas absorption chamber and the vacuum chamber are separated by a third or fourth window, and the vacuum chamber and the containment chamber are separated by a spacer. The containment chamber houses the transmitting or receiving unit of the absorption spectrometer. The gas absorption chamber is filled with the target gas for spectral parameter measurement. The invention employs a five-segment structure consisting of the gas absorption chamber and the containment and vacuum chambers distributed on both sides of it, eliminating the need for a light guide device, resulting in a simple structure and convenient operation.

The application relates to the technical field of gas spectrum detection, and discloses a CO2 gas concentration dual-wavelength detection system and method based on TDLAS-WMS, which comprises a main control upper computer, a signal generation and modulation module, a dual-channel laser module, an optical path module, a gas absorption cell, a photoelectric detection module and a signal acquisition and lock-in amplification module. The method comprises the following steps: initializing and loading parameters; generating a driving signal of superimposed scanning and modulation to drive a laser; extracting a second harmonic signal after the laser passes through the gas to be detected; realizing high signal-to-noise ratio concentration signal acquisition, automatically judging whether the current waveband is saturated or under-response, switching to another waveband, and realizing self-adaptive dynamic detection. Through dual-wavelength cooperation and self-adaptive switching, the technical problems of narrow dynamic range, easy saturation at high concentration, insufficient sensitivity at low concentration, and large error of a single-wavelength TDLAS system are solved, and wide-range, high-precision and continuous self-adaptive detection from low concentration to high concentration are realized.

This invention discloses an in-situ calibration system for an underwater dissolved gas sensor with an integrated self-calibration module. A 2004nm butterfly laser module emits laser light, and a Herriott absorption cell module allows the laser to be reflected multiple times by the detector gas, resulting in selective absorption of the laser at a characteristic wavelength to form an absorption spectrum. A synchronization control module handles power supply, communication, environmental parameter control, and calibration timing control, enabling synchronized switching between the system's measurement and calibration modes. A data processing module inverts the spectral data collected by the system to obtain dissolved gas concentration data. A self-calibration gas supply unit introduces standard gas into the Herriott absorption cell module when the calibration program starts. This invention integrates the self-calibration function with the sensor detection unit, effectively simplifying the operation and maintenance process of underwater gas monitoring, improving the long-term stability of the sensor, and making it suitable for in-situ dissolved gas monitoring in various underwater environments such as oceans, lakes, and reservoirs.

The invention relates to the technical field of spectrum detection, in particular to a multi-optical-path gas absorption cell which comprises a gas chamber, a first cavity mirror and a second cavity mirror, the first cavity mirror and the second cavity mirror are arranged at the two ends of the gas chamber, and each of the first cavity mirror and the second cavity mirror at least comprises a circular integration region, an inner annular reflection region and an outer annular reflection region, and the circular integration region is sleeved with the inner annular reflection region and the outer annular reflection region; the optical axis of the circular integration area of the first cavity mirror coincides with the optical axis of the circular integration area of the second cavity mirror. An included angle exists between the optical axes of the inner annular reflecting region of the first cavity mirror and the inner annular reflecting region of the second cavity mirror; the optical axis of the outer annular reflecting area of the first cavity mirror coincides with the optical axis of the outer annular reflecting area of the second cavity mirror. According to the invention, a heterotype mirror capable of realizing multi-optical-path detection is designed by combining a multi-pass cell and an off-axis integral cavity technology to replace a traditional cavity mirror, so that the problem that different optical paths cannot be compatible in a single gas chamber structure is solved, and multi-component trace gas absorption detection with a self-defined range can be realized through a single gas chamber.

This invention relates to a wide dynamic range laser spectroscopy gas concentration detection device and method. The device includes: a long-path absorption cell comprising two opposing first and second concave mirrors, wherein during operation, a first laser beam undergoes multiple reflections between the two concave mirrors to form a first absorption optical path; an optical resonant cavity sharing a gas cavity with the long-path absorption cell, comprising a second entrance window and a second exit window disposed at the geometric center region of the first and second concave mirrors, wherein the geometric center region is the non-spot region of the first laser beam; and a pair of high-reflectivity mirrors respectively disposed on the second entrance window and the second exit window, wherein during operation, the second laser beam undergoes multiple reflections between the two high-reflectivity mirrors to form a second absorption optical path; the second absorption optical path is not less than 100 times the first absorption optical path. This invention combines the advantages of both the long-path absorption cell and the optical resonant cavity, achieving full-range gas concentration measurement from ultra-low concentrations (ppb) to percentage concentrations through a single gas chamber.

The utility model discloses an air purification device which comprises a main body with a hollow inner cavity, an air inlet and an air outlet which are formed in the two ends of the main body respectively, and an air inlet assembly, a fumigation assembly, an absorption assembly, a photocatalysis assembly and an air outlet assembly which are sequentially arranged in the main body in the air inlet direction. The fumigation assembly comprises a liquid storage bin used for storing a chlorine dioxide aqueous solution and an ultrasonic nebulizer arranged in the liquid storage bin and located below the liquid level. The absorption assembly comprises an absorption tank for storing water, an air inlet pipe with one end inserted into the absorption tank and an air outlet pipe with one end inserted into the absorption tank, and the other end of the air inlet pipe extends out of the absorption tank and is positioned above the liquid level in the liquid storage bin; the photocatalytic component comprises a photocatalytic treatment bin, an ultraviolet light source arranged in the photocatalytic treatment bin and a titanium dioxide nano coating; the other end of the gas outlet pipe extends out of the absorption cell and is positioned in the photocatalytic treatment bin. The air purification device disclosed by the utility model has a better overall purification effect on indoor air.

Present invention relates to a needle-free glucose measurement system which enable measurement of blood glucose level using concentration value of N2O molecule available in breath air, which comprises an electronic assembly (1.1) which stabilizes the temperature and flow of wavelength-adjustable laser light source (1.2) and controls wavelength, a laser-based sensor (1) which determines concentration values of N2O molecule by measuring the adsorption amount of detector (1.5) wherein beams coming from laser light source (1.2) are adsorbed by N2O molecules in the breath air in the adsorption cell (1.4), and a processor (2) which determine glucose values in the blood using the concentration data coming from laser-based sensor (1).

The invention relates to an etching end point detection method and system based on filtering scanning, and the method comprises the steps: irradiating infrared light emitted by a light source to an absorption cell, so as to output detection light after absorbing target gas; controlling the filter to perform wavelength scanning on the detection light, and identifying at least one characteristic wavelength point with an absorption peak; setting the fixed working frequency of the filter to allow the filter to pass through the detection light of the characteristic wavelength point; scanning the detection light of the characteristic wavelength point to obtain a first light intensity vector containing interference; calibrating a sidelobe response function matrix S of the filter; calculating the first light intensity vector according to the sidelobe response function matrix S to obtain a second light intensity vector for eliminating interference; and calculating the characteristic concentration c of the target gas according to the second light intensity vector, and judging an etching end point. According to the invention, the accuracy degree of etching end point judgment can be improved.

The invention relates to the technical field of noise light processing, in particular to a Herriott multi-pass cell-based noise optical isolator, which is used for filtering noise light contained in light rays of a light source and comprises a Herriott multi-pass cell, an absorption cell and a filtering medium, the Herriott multi-pass cell comprises a first concave mirror and a second concave mirror, a light inlet hole and a light outlet hole are formed in the edge positions of the first concave mirror and the second concave mirror respectively, the absorption cell is located between the first concave mirror and the second concave mirror, a filtering medium is contained in the absorption cell, and light of a light source enters the Herriott multi-pass cell through the light inlet hole; the light source light is repeatedly reflected between the first concave mirror and the second concave mirror and then leaves the Herriott multi-pass cell through the light outlet hole, and the light source light passes through the filter medium in the absorption cell during each reflection so as to filter noise light in the light source light. According to the invention, the optical path length of the light of the light source in the absorption cell is multiplied, the saturable absorption of small-signal noise light is realized, and the noise light isolation degree is effectively improved.

The application relates to the technical field of experimental instruments, in particular to an atomic absorption cover for experimental detection, which comprises an expansion cover and a wind guide pipe fixedly installed at the upper end of the expansion cover, the upper end of the wind guide pipe is provided with a gathering cover, the upper end of the gathering cover is fixedly provided with a wind guide fan, one side of the wind guide fan is provided with an exhaust pipe, and the inside of the wind guide pipe is fixedly provided with two air distribution plates; compared with the prior art, the atomic absorption cover can realize multi-mode selection during gas absorption by being provided with the expansion cover, an adjusting mechanism, a first air distribution plate, a second air distribution plate and the air distribution plates arranged in the inside of the wind guide pipe, can be arbitrarily switched for use in large-area air suction or channel air suction according to actual use requirements, and can solve the defects of a traditional fixed atomic absorption cover, can realize large-area air suction and prevent harmful gas from overflowing, and can realize strong air suction in a small-area range and improve air suction effect.

This invention relates to the field of spectral detection technology, specifically providing a multi-path gas absorption cell, comprising: a gas chamber, and a first cavity mirror and a second cavity mirror disposed at both ends of the gas chamber. Each of the first and second cavity mirrors includes at least: a circular integrating region, and an inner annular reflection region and an outer annular reflection region surrounding the circular integrating region; wherein the optical axes of the circular integrating regions of the first and second cavity mirrors coincide; the optical axes of the inner annular reflection regions of the first and second cavity mirrors are at an angle; and the optical axes of the outer annular reflection regions of the first and second cavity mirrors coincide. This invention, by combining multi-path cell and off-axis integrating cavity technology, designs a non-standard mirror that can realize multi-path detection, replacing traditional cavity mirrors and overcoming the problem of incompatibility between different optical paths in a single gas chamber structure. It enables the detection of trace gases with multiple components and custom ranges through a single gas chamber.

The present invention discloses a method and apparatus for synthesizing CF4 by activating SF6 using a two-stage dielectric barrier discharge (DBD) plasma. The present invention proposes a two-stage DBD plasma activation method for degrading SF6 and introducing CO2 gas to synthesize CF4. The first-stage DBD plasma reactor degrades SF6 molecules, breaking them down into fluorine atoms and other low-fluorine and sulfur small molecules. This step not only effectively degrades SF6 but also provides the necessary fluorine source for subsequent CF4 synthesis. The second-stage DBD plasma reactor uses CO2 as a carbon source to react with the low-fluorine and sulfur small molecules produced in the first reaction to generate CF4 gas. The CF4-containing mixed gas undergoes a first-stage condensation process to condense some of the fluorine-containing acidic waste gas into a liquid state. The remaining mixed gas then undergoes a second-stage condensation process to condense the CF4 gas into a liquid state and collect it, achieving efficient product separation and purification. Some acidic gases that do not participate in the reaction are treated in an alkaline absorption tank to reduce environmental harm.

The present invention proposes a hollow frustum-shaped multi-pass absorption cell, which relates to the field of gas measurement technology. The hollow frustum-shaped multi-pass absorption cell includes: a hollow circular plane mirror, a hollow circular concave spherical mirror, a hard plastic tube, two tripod mirror frames, three support rods, two window pieces, two pressing pieces, and a rubber ring. The hard plastic tube includes an inner circumference and an outer circumference. The hollow circular plane mirror and the hollow circular concave spherical mirror are respectively nested and fixed between the inner circumference and the outer circumference at both ends of the hard plastic tube and sealed with a rubber ring. The hollow frustum-shaped multi-pass absorption cell proposed by the present invention uses a special cutting method to obtain an inner diameter and an outer diameter of the hollow circular plane mirror that are smaller than the inner diameter and outer diameter of the hollow circular concave spherical mirror, thereby making high use of the mirror surface. At the same time, the hollow frustum-shaped absorption cell structure is formed by combining a specific hollow frustum-shaped hard plastic tube, so that a stable light field distribution is formed inside the absorption cell, thereby improving the mirror surface utilization rate and the gas exchange rate.

The utility model discloses a gas analyzer for detecting indole and 3-methylindole. The gas analyzer comprises a preprocessor, an ultraviolet differential absorption spectrometry analyzer and a sampling control and data processing unit, the preprocessor comprises a particulate matter filter and a heater which are connected through a pipeline; the ultraviolet differential absorption spectrometry analyzer comprises a heating gas absorption cell connected with the heater, and the heating gas absorption cell is respectively connected with a spectrograph and an ultraviolet light source generation module through optical fibers. The problems of complicated operation steps and long time consumption of original gas chromatography, high performance liquid chromatography or liquid chromatography-mass spectrometry and the like can be solved, and the indole gas can be intuitively and qualitatively determined; one gas analyzer can be used for monitoring other indole derivative gases, so that the gas analyzer has multiple functions, the purchase cost of a user is reduced, social resources are saved, and convenience is brought to use of people.

The utility model relates to the technical field of greenhouse gas detection, in particular to a low-cavity-mode gas absorption cell for closed-cavity flux greenhouse gas monitoring, which comprises a laser used for emitting laser beams, and further comprises a base, a gas absorption tube, a gas absorption tube and a gas absorption tube, and the strip-shaped reflecting mirror a and the strip-shaped reflecting mirror b are respectively arranged at the two ends of the base. According to the utility model, the ultra-thin strip-shaped reflecting mirror is adopted, so that the low-cavity-die and long-optical-path gas absorption cell is realized, the measurement optical path exceeds 5m, the cavity die volume is less than 15mL and the gas replacement time is less than 1s under the condition of small volume, and the absorption cell adopts an up-and-down structure, has few parts, is low in cost and is convenient to debug and maintain; by means of rapid gas replacement and optimized light path design, laser beams can interact with newly entering gas more rapidly, the detector can detect gas concentration changes more timely, flux monitoring precision is improved, and greenhouse gas flux data can be obtained more accurately.

The utility model relates to the technical field of carbon nitrogen emission monitoring, in particular to a dynamic monitoring device for non-point source carbon nitrogen emission, which comprises a supporting rod, a rotating table is rotatably connected to the top end of the supporting rod, a gas absorption tank is fixedly arranged in the middle of the rotating table, and a photoelectric detector is inserted into one end of the gas absorption tank. A tunable semiconductor laser is inserted into the other end of the gas absorption cell; compared with traditional dynamic monitoring equipment for non-point source carbon and nitrogen emission, according to the dynamic monitoring equipment for non-point source carbon and nitrogen emission, the filtering assembly is arranged at the end of the air pump according to requirements and comprises the mounting cylinder and the end cover, and air can be pumped into the mounting cylinder by starting the air pump; air is sequentially filtered through the grating net, the inner bag, the outer bag and the filter net and then conveyed into the first pipeline, the inner bag collides and rubs on the surfaces of the protruding blocks, and therefore dust accumulation on the surface of the inner bag is reduced, the stability of air circulation and filtering is improved, dust particles entering the first pipeline are reduced, pollution is reduced, and the precision of laser detection is improved.

The utility model relates to a multi-channel water quality COD (Chemical Oxygen Demand) detection device for deep ground environment development, which comprises a bunching wire, a plurality of water quality COD detection devices and a plurality of water quality COD detection devices, wherein the bunching wire comprises a steel wire main body and a plurality of wire harnesses arranged in the steel wire main body; the probe is connected with one end of the cluster wire and comprises a detection shell and an absorption cell arranged in the detection shell, a to-be-detected water body enters the absorption cell through the detection shell, a light incident port and a light emergent port are formed in the top of the probe, and a reflection assembly is arranged in the absorption cell; light entering the absorption cell from the light entrance port is reflected by the reflection assembly and is emitted from the light exit port; the operation terminal is connected with the other end of the bunching wire and is used for emitting detection light rays into the light incident port through the wire harness and analyzing spectral information of light rays reflected back by the light emergent port through the wire harness; and the buoy is sleeved on the cluster wire to enable the probe to suspend in the water body, so that the multi-channel water quality COD detection device is provided, and the problems of secondary pollution and insufficient real-time performance and regionality existing in the detection of water quality COD by the existing related device are solved.

This invention relates to the field of noise light processing technology, specifically providing a noise light isolator based on a Heriot-Limiter multi-pass cell for filtering noise light contained in light from a light source. The isolator includes a Heriot-Limiter multi-pass cell, an absorption cell, and a filter medium. The Heriot-Limiter multi-pass cell includes a first concave mirror and a second concave mirror, with an entrance aperture and an exit aperture respectively located at their edges. The absorption cell is located between the first and second concave mirrors and contains the filter medium. Light from the light source enters the Heriot-Limiter multi-pass cell through the entrance aperture and is repeatedly reflected between the first and second concave mirrors before exiting the cell through the exit aperture. During each reflection, the light from the light source passes through the filter medium in the absorption cell, thus filtering out noise light from the light source. This invention significantly increases the optical path length of the light source in the absorption cell, achieving saturable absorption of small-signal noise light and effectively improving noise light isolation.

The application claims a photothermal detection device for non-invasive glucose detection, comprising a quantum cascade laser, a DFB detection laser, an optical medium, a dove prism, a parabolic mirror, an optical chopper, an optical polarizer, a photodetector, a lock-in amplifier, a data acquisition card and a computer, and innovatively proposes an interferometric intensity demodulation-based photothermal detection technology. The miniaturized dove prism absorption cell structure is combined with the FPE (Fabry-Perot cavity), so that it has better vibration resistance. The device adopts a non-invasive detection method, can detect the blood glucose concentration in real time without blood sampling, reduces the pain of patients, improves the convenience and comfort of detection, and has important significance for the development of biological medical detection.

The invention relates to the technical field of neutral atom quantum computing, in particular to a device and method for locking dual-wavelength laser frequency through a single absorption cell. The device comprises an atomic absorption cell, a first reflector and a second reflector, the atomic absorption cell receives a first laser and a second laser, and the first laser and the second laser are respectively emitted into the atomic absorption cell at a first preset angle and a second preset angle relative to a short axis of the atomic absorption cell; the first reflecting mirror and the second reflecting mirror are respectively arranged on two sides of the atomic absorption cell, so that the first laser and the second laser can be reflected back and forth for multiple times between the two reflecting mirrors so as to penetrate through the atomic absorption cell for multiple times; a third reflecting mirror is arranged on a first emergent path of the first laser from the atomic absorption cell, and the first laser is vertically incident to the third reflecting mirror; a fourth reflecting mirror is arranged on a first emergent path of the second laser from the atomic absorption cell, and the second laser is vertically incident to the third reflecting mirror; wherein the light paths of the first laser and the second laser do not coincide.

The utility model relates to the technical field of film dosimeter detection, in particular to a measuring rack for a film dosimeter, which comprises an absorption cell frame and a cuvette, a first light inlet and a first light outlet are symmetrically arranged on two sides of the absorption cell frame, and a cuvette accommodating cavity is arranged in the absorption cell frame. The cuvette containing cavity comprises a cavity body and a limiting cavity formed in the side end of the cavity body, a limiting elastic piece is arranged in the limiting cavity, the cuvette comprises a first rotating plate and a second rotating plate, the second rotating plate is rotationally arranged at the upper end of the first rotating plate through a torsional spring, a second light inlet is formed in the lower end of the first rotating plate in a penetrating mode, and a second light outlet is formed in the lower end of the second rotating plate. A second light outlet is formed in the lower end of the second rotating plate in a penetrating mode, and the section of the second light inlet is trapezoidal. According to the utility model, the position of the film dosimeter is absolutely stable in the measurement process, so that the obtained data is more accurate and consistent, the experiment efficiency can be improved, and the resource waste caused by duplicate sampling and measurement is reduced.