Portable raman spectrometer for simultaneous detection of ammonium dihydrogen phosphate and ammonium sulfate content in dry powder extinguishing agent

Abstract

The utility model provides a portable raman spectrometer of ammonium dihydrogen phosphate and ammonium sulfate content in dry powder extinguishing agent is detected simultaneously, including portable casing, light path detection system, analysis system and power module of setting in portable casing and with portable casing assembly display module, light path detection system sets in the upper portion of portable casing, and it includes laser emission module, setting in the direction of laser beam dichroic mirror, setting in the direction of sample bin of dichroic mirror reflected light and setting in the direction of detection module of dichroic mirror transmission raman spectrum, and setting mirror module between dichroic mirror and sample bin, analysis system sets in the middle part of portable casing, and it includes control circuit, control circuit with laser emission module, detection module and display module signal connection. The utility model improves the efficiency of detection work, also ensures the accuracy of result, is the ideal tool of on -the -spot rapid detection.

Description

[0001] This application claims domestic priority to the application filed on April 17, 2025, entitled "Portable Raman Spectrometer for Simultaneous Detection of Ammonium Dihydrogen Phosphate and Ammonium Sulfate Contents in Dry Powder Fire Extinguishing Agents," the entire contents of which are incorporated herein by reference. Technical Field

[0002] This utility model belongs to the field of dry powder fire extinguishing agent detection, specifically relating to a portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents. Background Technology

[0003] Ammonium dihydrogen phosphate and ammonium sulfate are the main components of ABC dry powder fire extinguishing agents, which can effectively extinguish various types of fires. The extinguishing efficiency is positively correlated with the content of the main components; the higher the content of the main components, the stronger the extinguishing ability and the wider the coverage area. Therefore, whether the content of ammonium dihydrogen phosphate and ammonium sulfate in the main components meets the standards is one of the core indicators for evaluating the quality of fire extinguishing agents.

[0004] Traditional methods for detecting components in dry powder fire extinguishing agents include the molybdenum-antimony spectrophotometric method, the malachite green-phosphomolybdic acid heteropolyacid spectrophotometric method, and the quinoline phosphomolybdate gravimetric method. These methods are complex and time-consuming, making them unsuitable for rapid on-site testing. Furthermore, the contents of ammonium dihydrogen phosphate and ammonium sulfate need to be tested separately.

[0005] To meet the needs of rapid on-site testing, there is an urgent need for a portable device suitable for rapid on-site detection that can simultaneously detect the content of ammonium dihydrogen phosphate and ammonium sulfate. Utility Model Content

[0006] This invention provides a portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents, aiming to provide a convenient and rapid on-site detection solution.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents, comprising: a portable housing, an optical path detection system, an analysis system, and a power supply module disposed within the portable housing, and a display module assembled with the portable housing; wherein, The optical path detection system is located on the upper part of the portable housing. It includes a laser emitting module for emitting a laser beam, a dichroic mirror positioned in the direction of the laser beam, a sample chamber positioned in the direction of the reflected light from the dichroic mirror, and a detection module positioned in the direction of the transmitted Raman spectrum from the dichroic mirror. It also includes a galvanometer module positioned between the dichroic mirror and the sample chamber. Furthermore, it includes an internal reference window and a cooling and temperature control system. The internal reference window is positioned between the galvanometer module and the sample chamber. The sample chamber is located near the upper side of the portable housing, and the cooling and temperature control system is located on the upper side of the portable housing away from the sample chamber to reduce thermal noise inside the instrument. The analysis system is located in the middle of the portable housing and includes a control circuit, which is signal-connected to the laser emission module, the detection module, and the display module. The display module shows the detection interface and detection results.

[0008] In this embodiment, the portable Raman spectrometer cleverly integrates the analysis system, optical path detection system, power module, and display module within a portable housing. To improve detection accuracy, a galvanometer module is incorporated into the portable Raman spectrometer, solving the problem of large signal acquisition errors in powder samples and resulting in smaller test result errors. This application utilizes Raman spectroscopy to rapidly and accurately determine the content of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents. It boasts advantages such as small size and light weight, making it suitable for transport to various testing sites. No complex installation process is required, and the operation is simple and convenient. Testing personnel can quickly and intuitively obtain test results from the display module. This portable Raman spectrometer not only improves the efficiency of testing work but also ensures the accuracy of results, making it an ideal tool for rapid on-site testing.

[0009] In one embodiment, the optical path detection system further includes a cooling and temperature control system connected to the control circuit, the cooling and temperature control system being disposed on one side of the laser emitting module and the galvanometer module.

[0010] In this embodiment, by setting up a cooling and temperature control system to adjust the temperature inside the sample chamber in real time, thermal noise can be effectively reduced, the signal-to-noise ratio and resolution of the detection can be improved, the reliability of the spectral analysis results can be ensured, the wavelength stability of the detection beam can be avoided due to temperature fluctuations, a stable detection environment can be maintained, and the impact of temperature changes on the measurement results can be reduced.

[0011] In one embodiment, the dichroic mirror is positioned at a 45° angle to the laser beam, and the sample chamber is located near the upper side of the portable housing.

[0012] In one embodiment, the sample chamber is adapted to contain a cuvette, and a chamber lid suitable for sealing is provided on the sample chamber.

[0013] In one embodiment, the optical path detection system further includes an internal reference window disposed between the galvanometer module and the sample chamber.

[0014] In the embodiments of this application, an internal reference material is introduced during the detection process as a stable reference point in the spectral measurement, which helps to improve the accuracy of the measurement, reduce measurement errors caused by instrument aging or changes in internal components, and ensure the reliability of the detection data.

[0015] In one embodiment, the optical path detection system further includes a first collimating lens and a first filter. The first collimating lens and the first filter are sequentially disposed at the emitting end of the laser emitting module. The emitted beam of the laser emitting module is converged into a parallel beam by the first collimating lens and filtered into a beam with a wavelength suitable for detecting ammonium dihydrogen phosphate and ammonium sulfate by the first filter.

[0016] In one embodiment, the optical path detection system further includes a focusing lens, a second filter, and a second collimating lens. The focusing lens is disposed between the dichroic mirror and the galvanometer module. The focusing lens is adapted to converge a parallel beam of light directed toward the sample chamber and to converge a divergent beam of light scattered by the sample in the sample chamber into a parallel beam. The second filter and the second collimating lens are sequentially disposed on the transmission side of the dichroic mirror. The second filter is used to filter wavelengths that are not related to ammonium dihydrogen phosphate and ammonium sulfate, and the second collimating lens is used to focus the filtered light beam to the receiving end of the detection module.

[0017] In one embodiment, the control circuit includes: The processor includes a central processing unit and a graphics processing unit. The central processing unit is connected to the cooling and temperature control system, the laser emitting module, and the power module via a temperature control interface, a transmission interface, and a power interface, respectively. The graphics processing unit is connected to the display module via a display interface. An encoder, signal-connected to the optical path detection system and the central processing unit, is used to convert optical signals received from the optical path detection system into electrical signals; A flash memory, signal-connected to the central processing unit, is used to store the detection program and detection results running in the processor, wherein the detection program derives the detection results based on Raman spectroscopy analysis; and The dynamic memory, which is signal-connected to the central processing unit, is used to store dynamic data generated during the operation of the detection program.

[0018] In one embodiment, the refrigeration and temperature control system includes a cooler and a temperature sensor, the cooler and the temperature sensor being respectively connected to the sample chamber for sensing temperature, the cooler being signal-connected to the temperature sensor, and the cooler being adapted to adjust the temperature inside the sample chamber according to the temperature signal provided by the temperature sensor.

[0019] In one embodiment, the display module includes an LED display screen fixed to the portable housing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of the portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents according to this invention. Figure 2 This is a schematic diagram of the external structure of the portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents according to this invention. Figure 3 This is a schematic diagram of the optical path detection system of this utility model; Figure 4 This is a block diagram of the control circuit of this utility model.

[0021] Explanation of reference numerals in the attached figures: 100 - Refrigeration and temperature control system; 200 - Analysis System; 201 - Processor; 2011 - Central Processing Unit; 2012 - Graphics Processing Unit; 202 - Flash Memory; 203 - Dynamic Memory; 204 - Temperature Control Interface; 205 - Transmission Interface; 206 - Encoder; 207 - Display Interface; 208 - Power Interface; 300-Power Module; 400 - Portable Case; 500 - Optical path detection system; 501 - Laser emission module; 502 - First collimating lens; 503 - First filter; 504 - Dichroic mirror; 505 - Focusing lens; 506 - Galvanometer module; 507 - Internal reference window; 508 - Sample chamber; 509 - Second filter; 510 - Second collimating lens; 511 - Detection module; 600 - Display Module. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] Existing technologies commonly use the molybdenum-antimony spectrophotometric method, the malachite green-phosphomolybdic acid heteropolyacid spectrophotometric method, and the quinoline phosphomolybdate gravimetric method to determine the content of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents. The molybdenum-antimony spectrophotometric method requires multiple steps, including sample dissolution, filtration, and colorimetric reaction. Each step requires strict control of conditions such as acidity, reaction time, and temperature; even slight errors in operation can affect the accuracy of the results. The entire determination process, including sample preparation, colorimetric reaction, and absorbance measurement, typically takes a considerable amount of time, especially since the colorimetric reaction needs to be completed within a certain timeframe, and the generated molybdenum blue solution needs to stabilize for a period before measurement. The entire process may take 1-2 hours or even longer. The malachite green-phosphomolybdic acid heteropolyacid spectrophotometric method, in addition to sample preparation and colorimetric reaction, also requires a digestion step. The digestion process requires strict control of temperature and time to ensure that the phosphorus in the sample is completely converted to orthophosphate; otherwise, the accuracy of the determination results will be affected. The digestion process typically requires a long time at high temperatures, generally more than 30 minutes. Including sample preparation, colorimetric reaction, and absorbance measurement, the entire determination process takes 1-2 hours or even longer. The quinoline phosphomolybdate gravimetric method requires multiple steps, including precipitation reaction, filtration, washing, and drying. Each step requires strict operation to ensure the purity and accuracy of the precipitate. The process is cumbersome and prone to errors, and the precipitation reaction is very time-consuming.

[0027] To address the drawbacks of existing detection methods, such as cumbersome operation and long processing times, this invention provides a portable Raman spectrometer for simultaneously detecting the content of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents. All necessary systems and modules are integrated into a compact portable housing. During testing, the sample is simply placed in the sample chamber, and the instrument's internal optical path detection system automatically acquires the sample's spectral information and feeds it back to the analysis system for interpretation. Based on Raman spectroscopy analysis, the content of ammonium dihydrogen phosphate and ammonium sulfate is quickly determined, and the testing personnel can intuitively obtain the results from the display module. This solution eliminates many tedious and complex operating steps, reduces the difficulty of detection, effectively improves detection efficiency, and its portable design makes it easy to carry and suitable for on-site testing.

[0028] Please refer to the attached document as well. Figure 1 To be continued Figure 4 This invention provides a portable Raman spectrometer for simultaneously detecting the content of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents. The portable Raman spectrometer includes a portable housing 400, an optical path detection system 500, an analysis system 200, a power module 300, and a display module 600 that is attached to the portable housing 400. The optical path detection system 500 acquires Raman spectral information from the sample and transmits it to the analysis system 200 for analysis. The intensity of characteristic peaks in the Raman spectrum is proportional to the concentration of molecules; therefore, the component content of substances can be quantitatively analyzed by measuring the intensity of characteristic peaks, thereby rapidly detecting the content of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agent samples. Specifically, the optical path detection system 500 is located on the upper part of the portable housing 400. It includes a laser emitting module 501 for emitting a laser beam, a dichroic mirror 504 positioned in the direction of the laser beam, a sample chamber 508 positioned in the direction of the reflected light from the dichroic mirror 504, a detection module 511 positioned in the direction of the transmitted Raman spectrum from the dichroic mirror 504, and a galvanometer module 506 positioned between the dichroic mirror 504 and the sample chamber 508. The analysis system 200 is located in the middle of the portable housing 400 and is used to receive and analyze Raman spectral information. It includes a control circuit, which is signal-connected to the laser emitting module 501, the detection module 511, and the display module 600. The display module 600 displays the detection interface and detection results, allowing operators to intuitively obtain the detection data.

[0029] Using the embodiments of this application, the testing personnel only need to place a certain amount of dry powder fire extinguishing agent sample into the sample chamber 508 and operate it through the display module 600. The optical path detection system 500 emits a laser into the sample chamber 508 and collects the sample scattered light carrying Raman spectral information, which is then input into the analysis system 200. Based on Raman spectroscopy, the contents of ammonium dihydrogen phosphate and ammonium sulfate are analyzed, and finally the detection results are transmitted to the display module 600. This portable Raman spectrometer has the advantages of compact structure, small size, and light weight, making it convenient to carry to the field for rapid detection. Compared with traditional detection methods, it saves a lot of processing steps, reduces the operational difficulty of the detection process, and improves detection efficiency.

[0030] In one embodiment, the optical path detection system 500 further includes a cooling and temperature control system 100 connected to the control circuit. This system collects temperature data and feeds it back to the control circuit, adjusting the sample temperature in real time according to temperature changes. The cooling and temperature control system 100 is located on one side of the laser emission module 501 and the galvanometer module 506.

[0031] In this embodiment, a cooling and temperature control system 100 is provided in the instrument. The system determines whether cooling is needed by using a preset temperature range, so that the sample temperature is always kept within a range suitable for collecting spectral information, thereby reducing the thermal noise inside the instrument, improving the signal-to-noise ratio and resolution of the detection, ensuring the accuracy of spectral analysis, and avoiding the impact of temperature fluctuations on the measurement results.

[0032] In the optical path detection system 500, the dichroic mirror 504 is positioned at a 45° angle to the laser beam, and the sample chamber 508 is located in one corner of the portable housing 400. This improves the compactness of the internal component layout, increases the utilization rate of the instrument's internal space, reduces the instrument's size, and ensures its portability. The sample chamber 508 is suitable for holding cuvettes and has a sealable lid to prevent sample contamination. The sample chamber is located on the upper side of the portable Raman spectrometer, facilitating the layout of the various modules.

[0033] To improve detection accuracy, the optical path detection system 500 also includes an internal reference window 507, which is positioned between the galvanometer module 506 and the sample chamber 508, facilitating the addition of the internal reference material during detection. During detection, a spectrometer is used to acquire spectra of the sample and the internal reference material, recording their respective spectral data. The acquired spectral data is analyzed to determine the characteristic Raman bands of the target component in the sample and the bands of the internal reference material. The ratio of the band intensity of the target component in the sample to the band intensity of the internal reference material is calculated. Using the known concentration of the internal reference material and its band intensity, a calibration curve is established. By comparing the intensity ratio of the target component in the sample to that of the internal reference material, the concentration of the target component is calculated using the calibration curve.

[0034] In this embodiment, by setting an internal reference material, the influence of fluctuations in operating conditions (such as injection volume, instrument response, etc.) on the analytical results can be calibrated and eliminated. Quantitative analysis is performed by comparing the response value (peak area or peak height) with that of the internal reference material and the amount of internal reference material added, thereby improving the accuracy of the detection results. In this embodiment, the reference material can be selected from organosilicon materials.

[0035] In one implementation, please refer to the appendix. Figure 3 The optical path detection system 500 also includes a first collimating lens 502 and a first filter 503. The first collimating lens 502 and the first filter 503 are sequentially disposed at the emitting end of the laser emitting module 501. The emitted beam from the laser emitting module 501 is focused into a parallel beam by the first collimating lens 502 and filtered into a beam with a wavelength suitable for detecting ammonium dihydrogen phosphate and ammonium sulfate by the first filter 503. Furthermore, the optical path detection system 500 also includes a focusing lens 505, a second filter 509, and a second collimating lens 510. The focusing lens 505 is disposed between the dichroic mirror 504 and the galvanometer module 506. The focusing lens 505 is adapted to converge the parallel beam incident on the sample chamber 508 and to focus the divergent beam scattered by the sample in the sample chamber 508 into a parallel beam. The second filter 509 and the second collimating lens 510 are sequentially arranged on the transmission side of the dichroic mirror 504. The second filter 509 is used to filter wavelengths unrelated to ammonium dihydrogen phosphate and ammonium sulfate, and the second collimating lens 510 is used to focus the filtered light beam to the receiving end of the detection module 511. The laser beam emitted by the laser emission module 501 is reflected by the dichroic mirror 504 into the sample chamber 508. When the laser irradiates the molecules, most of the light is absorbed by the molecules and then re-emitted. This process is called scattering. In the scattered light, a small portion of the light wavelength changes; this type of scattering is called Raman scattering. The scattered light carrying spectral information is transmitted through the dichroic mirror 504 to the detection module 511, and after processing by the detection module 511, it is input into the analysis system 200.

[0036] In some implementations, please refer to the appendix. Figure 4The control circuit includes a processor 201, an encoder 206, a flash memory 202, and a dynamic memory 203. The processor 201 includes a central processing unit 2011 and a graphics processing unit 2012. The central processing unit 2011 is connected to the cooling and temperature control system 100, the laser emission module 501, and the power module 300 via a temperature control interface 204, an emission interface 205, and a power interface 208, respectively. The cooling and temperature control system 100 transmits the detected temperature signal to the control circuit. The control circuit feeds back control signals to the cooling and temperature control system 100 according to the temperature change, thereby adjusting the sample temperature. The graphics processing unit 2012 is connected to the display module 600 via a display interface 207. The graphics processing unit 2012 receives data from the central processing unit 2011, processes the data, and inputs it into the display module 600 to display the spectral image and detection data. Encoder 206 is signal-connected to the optical path detection system 500 and the central processing unit 2011, and is used to convert optical signals received from the optical path detection system 500 into electrical signals. Flash memory 202 is signal-connected to the central processing unit 2011, and is used to store the detection program and detection results running in processor 201. The detection program derives the detection results based on Raman spectroscopy analysis. Flash memory 202 also stores the detection spectra and detection results of a large number of standard samples. Dynamic memory 203 is signal-connected to the central processing unit 2011, and is used to store dynamic data generated during the operation of the detection program. The dynamic detection data can be compared with the stored detection spectra and detection results of standard samples to quickly provide the detection results.

[0037] In some embodiments, the cooling and temperature control system 100 includes a cooler and a temperature sensor, both of which are connected to the sample chamber 508 for sensing temperature. The cooler is also connected to the temperature sensor for signal transmission, and is adapted to adjust the temperature within the sample chamber 508 based on the temperature signal provided by the temperature sensor. The temperature sensor detects temperature changes in the sample within the sample chamber 508 and transmits this temperature information to a control circuit. The control circuit then controls the operation of the cooler based on these temperature changes to ensure that the sample remains within a suitable temperature range for testing.

[0038] The display module 600 includes an LED display screen mounted on the portable housing 400. Optionally, the display screen is a touch screen, allowing inspectors to directly input inspection commands on the screen.

[0039] To verify the accuracy of the portable Raman spectrometer detection in this application, multiple dry powder fire extinguishing agent samples were collected, and the presence of ammonium dihydrogen phosphate and ammonium sulfate in the samples was detected using the portable Raman spectrometer described in the embodiments of this application and the standard method, respectively.

[0040] Using the portable Raman spectrometer of this application embodiment, simply place an appropriate amount of sample into a cuvette and put it into the sample chamber 508, then seal the chamber lid. Then, click the "Detect" button on the display module. After approximately 3-30 seconds, the display module will show the detection spectrum and the percentage content (mass percentage) of ammonium dihydrogen phosphate and ammonium sulfate.

[0041] The corresponding samples were also tested for the contents of ammonium dihydrogen phosphate and ammonium sulfate using standard methods. For specific testing methods, please refer to GB 4066-2017 Dry Powder Fire Extinguishing Agents.

[0042] The test results for each sample are shown in the table below.

[0043] The above data demonstrate that the portable Raman spectrometer in this application embodiment exhibits high accuracy in detecting the content of material components. Compared to traditional detection methods, the portable Raman spectrometer in this application also has the advantage of fast response speed.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents, characterized in that, include: The portable housing, the optical path detection system, the analysis system, and the power module disposed within the portable housing, and the display module assembled with the portable housing; wherein, The optical path detection system is located on the upper part of the portable housing. It includes a laser emitting module for emitting a laser beam, a dichroic mirror positioned in the direction of the laser beam, a sample chamber positioned in the direction of the reflected light from the dichroic mirror, and a detection module positioned in the direction of the transmitted Raman spectrum from the dichroic mirror. It also includes a galvanometer module positioned between the dichroic mirror and the sample chamber. Furthermore, it includes an internal reference window and a cooling and temperature control system. The internal reference window is positioned between the galvanometer module and the sample chamber. The sample chamber is located near the upper side of the portable housing, and the cooling and temperature control system is located on the upper side of the portable housing away from the sample chamber to reduce thermal noise inside the instrument. The analysis system is located in the middle of the portable housing and includes a control circuit that is signal-connected to the laser emission module, the detection module, and the display module. The display module shows the detection interface and detection results.

2. The portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents as described in claim 1, characterized in that, The dichroic mirror is set at a 45° angle to the laser beam.

3. The portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents as described in claim 1, characterized in that, The sample chamber is adapted to hold a cuvette, and a sealable lid is provided on the sample chamber.

4. The portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents as described in claim 1, characterized in that, The optical path detection system further includes a first collimating lens and a first filter. The first collimating lens and the first filter are sequentially disposed at the emitting end of the laser emitting module. The emitted beam of the laser emitting module is focused into a parallel beam by the first collimating lens and filtered into a beam with a wavelength suitable for detecting ammonium dihydrogen phosphate and ammonium sulfate by the first filter.

5. The portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents as described in claim 1, characterized in that, The optical path detection system further includes a focusing lens, a second filter, and a second collimating lens. The focusing lens is disposed between the dichroic mirror and the galvanometer module. The focusing lens is adapted to converge a parallel beam of light directed toward the sample chamber and to converge a divergent beam of light scattered by the sample in the sample chamber into a parallel beam. The second filter and the second collimating lens are sequentially disposed on the transmission side of the dichroic mirror. The second filter is used to filter wavelengths that are not related to ammonium dihydrogen phosphate and ammonium sulfate, and the second collimating lens is used to focus the filtered light beam to the receiving end of the detection module.

6. The portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents as described in claim 1, characterized in that, The control circuit includes: The processor includes a central processing unit and a graphics processing unit. The central processing unit is connected to the cooling and temperature control system, the laser emitting module, and the power module via a temperature control interface, a transmission interface, and a power interface, respectively. The graphics processing unit is connected to the display module via a display interface. An encoder, signal-connected to the optical path detection system and the central processing unit, is used to convert optical signals received from the optical path detection system into electrical signals; A flash memory, signal-connected to the central processing unit, is used to store the detection program and detection results running in the processor, wherein the detection program derives the detection results based on Raman spectroscopy analysis; and The dynamic memory, which is signal-connected to the central processing unit, is used to store dynamic data generated during the operation of the detection program.

7. The portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents as described in claim 6, characterized in that, The refrigeration and temperature control system includes a cooler and a temperature sensor. The cooler and the temperature sensor are respectively connected to the sample chamber for sensing temperature. The cooler is connected to the temperature sensor for signal transmission. The cooler is adapted to adjust the temperature inside the sample chamber according to the temperature signal provided by the temperature sensor.

8. The portable Raman spectrometer for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents as described in claim 1, characterized in that, The display module includes an LED display screen fixed to the portable housing.

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