Light path system for simultaneously detecting ammonium dihydrogen phosphate content and ammonium sulfate content in dry powder extinguishing agent by Raman spectroscopy

Abstract

The utility model provides a light path system for simultaneously detecting ammonium dihydrogen phosphate content and ammonium sulfate content in a dry powder extinguishing agent by a Raman spectrum method, which comprises a laser, a Raman spectrum detection module, a dichroscope and a galvanometer module, and the Raman spectrum detection module is used for generating a Raman spectrum according to the received Raman signal and analyzing the detection sample. The dichroscope is used for reflecting the laser beam to the sample cell and transmitting the Raman spectrum of the sample to be detected in the sample cell to the Raman spectrum detection module. The galvanometer module is arranged on the side, receiving the laser beams, of the sample pool and used for accurately controlling laser spots to conduct multi-point scanning on the surface of the sample. According to the utility model, the galvanometer module is arranged on one side of the sample pool for receiving the laser beam, and can realize rapid and comprehensive multi-point scanning on the sample, so that the Raman spectrum of the sample can be accurately obtained, and the accuracy of a detection result is ensured.

Description

Technical Field

[0001] This invention belongs to the field of Raman spectroscopy detection, specifically relating to an optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents using Raman spectroscopy. Background Technology

[0002] 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.

[0003] 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.

[0004] To meet the needs of rapid on-site determination, there is an urgent need for a portable device suitable for rapid on-site detection, capable of simultaneously detecting the content of ammonium dihydrogen phosphate and ammonium sulfate. Raman spectroscopy is a spectroscopic analysis method based on light scattering. By measuring and analyzing Raman spectra, important information about the molecular structure, chemical bond state, and intermolecular interactions of substances can be obtained, making it suitable for rapid detection of sample components. However, due to the uneven distribution of powdered samples in the sample cell, the detection results are highly biased, and generally, portable Raman spectrometers are not suitable for the detection of dry powder fire extinguishing agents. Utility Model Content

[0005] This invention provides an optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents using Raman spectroscopy, aiming to improve the detection accuracy of the equipment while satisfying portability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: to provide an optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents using Raman spectroscopy, comprising:

[0007] A laser and a Raman spectroscopy detection module, wherein the laser is used to emit a laser beam, and the Raman spectroscopy detection module is used to generate a Raman spectrum based on the received Raman signal and analyze the sample for detection;

[0008] A dichroic mirror is used to reflect the laser beam to the sample cell and transmit the Raman spectrum of the sample to be tested within the sample cell to the Raman spectroscopy detection module; and

[0009] A galvanometer module is located on the side of the sample cell that receives the laser beam, and is used to precisely control the laser spot to perform multi-point scanning on the sample surface.

[0010] In this embodiment, a galvanometer module is provided on one side of the sample cell that receives the laser beam. The galvanometer module can realize rapid and comprehensive multi-point scanning of the sample, ensuring that the Raman spectrum of the sample can be accurately obtained and guaranteeing the accuracy of the detection results.

[0011] In one embodiment, the dichroic mirror forms a 45° angle with the laser beam emitted by the laser.

[0012] The galvanometer module and the sample cell are arranged on the reflecting side of the dichroic mirror;

[0013] The Raman spectroscopy detection module is installed on the transmission side of the dichroic mirror;

[0014] The Raman spectroscopy detection module and the galvanometer module are arranged on the same straight line and perpendicular to the laser beam emitted by the laser.

[0015] In one embodiment, a reflector is further included at a 45° angle to the laser beam emitted by the laser, the reflector being used to reflect the laser beam onto the dichroic mirror;

[0016] The dichroic mirror is arranged parallel to the reflecting mirror. The galvanometer module and the sample cell are arranged on the reflecting side of the dichroic mirror, and the Raman spectroscopy detection module is arranged on the transmitting side of the dichroic mirror.

[0017] The Raman spectroscopy detection module and the galvanometer module are arranged on the same straight line and parallel to the laser beam emitted by the laser.

[0018] In one embodiment, the laser emitter is provided with a first collimating lens and a first filter in sequence. The laser beam emitted by the laser is focused into a parallel beam by the first collimating lens and filtered by the first filter to a wavelength suitable for detecting ammonium dihydrogen phosphate and ammonium sulfate.

[0019] In one embodiment, a focusing mirror is disposed between the dichroic mirror and the galvanometer, the focusing mirror being adapted to converge a parallel beam of light directed toward the sample cell and to modulate a divergent beam of light scattered by the sample in the sample cell into a parallel beam.

[0020] The transmission side of the dichroic mirror is provided with a second filter and a second collimating lens in sequence. The second filter is used to filter scattered light other than ammonium dihydrogen phosphate and ammonium sulfate, and the second collimating lens is used to focus the filtered scattered light to the receiving end of the Raman spectroscopy detection module.

[0021] In one embodiment, an internal reference window is provided between the galvanometer module and the sample cell.

[0022] In this embodiment of the application, an internal reference window is set in the detection system. By using the internal reference as a benchmark for the analysis of detection data, the detection results can be verified more accurately.

[0023] In one embodiment, the first filter is a narrowband filter.

[0024] In one embodiment, the second filter is a long-pass filter. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents according to Example 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents according to Example 2 of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 01-Laser; 02-First collimating lens; 03-First filter; 04-Reflecting mirror; 05-Dichroic mirror; 06-Focusing mirror; 07-Galvanometer module; 08-Internal reference window; 09-Sample cell; 10-Second filter; 11-Second collimating lens; 12-Raman spectroscopy detection module. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 the present invention 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 the present invention.

[0032] 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 invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Existing detection methods, such as the molybdenum-antimony spectrophotometric method, the malachite green-phosphomolybdic acid heteropolyacid spectrophotometric method, and the quinoline phosphomolybdate gravimetric method, are cumbersome and time-consuming, failing to meet the needs of rapid on-site detection. Traditional Raman detectors scan samples by moving the detection beam on a plane using a stepper motor or handheld adjustment. However, stepper motors suffer from insufficient step accuracy to meet scanning precision requirements, easily leading to optical system drift and preventing comprehensive and accurate sample scanning. Handheld scanning is even more difficult to control in terms of accuracy. This application provides an optical path system for simultaneously detecting ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents using Raman spectroscopy. This system allows for precise and rapid comprehensive scanning of the sample by adjusting the movement path of the detection beam via a galvanometer module. The scanning path completely covers the sample, offering high detection accuracy and a simple and convenient operation.

[0034] Please refer to the attached document as well. Figure 1 and attached Figure 2The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents provided by this utility model is described below. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents includes a laser 01, a Raman spectroscopy detection module 12, a dichroic mirror 05, and a galvanometer module 07. The laser beam emitted by the laser 01 is reflected by the dichroic mirror 05 and enters the galvanometer module 07. The galvanometer module 07 controls the laser beam to perform multi-point scanning of the sample in the sample cell 09. The reflected beam from the sample passes through the dichroic mirror 05 and is received and analyzed by the Raman spectroscopy detection module 12. Specifically, the laser 01 is used to emit a laser beam, and the Raman spectroscopy detection module 12 is used to generate a Raman spectrum based on the received Raman signal and analyze the sample. The dichroic mirror 05 is used to reflect the laser beam to the sample cell 09 and transmit the Raman spectrum of the sample to be tested in the sample cell 09 to the Raman spectroscopy detection module 12. The galvanometer module 07 is located on one side of the sample cell 09 that receives the laser beam, and is used to precisely control the laser spot to perform multi-point scanning on the sample surface.

[0035] In this embodiment, the detection beam is controlled by the galvanometer module 07 to accurately scan the sample. The beam scanning path can achieve full coverage of the sample, accurately obtain the Raman spectral information of all samples, ensure the accuracy of the detection results, and overcome the technical barrier that Raman spectroscopy cannot be applied to the detection of solid samples in the prior art.

[0036] In one specific implementation, please refer to the appendix. Figure 1 The detection beam emitted by laser 01 forms a 90° angle with the sample-reflected beam. Specifically, the positional relationships of the optical path components are as follows: the dichroic mirror 05 forms a 45° angle with the laser beam emitted by laser 01. A galvanometer module 07 and a sample cell 09 are arranged on the reflecting side of the dichroic mirror 05. A Raman spectroscopy detection module 12 is arranged on the transmitting side of the dichroic mirror 05. The Raman spectroscopy detection module 12 and the galvanometer module 07 are arranged on the same straight line and perpendicular to the laser beam emitted by laser 01.

[0037] In another specific implementation, please refer to the appendix. Figure 2 The detection beam emitted by laser 01 is parallel to the sample-reflected beam. Specifically, the positional relationship of each optical path component is as follows: The optical path system also includes a reflector 04 at a 45° angle to the laser beam emitted by laser 01. The reflector 04 is used to reflect the laser beam onto a dichroic mirror 05. The dichroic mirror 05 is arranged parallel to the reflector 04. A galvanometer module 07 and a sample cell 09 are arranged on the reflecting side of the dichroic mirror 05, and a Raman spectroscopy detection module 12 is arranged on the transmitting side of the dichroic mirror 05. The Raman spectroscopy detection module 12 and the galvanometer module 07 are arranged on the same straight line and parallel to the laser beam emitted by laser 01.

[0038] Based on the above embodiments, furthermore, the emitting end of the laser 01 is sequentially provided with a first collimating lens 02 and a first filter 03. The laser beam emitted by the laser 01 is focused into a parallel beam by the first collimating lens 02 and filtered by the first filter 03 to a wavelength suitable for detecting ammonium dihydrogen phosphate and ammonium sulfate. Specifically, the first filter 03 is a narrowband filter.

[0039] Furthermore, a focusing mirror 06 is disposed between the dichroic mirror 05 and the galvanometer. The focusing mirror 06 is adapted to converge the parallel light beam incident on the sample cell 09 and to modulate the divergent light beam scattered by the sample in the sample cell 09 into a parallel beam. A second filter 10 and a second collimating mirror 11 are sequentially disposed on the transmission side of the dichroic mirror 05. The second filter 10 is used to filter scattered light other than ammonium dihydrogen phosphate and ammonium sulfate, and the second collimating mirror 11 is used to converge the filtered scattered light to the receiving end of the Raman spectroscopy detection module 12. Specifically, the second filter 10 is a long-pass filter.

[0040] In one embodiment, an internal reference window 08 is provided between the galvanometer module 07 and the sample cell 09.

[0041] In this embodiment of the application, an internal reference window 08 is added. By detecting the internal reference substance together with the sample, errors caused by various factors such as sample processing, instrument accuracy, and operation methods during the experiment can be corrected. By comparing the signal intensity or content of the internal reference and the target substance, the true content of ammonium dihydrogen phosphate and ammonium sulfate in the sample can be reflected more accurately, thereby improving the accuracy of detection.

[0042] The optical path system provided by this invention for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agents using Raman spectroscopy can rapidly determine the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agent samples by adding a galvanometer module and an internal reference window.

[0043] The contents of ammonium dihydrogen phosphate and ammonium sulfate in the corresponding samples were also tested using standard methods. For specific testing methods, please refer to GB 4066-2017 Dry Powder Fire Extinguishing Agents.

[0044] The test results for each sample are shown in the table below.

[0045]

[0046]

[0047]

[0048] 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 light path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agent by Raman spectroscopy, characterized by comprising: The application relates to a laser and Raman spectrum detection module, a dichroic mirror and a galvanometer module. The laser is used for emitting a laser beam, the Raman spectrum detection module is used for generating a Raman spectrum according to a received Raman signal and analyzing a detected sample; The dichroic mirror is used for reflecting the laser beam to a sample cell and transmitting a Raman spectrum of a sample to be detected in the sample cell to the Raman spectrum detection module. The galvanometer module is arranged on one side of the sample cell receiving the laser beam and is used for precisely controlling a laser spot to perform multi-point scanning on a sample surface. The dichroic mirror and the laser beam emitted by the laser are at an angle of 45 degrees.

2. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agent by Raman spectroscopy according to claim 1, characterized by, The galvanometer module and the sample cell are arranged on the reflection side of the dichroic mirror. The Raman spectrum detection module is arranged on the transmission side of the dichroic mirror. The Raman spectrum detection module and the galvanometer module are arranged on the same straight line and are perpendicular to the laser beam emitted by the laser. A mirror is further arranged and is at an angle of 45 degrees with the laser beam emitted by the laser.

3. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agent by Raman spectroscopy according to claim 1, characterized by, The mirror is used for reflecting the laser beam to the dichroic mirror. The dichroic mirror and the mirror are arranged in parallel. The galvanometer module and the sample cell are arranged on the reflection side of the dichroic mirror.

4. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agent by Raman spectroscopy according to any one of claims 1 to 3, characterized in that, The Raman spectrum detection module is arranged on the transmission side of the dichroic mirror. The Raman spectrum detection module and the galvanometer module are arranged on the same straight line and are parallel to the laser beam emitted by the laser. The emission end of the laser is sequentially provided with a first collimating mirror and a first filter. The laser beam emitted by the laser is converged into a parallel beam through the first collimating mirror and is filtered into a wavelength suitable for detecting ammonium dihydrogen phosphate and ammonium sulfate through the first filter.

6. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder fire extinguishing agent by Raman spectroscopy according to any one of claims 1 to 3, characterized in that, 5. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in dry powder extinguishing agents by Raman spectroscopy according to any one of claims 1-3, wherein:

7. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in a dry powder fire extinguishing agent by Raman spectroscopy according to claim 4, characterized by, A focusing mirror is arranged between the dichroic mirror and the galvanometer.

8. The optical path system for simultaneously detecting the contents of ammonium dihydrogen phosphate and ammonium sulfate in a dry powder fire extinguishing agent by Raman spectroscopy according to claim 5, wherein The focusing mirror is suitable for converging the parallel beam towards the sample cell and modulating the divergent beam scattered by the sample in the sample cell into a parallel beam. A second filter and a second collimating mirror are sequentially arranged on the transmission side of the dichroic mirror. The second filter is used for filtering scattered light other than ammonium dihydrogen phosphate and ammonium sulfate. The second collimating mirror is used for converging the filtered scattered light to the receiving end of the Raman spectrum detection module. A reference window is further arranged between the galvanometer module and the sample cell. The first filter is a narrow-band filter. The second filter is a long-pass filter.

Images