Portable equipment for detecting hydrogen sulfide gas in odor by photoacoustic spectrometry

Abstract

The utility model discloses portable equipment for detecting hydrogen sulfide gas in odor by using a photoacoustic spectrometry, which relates to the technical field of trace gas detection equipment and comprises a detection box main body, and a rotating shaft is mounted on the outer wall of the detection box main body. Through the arrangement of the first-stage filter, the second-stage filter, the laser, the laser modulator, the sound catcher and the PLC assembly, odor is filtered through the first-stage filter and the second-stage filter, pure hydrogen sulfide gas is obtained, then the wavelength of laser emitted by the laser is modulated into a preset wavelength through the laser modulator, and the hydrogen sulfide gas is filtered through the sound catcher. Then the modulated laser is guided into the hydrogen sulfide gas, hydrogen sulfide gas molecules are transited to an excited state, the hydrogen sulfide gas molecules vibrate and produce sound in the detection box main body, sound signals of the hydrogen sulfide gas molecules are captured through the sound capture device, the sound signals are processed through the PLC assembly, and the concentration of the trace hydrogen sulfide gas in the sample gas is rapidly calculated through the amplitude of the sound signals. The hydrogen sulfide gas concentration detection efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to micro gas detection equipment technical field, concretely is portable photoacoustic spectroscopy method detects the equipment of hydrogen sulfide gas in stench. BACKGROUND

[0002] Hydrogen sulfide is colorless, toxic, acidic gas, low concentration has a special smell of rotten egg, smell threshold: 0.00041ppm, even if low concentration hydrogen sulfide, also can damage the olfactory of person, the current common detection means is through electrochemical sensor detection hydrogen sulfide gas, but this method has some defects: electrochemical sensor can only detect ppm grade hydrogen sulfide gas, in addition, it is difficult to guarantee the accuracy of detection data under the influence of other interfering gases, therefore need portable photoacoustic spectroscopy method detects the equipment of hydrogen sulfide gas in stench.

[0003] The existing hydrogen sulfide gas detection device is easy to be disturbed by other gases during operation, for example, sulfur dioxide, carbon monoxide, hydrogen and other gases may react with the electrodes of the sensor under certain conditions, causing the sensor to make a false judgment or measurement error, and the detection efficiency is poor. Therefore, there is an urgent need for a portable photoacoustic spectroscopy method for detecting hydrogen sulfide gas in stench. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a portable photoacoustic spectroscopy method for detecting hydrogen sulfide gas in stench to solve the problem that the existing hydrogen sulfide gas detection equipment is easy to be disturbed by other gases during use, for example, sulfur dioxide, carbon monoxide, hydrogen and other gases may react with the electrodes of the sensor under certain conditions, causing the sensor to make a false judgment or measurement error, and the detection efficiency is poor.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a portable photoacoustic spectroscopy method for detecting hydrogen sulfide gas in stench, comprising a detection box main body, a rotating shaft installed on the outer wall of the detection box main body, a cover plate installed on the outer wall of the rotating shaft, a display screen installed on the outer wall of the detection box main body, an air inlet installed on the outer wall of the detection box main body, a collection pump connected to the inner wall of the air inlet, a primary filter installed on the outer wall of the collection pump, a secondary filter installed on the outer wall of the primary filter, a laser installed on the inner wall of the detection box main body, a laser modulator installed at the bottom of the laser, a sound catcher installed on the outer wall of the laser modulator, a PLC assembly installed on the outer wall of the sound catcher, and an air outlet installed on the outer wall of the detection box main body.

[0006] Preferably, the cover plate is rotatably connected to the detection box main body through the rotating shaft, and the cover plate is snap-connected to the detection box main body.

[0007] Preferably, the collecting pump is connected with the air inlet through a pipeline, and the primary filter is threadedly connected with the collecting pump.

[0008] Preferably, the laser is vertically arranged with the laser modulator, and the laser modulator is electrically connected with the sound catcher.

[0009] Preferably, the sound catcher is electrically connected with the PLC assembly, and the air outlet has the same internal diameter as the air inlet.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model discloses a primary filter, secondary filter, laser, laser modulator, sound catcher and PLC assembly are set up, and the foul smell is filtered through the primary filter and secondary filter, and the pure hydrogen sulfide gas is obtained, and then the wavelength of the laser emitted by the laser modulator is modulated into the preset wavelength, and then the modulated laser is introduced into the hydrogen sulfide gas, makes hydrogen sulfide gas molecule transition to the excited state, and the vibration sound is generated in the detection box main part, and the sound signal of hydrogen sulfide gas molecule is caught through the sound catcher, and the sound signal is handled through the PLC assembly, and the concentration of trace hydrogen sulfide gas in sample gas is calculated quickly through the amplitude of sound signal, and the hydrogen sulfide gas concentration detection efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structure schematic diagram of the front appearance of the utility model;

[0013] Figure 2 It is the structure schematic diagram of the side appearance of the utility model;

[0014] Figure 3 It is the structure schematic diagram of the internal section of the utility model;

[0015] Figure 4 It is the structure schematic diagram of the internal component split display of the utility model.

[0016] In the drawing: 1, detection box main part;2, pivot;3, cover plate;4, display screen;5, air inlet;6, collecting pump;7, primary filter;8, secondary filter;9, laser;10, laser modulator;11, sound catcher;12, PLC assembly;13, air outlet. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings of the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are used only for explaining the utility model, and cannot be understood as limiting the utility model.

[0018] The embodiments are described below according to the overall structure of the utility model.

[0019] Please refer to Figures 1-4 The equipment for detecting hydrogen sulfide gas in odor by portable photoacoustic spectroscopy comprises a detection box body 1, a rotating shaft 2 installed on the outer wall of the detection box body 1, a cover plate 3 installed on the outer wall of the rotating shaft 2, a display screen 4 installed on the outer wall of the detection box body 1, an air inlet 5 installed on the outer wall of the detection box body 1, a collection pump 6 connected to the inner wall of the air inlet 5, a primary filter 7 installed on the outer wall of the collection pump 6, a secondary filter 8 installed on the outer wall of the primary filter 7, a laser 9 installed on the inner wall of the detection box body 1, a laser modulator 10 installed at the bottom of the laser 9, a sound catcher 11 installed on the outer wall of the laser modulator 10, a PLC assembly 12 installed on the outer wall of the sound catcher 11, an air outlet 13 installed on the outer wall of the detection box body 1, and the cover plate 3 and the detection box body 1 constitute a rotating structure through the rotating shaft 2, and the cover plate 3 is connected with the detection box body 1 in a clamping manner, the collection pump 6 and the air inlet 5 are connected through a pipeline, the primary filter 7 is threadedly connected with the collection pump 6, the laser 9 and the laser modulator 10 are arranged in a perpendicular manner, the laser modulator 10 is electrically connected with the sound catcher 11, the sound catcher 11 is electrically connected with the PLC assembly 12, and the air outlet 13 and the air inlet 5 have the same internal diameter size. The air inlet 5, the collection pump 6, the primary filter 7, the secondary filter 8, the laser 9, the laser modulator 10, the sound catcher 11, the PLC assembly 12 and the air outlet 13 are arranged, the odor is filtered through the primary filter 7 and the secondary filter 8 to obtain pure hydrogen sulfide gas, the wavelength of the laser emitted by the laser 9 is modulated into a preset wavelength by the laser modulator 10, the modulated laser is introduced into the hydrogen sulfide gas, the hydrogen sulfide gas molecules are transitioned to an excited state, the hydrogen sulfide gas molecules vibrate and make sound in the detection box body 1, the sound signal of the hydrogen sulfide gas molecules is captured by the sound catcher 11, the sound signal is processed by the PLC assembly 12, the concentration of trace hydrogen sulfide gas in the sample gas is quickly calculated according to the amplitude of the sound signal, and the efficiency of hydrogen sulfide gas concentration detection is improved.

[0020] Working principle: in use, first of all, the device is moved to the desired position, then through the air inlet 5 into the odor and through the collection pump 6, and then the odor into the primary filter 7 for preliminary filtration, then through the secondary filter 8 to remove moisture and ammonia and other organic compounds gas, get dry pure hydrogen sulfide gas, then use the laser modulator 10 to modulate the wavelength of the laser emitted by the laser 9 into a preset wavelength, then the modulated laser is introduced into the pure hydrogen sulfide gas, the modulated laser can make the hydrogen sulfide gas molecules transition to the excited state, the hydrogen sulfide gas molecules in the excited state will vibrate and make sound in the detection box main body 1, then the sound catcher 11 captures the sound signal emitted by the hydrogen sulfide gas molecules, and sends the captured sound signal to the PLC component 12, processes the sound signal through the PLC component 12, calculates the amplitude of the sound signal, because the amplitude of the sound signal and the concentration of trace hydrogen sulfide gas are in direct proportion, the PLC component 12 can calculate the concentration of trace hydrogen sulfide gas in the sample gas according to the amplitude of the sound signal and the direct proportion, then the display screen 4 directly displays the detection data, because the conversion of the above photoacoustic signal and the conversion of the acoustoelectric signal are relatively rapid, so it can improve the efficiency of trace hydrogen sulfide gas concentration detection, finally, after the detection is completed, the cover plate 3 is rotated along the shaft 2 and closed and sealed with the detection box main body 1, so the use process of the device is completed, the contents not described in detail in the specification belong to the existing technology known to those skilled in the art.

[0021] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A portable photoacoustic spectroscopy device for detecting hydrogen sulfide gas in odorous gases, comprising a detection chamber body (1), characterized in that: A rotating shaft (2) is installed on the outer wall of the main body (1) of the detection box. A cover plate (3) is installed on the outer wall of the rotating shaft (2). A display screen (4) is installed on the outer wall of the main body (1). An air inlet (5) is installed on the outer wall of the main body (1). A collection pump (6) is connected to the inner wall of the air inlet (5). A primary filter (7) is installed on the outer wall of the collection pump (6). A secondary filter (8) is installed on the outer wall of the primary filter (7). A laser (9) is installed on the inner wall of the main body (1). A laser modulator (10) is installed at the bottom of the laser (9). A sound capture device (11) is installed on the outer wall of the laser modulator (10). A PLC assembly (12) is installed on the outer wall of the sound capture device (11). An air outlet (13) is installed on the outer wall of the main body (1).

2. The portable photoacoustic spectroscopy device for detecting hydrogen sulfide gas in odorous gases according to claim 1, characterized in that: The cover plate (3) forms a rotating structure with the detection box body (1) through the rotating shaft (2), and the cover plate (3) and the detection box body (1) are engaged and connected.

3. The portable photoacoustic spectroscopy device for detecting hydrogen sulfide gas in odorous gases according to claim 1, characterized in that: The sampling pump (6) is connected to the air inlet (5) through a pipe, and the primary filter (7) is threadedly connected to the sampling pump (6).

4. The portable photoacoustic spectroscopy device for detecting hydrogen sulfide gas in odorous gases according to claim 1, characterized in that: The laser (9) is arranged perpendicularly to the laser modulator (10), and the laser modulator (10) is electrically connected to the sound capture device (11).

5. The portable photoacoustic spectroscopy device for detecting hydrogen sulfide gas in odorous gases according to claim 1, characterized in that: The sound capture device (11) is electrically connected to the PLC component (12), and the air outlet (13) has the same internal diameter as the air inlet (5).

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