Signal transmission structure of gas detection infrared optical platform

Abstract

A signal transmission structure of a gas detection infrared optical platform relates to the technical field of photoelectric detection and comprises a detection tube, an amplification circuit and a memory, the detection tube is used for generating a corresponding voltage change signal according to the light intensity change of the infrared light passing through the to-be-detected gas; the amplification circuit is used for performing multi-stage amplification processing on the voltage change signal; the memory is used for receiving and storing the amplified voltage change signal; the infrared optics can obtain an accurate detection result.

Description

Technical Field

[0001] The utility model relates to the technical field of photoelectric detection, in particular to a signal transmission structure of a gas detection infrared optical platform. Background Art

[0002] Because automobile exhaust contains some pollutants, it is necessary to test automobile exhaust for environmental health and safety, so as to screen out vehicles that do not meet emission requirements. In addition, traditional gas detection methods include chemical analysis and electrochemical sensor methods, but these methods often have problems such as complex operation, long response time or poor selectivity.

[0003] Currently, non-spectral infrared gas detection is commonly used to detect the content of pollutants in automobile exhaust. Although this method can obtain the content of pollutants in the gas through specific sensors, the sensor generally obtains a weak continuous signal. If it is not processed, the signal is easily lost during the transmission process, resulting in inaccurate gas detection results and affecting the actual judgment of whether the automobile emissions are qualified.

[0004] Therefore, we propose an infrared optical platform with accurate detection results. Utility Model Content

[0005] In order to overcome the deficiencies in the background technology, the utility model discloses a signal transmission structure of a gas detection infrared optical platform.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0007] A signal transmission structure for a gas detection infrared optical platform includes a detection tube, an amplifier circuit, and a memory; the detection tube is used to generate a corresponding voltage change signal according to the change in light intensity of infrared light after passing through the gas to be detected;

[0008] The amplifier circuit is used to perform multi-stage amplification processing on the voltage change signal;

[0009] The memory is used to receive and store the amplified voltage change signal.

[0010] Preferably, the detection tube comprises a tube body, a light source and a sensor, wherein the tube body is used to pass the gas to be tested;

[0011] The light source is used to emit infrared light that can penetrate the gas to be measured;

[0012] The sensor is used to receive infrared light with changed light intensity and convert it into a corresponding voltage change signal.

[0013] Preferably, the sensor generates two voltage change signals, wherein the first voltage change signal is generated when infrared light passes through pollutants in the gas to be measured;

[0014] The second voltage change signal is generated when the infrared light passes through water molecules in the gas to be measured.

[0015] Preferably, the amplifying circuit includes a first amplifying loop and a second amplifying loop, wherein the first amplifying loop is used to receive and amplify the first voltage change signal; and the second amplifying loop is used to receive and amplify the second voltage change signal.

[0016] Preferably, the first amplifying loop and the second amplifying loop are both composed of a plurality of amplifiers, wherein the plurality of amplifiers in any amplifying loop are sequentially connected in series.

[0017] Preferably, the number of amplifiers in the two amplification loops is set to four.

[0018] Preferably, the sensor adopts multi-channel NDIR.

[0019] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0020] The utility model discloses a signal transmission structure for a gas detection infrared optical platform. The amplifier circuit performs multi-stage amplification processing on the voltage change signal, thereby effectively improving the intensity of the voltage change signal, thereby reducing the amount of voltage change signal loss, ensuring that the subsequent memory can receive the complete voltage change signal, and thus improving the accuracy of the final gas detection result.

[0021] In addition, the detection tube can detect two voltage change signals at the same time, thereby further improving the accuracy of the gas detection results by performing a comprehensive analysis of the two voltage change signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A structural diagram of the utility model;

[0023] Figure 2 It is a structural diagram of the amplifier circuit.

[0024] In the figure: 1. Detection tube; 11. Tube body; 12. Light source; 13. Sensor; 2. Amplification circuit; 21. First amplification loop; 22. Second amplification loop; 3. Memory. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely corresponding to the drawings of the present invention and are for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction.

[0026] Example 1 is:

[0027] Combined with attachment Figure 1 The signal transmission structure of the gas detection infrared optical platform includes a detection tube 1, an amplifying circuit 2, and a memory 3. The detection tube 1 is used to generate a voltage change signal corresponding to the change in infrared light after passing through the gas to be detected. That is, when infrared light passes through the gas to be detected, it is absorbed or blocked by pollutant particles of different components in the gas to be detected, causing the infrared light spectrum received by the sensor 13 to change. The sensor 13 then converts the corresponding spectral change into a voltage change signal.

[0028] The amplifier circuit 2 is used to perform multi-stage amplification processing on the voltage change signal; the multi-stage amplification processing can effectively increase the strength of the voltage change signal, thereby reducing the loss of the voltage change signal, ensuring that the subsequent memory 3 can receive the complete voltage change signal, thereby improving the accuracy of the final gas detection result;

[0029] The memory 3 is used to receive and store the amplified voltage change signal; the memory 3 can store the amplified voltage change signal, and then transmit it to an external cloud computing platform in real time to analyze the amplified voltage change signal, and then present it to the staff through the display, so that the staff can clearly understand the content of pollutants in the current gas to be tested, and then the staff can determine whether to intercept the vehicle emitting the gas to be tested for re-inspection.

[0030] Example 2 is:

[0031] Based on Example 1, the detection tube 1 is further defined as comprising a tube body 11, a light source 12, and a sensor 13, wherein the tube body 11 is used to pass the gas to be measured; and the outer wall of the tube body 11 may be provided with an air inlet and an air outlet structure to allow the gas to be measured to enter the tube body 11;

[0032] As needed, two sections of the tube body 11 can be provided and connected by a telescopic mechanism, so that the overall length of the tube body 11 can be adjusted according to actual conditions. Specifically, the butt ends of the two sections of the tube body 11 are sealed and nested, and a telescopic push rod is fixedly provided on the tube wall of one section of the tube body 11. The movable end of the telescopic push rod is fixedly connected to the tube wall of the other section of the tube body 11. Thus, the telescopic action of the telescopic push rod can drive the two sections of the tube body 11 to move toward or away from each other, thereby realizing the telescopic action of the entire tube body 11.

[0033] The light source 12 is used to emit infrared light that can penetrate the gas to be measured. The light source 12 can be a controllable blackbody light source, which only works to emit infrared light when light is needed. In addition, because the signal radiation of this light source is smaller than that of traditional light sources (approximately 1 / 80), a multi-stage amplification circuit is required to make the light signal easy to identify and perform subsequent processing.

[0034] The sensor 13 is used to receive infrared light that passes through the gas to be measured and convert the infrared light into a corresponding voltage change signal. Furthermore, for automobile exhaust, CO2 is currently considered to be a common pollutant. Therefore, the sensor 13 uses a multi-channel NDIR. By setting different filters in different channels, the sensor 13 can obtain the spectrum of infrared light after passing through different gas pollutants and the corresponding voltage change signals.

[0035] It should be noted that the light source 12 , the tube body 11 and the sensor 13 should be located on the same optical center axis.

[0036] Example 3 is:

[0037] On the basis of Example 2, combined with the attached Figure 2 , further defining the sensor 13, wherein the sensor 13 generates two voltage change signals, wherein the first voltage change signal is generated by the infrared light passing through the contaminants in the gas to be measured; that is, when the infrared light passes through the gas to be measured, a portion of the light is absorbed by the contaminants therein, causing the infrared light detected by the sensor 13 to have a certain change compared to the infrared light emitted by the original light source 11, and this change is converted by the sensor 13 into the first voltage change signal;

[0038] The second voltage change signal is generated by infrared light passing through water molecules in the gas to be measured; the principle of this voltage change signal is the same as that of the first voltage change signal;

[0039] Therefore, specifically, when analyzing the pollutant content in the gas to be tested, the second voltage change signal plays a role in reducing errors. Because automobile exhaust generally contains a lot of water, the first voltage change signal converted and generated by the sensor 13 will inevitably produce certain errors due to water molecules. However, due to the comparison and evidence of the second voltage change signal, the error in the first voltage change signal can be eliminated, thereby accurately judging the pollutant content in the gas to be tested, that is, the CO2 content in the gas to be tested.

[0040] Furthermore, the amplifier circuit 2 includes a first amplifier circuit 21 and a second amplifier circuit 22. The first amplifier circuit 21 is used to receive and amplify the first voltage change signal; the second amplifier circuit 22 is used to receive and amplify the second voltage change signal. Because the voltage signal output by the infrared detector is very weak, typically in the tens of millivolts, weak signals are easily interfered with, thus affecting detection accuracy. A feedback-type three-stage amplifier circuit is employed, featuring a high-precision, low-drift, and fast-response amplifier circuit design. Through signal amplification and processing, an analog signal linearly corresponding to the gas concentration is generated. Furthermore, by matching the op amp's adjustable resistor, calibration of the detection range and drift is achieved.

[0041] As needed, the first amplification loop 21 and the second amplification loop 22 are both composed of multiple amplifiers, wherein the multiple amplifiers in any amplification loop are arranged in series in sequence, that is, the first amplification loop 21 and the second amplification loop 22 respectively perform multi-stage amplification on the first voltage change signal and the second voltage change signal, which can avoid mutual interference between the first voltage change signal and the second voltage change signal during the amplification process, and further improve the accuracy of the detected voltage change signal.

[0042] Specifically, the number of amplifiers in the two amplification loops is set to four, the four amplifiers are arranged in series in sequence, and the power supplies of the four amplifiers are all powered by an external isolated power supply. The third and fourth amplifiers in the first amplification loop 21 and the second amplification loop 22 are also respectively provided with filtering circuits to further ensure the quality of the amplified signal.

[0043] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A signal transmission structure for a gas detection infrared optical platform, characterized by: It comprises a detection tube (1), an amplifying circuit (2) and a memory (3); the detection tube (1) is used to generate a corresponding voltage change signal according to the change in light intensity of infrared light after passing through the gas to be detected; The amplifier circuit (2) is used to perform multi-stage amplification processing on the voltage change signal; The amplifying circuit (2) comprises a first amplifying loop (21) and a second amplifying loop (22), wherein the first amplifying loop (21) is used to receive and amplify a first voltage change signal; and the second amplifying loop (22) is used to receive and amplify a second voltage change signal. The first amplifying loop (21) and the second amplifying loop (22) are both composed of a plurality of amplifiers, wherein the plurality of amplifiers in any amplifying loop are sequentially connected in series; The number of amplifiers in the two amplification loops is set to four; The memory (3) is used to receive and store the amplified voltage change signal.

2. The signal transmission structure of the infrared optical platform for gas detection according to claim 1, characterized in that: The detection tube (1) comprises a tube body (11), a light source (12) and a sensor (13), wherein the tube body (11) is used to pass the gas to be tested; The light source (12) is used to emit infrared light that can penetrate the gas to be measured; The sensor (13) is used to receive infrared light after light intensity changes and convert it into a corresponding voltage change signal.

3. The signal transmission structure of the infrared optical platform for gas detection according to claim 2, characterized in that: The sensor (13) generates two voltage change signals, wherein the first voltage change signal is generated when infrared light passes through pollutants in the gas to be measured; The second voltage change signal is generated when the infrared light passes through water molecules in the gas to be measured.

4. The signal transmission structure of the infrared optical platform for gas detection according to claim 3, characterized in that: The sensor (13) adopts multi-channel NDIR.

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