CN115144338A - Optical gas detector and working method thereof - Google Patents

Abstract

The invention relates to the technical field of gas detection, and aims to provide an optical gas detector and a working method thereof. The optical gas detector comprises a main control module, a first detection module, a second detection module, a wireless communication module and a data storage module, wherein the first detection module, the second detection module, the wireless communication module and the data storage module are respectively in communication connection with the main control module; the first detection module comprises a first light source emitting module and a first light receiving module which are respectively in communication connection with the main control module, and the second detection module comprises a second light source emitting module and a second light receiving module which are respectively in communication connection with the main control module. The invention can realize on-line monitoring of gas concentration and has high monitoring precision.

Description

Optical gas detector and working method thereof

Technical Field

The invention relates to the technical field of gas detection, in particular to an optical gas detector and a working method thereof.

Background

The optical gas detector is a detector for detecting gas concentration based on an optical principle, comprises a light ray gas sensor, an ultraviolet ray gas sensor and the like, and has the remarkable advantages of high precision, good selectivity, high reliability, no poisoning, no dependence on oxygen, small environmental interference factor, long service life and the like. The core component of the optical gas detector is a gas sensor, and in the using process of the optical gas detector, the gas sensor detects the concentration of gas by measuring the absorbed energy of light rays by using the difference of the absorption degrees of different gases to the light rays.

However, in the process of using the prior art, the inventor finds that at least the following problems exist in the prior art:

in the use process of the optical gas detector in the prior art, a user is usually required to manually read gas concentration detection data, online monitoring cannot be performed, and the problem of high maintenance cost exists; meanwhile, the current optical gas detector is generally only provided with a group of detection modules, and the aging and attenuation of a light source can cause the detection precision of gas concentration to be lower and even cause the failure that the detection cannot be carried out.

Disclosure of Invention

In order to solve the technical problem at least to a certain extent, the invention provides an optical gas detector and a working method thereof.

The technical scheme adopted by the invention is as follows:

an optical gas detector comprises a main control module, a first detection module, a second detection module, a wireless communication module and a data storage module, wherein the first detection module, the second detection module, the wireless communication module and the data storage module are respectively in communication connection with the main control module; the first detection module comprises a first light source emitting module and a first light receiving module which are respectively in communication connection with the main control module, light emitted by the first light source emitting module penetrates to a first detection space and then is received by the first light receiving module, the second detection module comprises a second light source emitting module and a second light receiving module which are respectively in communication connection with the main control module, and light emitted by the second light source emitting module penetrates to a second detection space and then is received by the second light receiving module.

The invention can realize on-line monitoring of gas concentration and has high monitoring precision. Specifically, in the using process of the gas concentration monitoring device, the main control module can detect the gas concentration based on the signal transmitted by the first light receiving module in the first detection module, and can wirelessly transmit the gas concentration data to be detected to a preset server through the wireless communication module after the gas concentration to be detected is obtained, so that a user can realize the online monitoring of the gas concentration, and the maintenance cost is reduced; in addition, in the implementation process of the invention, the second detection module can be used as a detection reference, and the light emitted by the second light source emitting module does not react with the gas to be detected and directly irradiates the second light receiving module to form an independent light path, so as to filter the influence of environmental factors such as temperature, humidity and dust on the measurement precision; the first detection module is used for measuring gas to be detected, light emitted by the first light source emitting module can be projected into the first detection space to act with the gas to be detected in the first detection space, an independent light path is formed until the light is received by the first light receiving module, and due to the arrangement of the second detection module, the detection accuracy of gas concentration can be improved.

In one possible design, the optical gas detector further includes an OTA upgrade module communicatively coupled to the main control module.

In a possible design, the optical gas detector further comprises a heating module and a temperature and humidity detection module, the heating module is used for heating the first detection space and the second detection space, the temperature and humidity detection module is in communication connection with the main control module, and the temperature and humidity detection module is used for measuring temperature and humidity data in the first detection space and the second detection space and sending the temperature and humidity data to the main control module.

In a possible design, first light source emission module with second light source emission module all includes light emitter, light source drive module, polarity electric capacity, first resistance, N type MOS pipe and second resistance, light source drive module model be TMI8118, 1 foot and 6 feet of light source drive module respectively with the both ends of light emitter are connected, 2 feet of light source drive module are through first resistance ground connection, 2 feet of light source drive module still respectively with the drain electrode electricity of host system and N type MOS pipe is connected, the source electrode ground connection of N type MOS pipe, the grid of N type MOS pipe with the host system electricity is connected, the grid of N type MOS pipe still is through second resistance ground connection, 5 feet of light source drive module respectively with the positive pole of polarity electric capacity and power output end electricity are connected, the negative pole ground connection of polarity electric capacity, 3 feet and 4 feet of light source drive module all are connected with the host system electricity.

In a possible design, the first light receiving module and the second light receiving module respectively comprise a light receiver, a first signal amplification module and a second signal amplification module which are sequentially connected, and the output end of the second signal amplification module is electrically connected with the main control module.

In a possible design, the optical gas detector further includes a base and a dust cover disposed on the top of the base, the dust cover is provided with an air inlet and an air outlet in a communicating manner, a baffle is disposed between the base and the dust cover, the baffle separates the base from the dust cover, a space located above the baffle and in the dust cover constitutes the first detection space, and a space located below the baffle and in the base constitutes the second detection space.

In a possible design, the baffle adopts the light-passing board, first survey the module with the module is surveyed to the second all sets up in the base, just first light source emission module and first light receiving module in the first survey module all set up towards the baffle, the dust cover is kept away from the one end of baffle is provided with the speculum, so that the light that first light source emission module sent wears to by behind the first detection space the speculum reflects to first light receiving module, second light source emission module with second light receiving module sets up relatively.

An operating method of an optical gas detector comprises a calibration method, wherein the calibration method comprises the following steps:

under the condition of no gas to be detected, when the temperature is T0, acquiring a signal DA0 transmitted by the first light receiving module and a signal DB0 transmitted by the second light receiving module, and then storing the gas concentration 0, the temperature T0, the signal DA0 and the signal DB0 as first calibration data into the data storage module;

under the condition that the concentration of the detected gas is N1, when the temperature is T0, acquiring a signal DA1 transmitted by the first light receiving module and a signal DB1 transmitted by the second light receiving module, and then storing the gas concentration N1, the temperature T0, the signal DA1 and the signal DB1 as second calibration data into the data storage module;

under the condition that the concentration of the detected gas is N1, when the temperature is T1, the signal DA2 transmitted by the first light receiving module and the signal DB2 transmitted by the second light receiving module are acquired, and then the gas concentration N1, the temperature T1, the signal DA2 and the signal DB2 are stored to the data storage module as third calibration data.

In one possible design, after the calibration method, the operation method of the optical gas detector further includes a gas concentration detection method, where the gas concentration detection method includes:

receiving temperature data Tx, a signal DAx transmitted by the first light receiving module and a signal DBx transmitted by the second light receiving module in real time, and then obtaining the current gas concentration according to the temperature data Tx, the signal DAx, the signal DBx, the first calibration data, the second calibration data and the third calibration data; wherein, the current gas concentration is:

Nx＝N1/(D1-D0)*(Dx-D0)+N1/(D2-D0)*(Tx-T0)；

wherein, D0= DA0-DB0, D1= DA1-DB1, and D2= DA1-DB2.

In one possible design, after obtaining the current gas concentration, the operating method of the optical gas detector further includes a concentration pre-warning method, where the concentration pre-warning method includes:

and judging whether the current gas concentration is within a preset concentration range, if not, sending an alarm signal to a preset server through the wireless communication module.

Drawings

FIG. 1 is a control block diagram of an optical gas detector;

FIG. 2 is a schematic circuit diagram of a master control module in the optical gas detector;

FIG. 3 is a schematic circuit diagram of the first light source emitting module or the second light source emitting module in the optical gas detector;

FIG. 4 is a schematic circuit diagram of a first light receiving module or a second light receiving module in the optical gas detector;

FIG. 5 is a schematic circuit diagram of a wireless communication module in the optical gas detector;

FIG. 6 is a schematic circuit diagram of a data storage module in the optical gas detector;

FIG. 7 is a schematic circuit diagram of an RS485 communication module in the optical gas detector;

fig. 8 is a schematic circuit diagram of a HART communication module in an optical gas detector;

FIG. 9 is a schematic circuit diagram of a heating module in the optical gas detector;

FIG. 10 is a schematic circuit diagram of a temperature and humidity detecting module in an optical gas detector;

FIG. 11 is a schematic circuit diagram of a power module in the optical gas detector;

FIG. 12 is a schematic view of the external structure of the optical gas sensor;

FIG. 13 isbase:Sub>A schematic view of the structure of FIG. 12 taken along line A-A;

FIG. 14 is a schematic view of the structure of FIG. 12 with the dust cap removed;

fig. 15 is a side view of fig. 14.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.

It should be understood that, for the term "and/or" as may appear herein, it is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time.

It will be understood that when an element is referred to herein as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.

Example 1:

the embodiment provides an optical gas detector, as shown in fig. 1 to 12, including a main control module, and a first detection module, a second detection module, a wireless communication module and a data storage module, which are respectively in communication connection with the main control module, wherein a first detection space corresponding to the first detection module is isolated from a second detection space corresponding to the second detection module, and the first detection space is used for accommodating a gas to be detected; the first detection module comprises a first light source emitting module 6 and a first light receiving module 7 which are respectively in communication connection with the main control module, light emitted by the first light source emitting module 6 penetrates into a first detection space and then is received by the first light receiving module 7, the second detection module comprises a second light source emitting module 8 and a second light receiving module 9 which are respectively in communication connection with the main control module, and light emitted by the second light source emitting module 8 penetrates into a second detection space and then is received by the second light receiving module 9.

The embodiment can realize the on-line monitoring of the gas concentration, and the monitoring precision is high. Specifically, in the using process of the present embodiment, the main control module may perform gas concentration detection based on a signal transmitted by the first light receiving module 7 in the first detection module, and after the gas concentration to be detected is obtained, the gas concentration data to be detected may be wirelessly transmitted to a preset server through the wireless communication module, so that a user can realize online monitoring of the gas concentration, which is beneficial to reducing the maintenance cost; in addition, in the implementation process of this embodiment, the second detection module can be used as a detection reference, and light such as infrared light and ultraviolet light emitted by the second light source emission module 8 does not interact with the gas to be measured and directly irradiates the second light receiving module 9 to form an independent light path, so as to filter the influence of environmental factors such as temperature, humidity and dust on the measurement accuracy; the first detection module is used for measuring gas to be detected, light emitted by the first light source emitting module 6 can be projected into the first detection space to act with the gas to be detected in the first detection space, an independent light path is formed until the light is received by the first light receiving module 7, and due to the arrangement of the second detection module, the detection precision of gas concentration can be improved.

In the prior art, a user is usually required to calibrate a reference value regularly, otherwise, a detection value is easy to have large deviation, and the measurement precision is low, so that false alarm is caused. To solve the technical problem, the present embodiment further improves the following: the optical gas detector further comprises an OTA upgrading module, and the OTA upgrading module is in communication connection with the main control module.

The embodiment can also carry out online debugging and calibration, and The embodiment can be remotely upgraded based on The OTA (Over The Air, which means a remote wireless upgrading technology), and has The advantages of remote calibration, remote positioning, accurate positioning and short response time. Specifically, in this embodiment, the OTA upgrading module may be matched with the wireless communication module, so as to implement remote upgrading of the firmware of the optical gas detector, and ensure that the optical gas detector meets the functional requirements of different application scenarios and different periods. Specifically, in this embodiment, the OTA upgrading module includes a network configuration unit and an updating unit, where the network configuration unit is configured to configure the wireless communication module to be connected to the preset network, and the updating unit is configured to complete software upgrading. When software upgrading is carried out remotely, the main control module in the optical gas detector automatically downloads an OTA upgrading packet from a preset server through the wireless communication module and installs the OTA upgrading packet, OTA upgrading is completed, and manual operation of a user is not needed.

In this embodiment, the server may be remotely connected to a plurality of gas detectors, and the server may comprehensively determine the parameter change condition of the components in the gas detectors according to the data of the concentration, the temperature, the humidity, and the like reported by each optical gas detector and the concentration data of other nearby gas detectors, and perform zero calibration on the gas detectors in a manner of issuing an instruction, thereby ensuring the detection accuracy of the gas detectors in the use process.

In this embodiment, the optical gas detector further includes a local communication module, the local communication module includes an RS485 communication module and a HART communication module, the RS485 communication module and the HART communication module are both in communication connection with the main control module.

In this embodiment, the RS485 communication module employs an MAX485 type RS485 chip and its peripheral circuit, and the HART communication module employs an a5191HRTPG type modem and its peripheral circuit.

In this embodiment, the optical gas detector further includes a heating module and a temperature and humidity detection module, the heating module is used for heating the first detection space and the second detection space, the temperature and humidity detection module is in communication connection with the main control module, and the temperature and humidity detection module is used for measuring temperature and humidity data in the first detection space and the second detection space and sending the temperature and humidity data to the main control module.

In this embodiment, the first light source emitting module 6 and the second light source emitting module 8 both include a light emitter L1, a light source driving module IC3, a polarity capacitor C13, a first resistor R15, an N-type MOS transistor Q1 and a second resistor R16, the model of the light source driving module IC3 is TMI8118, pins 1 and 6 of the light source driving module IC3 are respectively connected with both ends of the light emitter L1, pin 2 of the light source driving module IC3 is grounded through the first resistor R15, pin 2 of the light source driving module IC3 is also respectively connected with the drain electrodes of the main control module and the N-type MOS transistor Q1, the source electrode of the N-type MOS transistor Q1 is grounded, the gate electrode of the N-type MOS transistor Q1 is electrically connected with the main control module, the gate electrode of the N-type MOS transistor Q1 is also grounded through the second resistor R16, pin 5 of the light source driving module IC3 is respectively connected with the positive electrode of the polarity capacitor C13 and the power output end, the negative electrode of the polarity capacitor C13 is grounded, and the light source driving module IC3 and the main control module are electrically connected with the main control pin 4.

In this embodiment, each of the first light receiving module 7 and the second light receiving module 9 includes a light receiver TR1, a first signal amplification module and a second signal amplification module, which are connected in sequence, and an output end of the second signal amplification module is electrically connected to the main control module. In this embodiment, the first signal amplification module and the second signal amplification module both use operational amplifiers to amplify the input signal of the optical receiver TR 1.

As shown in fig. 12 to 15, in this embodiment, the optical gas detector further includes a base 1 and a dust cover 2 disposed on the top of the base 1, the dust cover 2 is provided with an air inlet hole 3 and an air outlet hole 4 in communication, a baffle 5 is disposed between the base 1 and the dust cover 2, the baffle 5 separates the base 1 from the dust cover 2, a space located above the baffle 5 and inside the dust cover 2 constitutes the first detection space, and a space located below the baffle 5 and inside the base 1 constitutes the second detection space.

In this embodiment, baffle 5 passes through the support column to be connected with base 1, realizes baffle 5's fixed from this, is convenient for increase the size in second detection space simultaneously.

In this embodiment, baffle 5 adopts the light-passing board, first survey the module with the module is surveyed to the second all sets up in base 1, just first light source emission module 6 and first light receiving module 7 in the first detection module all set up towards baffle 5, dust cover 2 is kept away from the one end of baffle 5 is provided with speculum 10, so that the light that first light source emission module 6 sent wears to penetrate to quilt behind the first detection space speculum 10 reflects extremely first light receiving module 7, second light source emission module 8 with second light receiving module 9 sets up relatively.

In this embodiment, speculum 10 adopts concave reflector 10, through the setting of speculum 10, can make the light that first light source emission module 6 launches is received by first light receiving module 7 after the reflection of concave surface reflector, can be convenient for install first light source emission module 6 and first light receiving module 7 in base 1 simultaneously from this, avoid the gaseous first light source emission module 6 and the first light receiving module 7 of the gaseous pollution that awaits measuring from this, do benefit to the whole life-span that improves this embodiment, and simultaneously, speculum 10's setting, the increase light path stroke of still being convenient for, be favorable to improving resolution ratio.

In this embodiment, baffle 5 and speculum 10 are equallyd divide and are connected with dust cover 2 through the support respectively, and all are provided with the sealing washer between baffle 5 and the support and between speculum 10 and the support to realize the isolation between first detection space and the second detection space.

It should be further understood that, in this embodiment, the modules such as the main control module, the wireless communication module, the data storage module, and the local communication module, and the power supply module for supplying power to all the modules are all installed in the PCB 11 disposed in the base 1, and the local communication module, the power supply input interface, and the like are all disposed at the wire harness through hole preset on the base 1, which is not described herein again.

Example 2:

the present embodiment provides a working method of an optical gas detector based on any one of embodiments 1, including a calibration method, where the calibration method includes:

under the condition of no gas to be detected, when the temperature is T0, acquiring a signal DA0 transmitted by the first light receiving module 7 and a signal DB0 transmitted by the second light receiving module 9, and then storing the gas concentration 0, the temperature T0, the signal DA0 and the signal DB0 as first calibration data in the data storage module;

under the condition that the concentration of the detected gas is N1, when the temperature is T0, acquiring a signal DA1 transmitted by the first light receiving module 7 and a signal DB1 transmitted by the second light receiving module 9, and then storing the gas concentration N1, the temperature T0, the signal DA1 and the signal DB1 as second calibration data into the data storage module;

under the condition that the concentration of the gas to be detected is N1, when the temperature is T1, the signal DA2 transmitted by the first light receiving module 7 and the signal DB2 transmitted by the second light receiving module 9 are acquired, and then the gas concentration N1, the temperature T1, the signal DA2 and the signal DB2 are stored to the data storage module as third calibration data.

In this embodiment, after the calibration method, the working method of the optical gas detector further includes a gas concentration detection method, where the gas concentration detection method includes:

receiving temperature data Tx, a signal DAx transmitted by the first light receiving module 7 and a signal DBx transmitted by the second light receiving module 9 in real time, and then obtaining the current gas concentration according to the temperature data Tx, the signal DAx, the signal DBx, the first calibration data, the second calibration data and the third calibration data; wherein, the current gas concentration is:

Nx＝N1/(D1-D0)*(Dx-D0)+N1/(D2-D0)*(Tx-T0)；

wherein, D0= DA0-DB0, D1= DA1-DB1, and D2= DA1-DB2.

In this embodiment, after the current gas concentration is obtained, the working method of the optical gas detector further includes a concentration early warning method, where the concentration early warning method includes:

and judging whether the current gas concentration is within a preset concentration range, if not, sending an alarm signal to a preset server through the wireless communication module.

It should be further noted that when the RS485 communication module in the local communication module is used, the upper computer can acquire information such as current gas concentration, detector temperature, fault code and the like from the RS485 communication module in a data stream manner according to an RS485 protocol, the upper computer sets a threshold value, and when the current gas concentration exceeds the threshold value, an alarm is given; when the HART communication module is used, the upper computer can acquire information such as current gas concentration, current detector temperature, fault codes and the like in a data flow mode according to a HART communication protocol, a gas concentration value is defined in a range of 4-20mA of current, and an alarm is given when the current gas concentration exceeds a threshold value.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. And such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Finally, it should be noted that the present invention is not limited to the above alternative embodiments, and that various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.

Claims (10)

1. An optical gas detector, characterized by: the gas detection device comprises a main control module, and a first detection module, a second detection module, a wireless communication module and a data storage module which are respectively in communication connection with the main control module, wherein a first detection space corresponding to the first detection module is isolated from a second detection space corresponding to the second detection module, and the first detection space is used for containing gas to be detected; the first detection module comprises a first light source emitting module (6) and a first light receiving module (7) which are in communication connection with the main control module respectively, light emitted by the first light source emitting module (6) penetrates into a first detection space and then is received by the first light receiving module (7), the second detection module comprises a second light source emitting module (8) and a second light receiving module (9) which are in communication connection with the main control module respectively, and light emitted by the second light source emitting module (8) penetrates into a second detection space and then is received by the second light receiving module (9).

2. An optical gas sensor according to claim 1, wherein: the optical gas detector further comprises an OTA upgrading module, and the OTA upgrading module is in communication connection with the main control module.

3. An optical gas detector as claimed in claim 1, characterized in that: the optical gas detector further comprises a heating module and a temperature and humidity detection module, the heating module is used for heating the first detection space and the second detection space, the temperature and humidity detection module is in communication connection with the main control module, and the temperature and humidity detection module is used for measuring temperature and humidity data in the first detection space and the second detection space and sending the temperature and humidity data to the main control module.

4. An optical gas sensor according to claim 1, wherein: first light source emission module (6) with second light source emission module (8) all include light emitter (L1), light source drive module (IC 3), polarity electric capacity (C13), first resistance (R15), N type MOS pipe (Q1) and second resistance (R16), light source drive module (IC 3) model be TMI8118, 1 foot and 6 foot of light source drive module (IC 3) respectively with the both ends of light emitter (L1) are connected, 2 feet of light source drive module (IC 3) are through first resistance (R15) ground connection, 2 feet of light source drive module (IC 3) still respectively with the drain electrode electricity of master control module and N type MOS pipe (Q1) is connected, the source ground connection of N type MOS pipe (Q1), the grid of N type MOS pipe (Q1) with the master control module electricity is connected, the grid of N type MOS pipe (Q1) still passes through second resistance (R16) ground connection, light source drive module (IC 3) with the polarity electric capacity (C3) and the negative pole electricity of power respectively connect with the polarity electric capacity (C13) ground connection, the polarity electric capacity drive module (IC 3) and the polarity electric capacity output.

5. An optical gas sensor according to claim 1, wherein: the first light receiving module (7) and the second light receiving module (9) comprise a light receiver (TR 1), a first signal amplification module and a second signal amplification module which are sequentially connected, and the output end of the second signal amplification module is electrically connected with the main control module.

6. An optical gas detector as claimed in claim 1, characterized in that: optical type gas detector still includes base (1) and sets up dust cover (2) at base (1) top, dust cover (2) intercommunication is provided with inlet port (3) and venthole (4), be provided with baffle (5) between base (1) and dust cover (2), baffle (5) will base (1) with dust cover (2) keep apart the setting, wherein, be located baffle (5) upper portion just is located space in dust cover (2) constitutes first detection space, is located baffle (5) lower part just is located space in base (1) constitutes the second detects the space.

7. An optical gas sensor according to claim 6, wherein: baffle (5) adopt the light-passing board, first survey the module with the module is surveyed to the second all sets up in base (1), just first light source emission module (6) and first light receiving module (7) in the first detection module all set up towards baffle (5), dust cover (2) are kept away from the one end of baffle (5) is provided with speculum (10), so that the light that first light source emission module (6) sent wears to by behind the first detection space speculum (10) reflect extremely first light receiving module (7), second light source emission module (8) with second light receiving module (9) set up relatively.

8. An operating method of an optical gas detector based on any one of claims 1 to 7, characterized in that: the method comprises a calibration method, wherein the calibration method comprises the following steps:

under the condition of no gas to be detected, when the temperature is T0, acquiring a signal DA0 transmitted by the first light receiving module (7) and a signal DB0 transmitted by the second light receiving module (9), and then storing the gas concentration 0, the temperature T0, the signal DA0 and the signal DB0 as first calibration data into the data storage module;

under the condition that the concentration of the detected gas is N1, when the temperature is T0, acquiring a signal DA1 transmitted by the first light receiving module (7) and a signal DB1 transmitted by the second light receiving module (9), and then storing the gas concentration N1, the temperature T0, the signal DA1 and the signal DB1 as second calibration data into the data storage module;

under the condition that the concentration of the detected gas is N1, when the temperature is T1, the signal DA2 transmitted by the first light receiving module (7) and the signal DB2 transmitted by the second light receiving module (9) are acquired, and then the gas concentration N1, the temperature T1, the signal DA2 and the signal DB2 are stored into the data storage module as third calibration data.

9. A method of operating an optical gas sensor as claimed in claim 8, wherein: after the calibration method, the working method of the optical gas detector further comprises a gas concentration detection method, and the gas concentration detection method comprises the following steps:

receiving temperature data Tx, a signal DAx transmitted by the first light receiving module (7) and a signal DBx transmitted by the second light receiving module (9) in real time, and then obtaining the current gas concentration according to the temperature data Tx, the signal DAx, the signal DBx, the first calibration data, the second calibration data and the third calibration data; wherein, the current gas concentration is:

Nx＝N1/(D1-D0)*(Dx-D0)+N1/(D2-D0)*(Tx-T0)；

wherein, D0= DA0-DB0, D1= DA1-DB1, and D2= DA1-DB2.

10. A method of operating an optical gas sensor as claimed in claim 9, wherein: after the current gas concentration is obtained, the working method of the optical gas detector further comprises a concentration early warning method, and the concentration early warning method comprises the following steps:

and judging whether the current gas concentration is within a preset concentration range, if not, sending an alarm signal to a preset server through the wireless communication module.

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