CN113237843B - Non-dispersive infrared gas analysis circuit and analysis method based on embedded system - Google Patents
Non-dispersive infrared gas analysis circuit and analysis method based on embedded system Download PDFInfo
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- 238000004868 gas analysis Methods 0.000 title claims abstract description 37
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Abstract
The invention relates to an embedded system-based non-dispersive infrared gas analysis circuit and an analysis method, wherein the analysis circuit comprises a detection component, a signal processing circuit, a main control circuit, a light source frequency modulation circuit, a light source, an environment monitoring circuit, a man-machine interaction circuit and a power supply circuit, the detection component is electrically connected with the signal processing circuit, the signal processing circuit and the environment monitoring circuit are respectively electrically connected with the main control circuit, the main control circuit is electrically connected with the light source frequency modulation circuit, the man-machine interaction circuit is electrically connected with the main control circuit, and the output end of the light source frequency modulation circuit is electrically connected with the light source. The main control circuit in the invention combines the environmental information monitored by the environmental monitoring component to carry out compensation processing and display on the concentration value, the man-machine interaction circuit can adjust the frequency of the light source so as to adjust the intensity of infrared light after being partially absorbed, thus obtaining the gas concentration analysis result, being suitable for different kinds of gas analysis, having simple operation and accurate detection result, being convenient for development and work and saving time cost.
Description
Technical Field
The invention relates to the technical field of gas concentration analysis, in particular to a non-dispersive infrared gas analysis circuit and an analysis method based on an embedded system.
Background
The principle applied to measuring gas concentration using a non-dispersive infrared gas analyzer is beer's law, which has the following formula:
wherein each letter has the following meaning: i is the infrared light intensity after being absorbed by the gas to be detected in the sample gas, I 0 Is the intensity of infrared light not absorbed by the reference gas; k is the absorption coefficient of the gas to be detected in the sample gas DZ to infrared light, C is the concentration of the gas to be detected in the sample gas, and L is the length of the gas chamber.
For a non-dispersive infrared gas analysis device, the measured gas in the sample gas is determined, namely the infrared absorption coefficient k of the measured gas to the radiation wave band is fixed, and the length L of the gas chamber is fixed. From beer's law, it can be seen that: by measuring the intensity I of infrared light not absorbed by the gas to be measured 0 The intensity I of the absorbed infrared light determines the concentration C of the gas to be treated.
The prior art does not have matched development equipment which can be used for gas analysis, the existing non-dispersive infrared gas analyzer cannot be used generally, and specific infrared light is aimed at, so that the infrared light absorption coefficient is also solitary, the gas concentration analysis of different absorption degrees cannot be aimed at, the gas analysis of different types and different kinds cannot be adapted, and difficulty and time cost are brought to development work.
Disclosure of Invention
The invention aims to solve the technical problem of providing a non-dispersive infrared gas analysis circuit and an analysis method based on an embedded system aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the non-dispersive infrared gas analysis circuit based on the embedded system comprises a detection assembly, a signal processing circuit, a main control circuit, a light source frequency modulation circuit, a light source, an environment monitoring circuit, a man-machine interaction circuit and a power supply circuit, wherein the output end of the detection assembly is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit and the output end of the environment monitoring circuit are respectively electrically connected with the signal input end of the main control circuit, the signal output end of the main control circuit is electrically connected with the input end of the light source frequency modulation circuit, the man-machine interaction circuit is electrically connected with the main control circuit, the output end of the light source frequency modulation circuit is electrically connected with the light source, and the power supply circuit is respectively electrically connected with the signal processing circuit, the main control circuit, the light source frequency modulation circuit, the light source, the man-machine interaction circuit and the environment monitoring circuit;
The detection component is used for detecting the target gas in real time to obtain infrared light intensity information absorbed by the target gas part and sending the infrared light intensity information to the signal processing circuit;
the signal processing circuit is used for performing signal processing on the infrared light intensity information and sending the infrared light intensity information to the main control circuit;
the environment monitoring circuit is used for monitoring environment information in real time and sending the environment information to the main control circuit;
the main control circuit is used for calculating the concentration value of the target gas according to the infrared light intensity information after signal processing and directly reading the environmental parameter value according to the environmental information; the concentration value of the target gas is compensated according to the environment parameter value, and the compensated concentration value and the environment parameter value are respectively displayed on a display screen;
the man-machine interaction circuit receives a light source frequency setting command;
the main control circuit is also used for generating a driving signal according to the light source frequency setting command, controlling the light source frequency modulation circuit to drive the light source to adjust the frequency, and repeatedly circulating in this way to obtain an analysis result of the target gas concentration.
The beneficial effects of the invention are as follows: according to the non-dispersive infrared gas analysis circuit based on the embedded system, the infrared light intensity information which is partially absorbed by the target gas is detected through the detection component and is processed by the signal processing circuit, the concentration value of the target gas is calculated by the main control circuit, the main control circuit is combined with the environmental information monitored by the environmental monitoring circuit to carry out compensation processing on the concentration value and display the concentration value, meanwhile, the man-machine interaction circuit can adjust the frequency of the light source to adjust the infrared light intensity which is partially absorbed, so that a gas concentration analysis result is obtained, the non-dispersive infrared gas analysis circuit based on the embedded system can be suitable for different kinds of gas analysis, is simple to operate, has accurate detection results, is greatly convenient for development work, and saves time cost.
Based on the technical scheme, the invention can also be improved as follows:
further: the detection assembly comprises an air chamber and a detector, wherein an optical channel is arranged between two ends of the air chamber in a penetrating way, the detector and the light source are respectively arranged at two ends of the air chamber in a sealing way, and the optical fiber irradiation emitted by the light source is incident to a receiving area of the detector through the optical channel.
The beneficial effects of the above-mentioned further scheme are: the detector and the light source are respectively arranged at the two ends of the air chamber in a sealing way, so that the infrared light emitted by the light source can be partially absorbed into a receiving area which is incident to detection so as to be received by the detector, and the intensity information of the partially absorbed infrared light can be accurately detected so as to accurately calculate the concentration of the target group gas in the follow-up process.
Further: the signal processing circuit comprises a front-end signal conditioning circuit and a rear-end signal conditioning circuit, the front-end signal conditioning circuit comprises a front-end measuring signal conditioning circuit and a front-end reference signal conditioning circuit, and the rear-end signal conditioning circuit comprises a rear-end measuring signal conditioning circuit and a rear-end reference signal conditioning circuit;
the measuring signal output end of the detector is electrically connected with the input end of the front-end measuring signal conditioning circuit, the output end of the front-end measuring signal conditioning circuit is electrically connected with the input end of the rear-end measuring signal conditioning circuit, and the output end of the rear-end measuring signal conditioning circuit is electrically connected with the measuring signal input end of the main control circuit;
The reference signal output end of the detector is electrically connected with the input end of the front-end reference signal conditioning circuit, the output end of the front-end reference signal conditioning circuit is electrically connected with the input end of the rear-end reference signal conditioning circuit, and the output end of the rear-end reference signal conditioning circuit is electrically connected with the reference signal input end of the main control circuit.
The beneficial effects of the above-mentioned further scheme are: the front-end measuring signal conditioning circuit and the front-end reference signal conditioning circuit can amplify sine signals in the measuring signal and the conditioning signal respectively without reducing direct current signals in the measuring signal and the conditioning signal, inhibit the high-frequency noise of the signals, improve the signal-to-noise ratio, enable the signals to have stronger anti-interference capability when in long-distance transmission, transmit effective output signals to the rear-end signal conditioning circuit for processing, and the rear-end signal conditioning circuit performs the functions of high-frequency filtering and further amplifying the signals, meanwhile overturns sine signals, namely, overturns the negative half axle of sine waves, so that the negative voltage signals become positive voltage signals, and meet the sampling conditions of the signal processing circuit.
Further: the front-end measurement signal conditioning circuit comprises an operational amplifier U17, a resistor R59, a resistor R60, a capacitor C64, a resistor R61 and a capacitor C68, wherein the non-inverting input end of the operational amplifier U17 is electrically connected with the detection signal output end of the detector, the non-inverting input end of the operational amplifier U17 is grounded through the resistor R59, the resistor R60 and the capacitor C64 are sequentially connected in series between the inverting input end of the operational amplifier U17 and the ground, the resistor R61 and the capacitor C68 are connected in parallel between the inverting input end and the output end of the operational amplifier U17, and the output end of the operational amplifier U17 is electrically connected with the input end of the rear-end measurement signal conditioning circuit;
The front-end reference signal conditioning circuit comprises an operational amplifier U19, a resistor R63, a capacitor C70, a resistor R64, a resistor R65 and a capacitor C71, wherein the non-inverting input end of the operational amplifier U19 is electrically connected with the reference signal output end of the detector, the non-inverting input end of the operational amplifier U19 is grounded through the resistor R63, the resistor R64 and the capacitor C70 are sequentially connected in series between the inverting input end of the operational amplifier U19 and the ground, the resistor R65 and the capacitor C71 are connected in parallel between the inverting input end and the output end of the operational amplifier U19, and the output end of the operational amplifier U19 is electrically connected with the input end of the rear-end reference signal conditioning circuit.
The beneficial effects of the above-mentioned further scheme are: the operational amplifier U17 and the operational amplifier U19 form a signal processing circuit of two paths, a negative feedback network is formed by the capacitor C64, the resistor R60, the resistor R61 and the capacitor C68 together, so that the amplification of a measurement signal is realized, meanwhile, the R61 and the capacitor C68 are connected in parallel to inhibit the amplification of a high-frequency signal, the capacitor C64 and the resistor R60 are connected in series to inhibit the amplification of a direct current component in an original signal, and therefore, the amplified signal is ensured to be only a useful alternating current signal output by a sensor.
Further: the back-end measurement signal conditioning circuit comprises a variable resistor R69, a resistor R71, a capacitor C72, a resistor R66, an operational amplifier U20A, a resistor R73, a capacitor C74, a resistor R67, an operational amplifier U21C, a capacitor C73, a Schottky diode D10, a resistor R68, a resistor R70, an operational amplifier U21D and a resistor R72, the output end of the front end measurement signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20A through the capacitor C72, the non-inverting input end of the operational amplifier U20A is grounded through the resistor R66, the resistor R71 and the variable resistor R69 are serially connected between the inverting input end of the operational amplifier U20A and the ground in sequence, the resistor R73 and the capacitor C74 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U20A, the output end of the operational amplifier U20A is grounded through the resistor R67, the output end of the operational amplifier U20A is electrically connected with the non-inverting input end of the operational amplifier U21C, the capacitor C73 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U21C, the inverting input end and the output end of the operational amplifier U21C are respectively and correspondingly and electrically connected with the No. 1 pin and the No. 3 pin of the Schottky diode D10, the pin 2 of the schottky diode D10 is grounded through the resistor R68, the pin 2 of the schottky diode D10 is electrically connected with the non-inverting input terminal of the operational amplifier U21D, the inverting input terminal of the operational amplifier U21D is electrically connected to the non-inverting input terminal of the operational amplifier U21C through the resistor R70, the resistor R72 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U21D, the output end of the operational amplifier U21D is electrically connected with the measurement signal input end of the main control circuit;
The back-end reference signal conditioning circuit comprises a capacitor C75, a resistor R74, a variable resistor R77, a resistor R79, an operational amplifier U20B, a resistor R81, a capacitor C77, a resistor R75, an operational amplifier U21B, a capacitor C76, a Schottky diode D11, a resistor R76, a resistor R78, an operational amplifier U22C and a resistor R80, the output end of the front-end reference signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20B through the capacitor C75, the non-inverting input end of the operational amplifier U20B is grounded through the resistor R74, the resistor R79 and the variable resistor R77 are electrically connected between the inverting input end of the operational amplifier U20B and the ground in sequence, the resistor R81 and the capacitor C77 are connected in parallel between the inverting input end and the output end of the operational amplifier U20B, the output end of the operational amplifier U20B is grounded through the resistor R75, the output end of the operational amplifier U20B is electrically connected with the non-inverting input end of the operational amplifier U21B, the capacitor C76 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U21B, the inverting input end and the output end of the operational amplifier U21B are respectively and correspondingly and electrically connected with the No. 1 pin and the No. 3 pin of the Schottky diode D11, the pin 2 of the schottky diode D11 is grounded through the resistor R76, the pin 2 of the schottky diode D11 is electrically connected with the non-inverting input terminal of the operational amplifier U22C, the inverting input terminal of the operational amplifier U22C is electrically connected to the non-inverting input terminal of the operational amplifier U21B through the resistor R78, the resistor R80 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U22C, the output end of the operational amplifier U22C is electrically connected with the reference signal input end of the main control circuit.
The beneficial effects of the above-mentioned further scheme are: the capacitor C72, the resistor R66 and the operational amplifier U20A jointly form an active high-pass filter, signals with the frequency lower than the signal cut-off frequency are restrained and cannot be transmitted to a next-stage circuit, so that direct-current signals and low-frequency noise signals are filtered, the resistor R69, the resistor R71, the resistor R73 and the capacitor C74 jointly form a negative feedback circuit, signals are amplified in the same direction, the R60 is an adjustable resistor, the amplification factor can be adjusted, the finally output signals are kept to the same level, and convenience is brought to rear-end processing.
Further: the light source frequency modulation circuit comprises a boosting chip U2, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a capacitor C5, a capacitor C6, a resistor R1 and a MOS tube Q1, wherein the power input end of the boosting chip U2 is electrically connected with the +5V output end of the power circuit, the power input end of the boosting chip U2 is grounded through the capacitor C6, two inductance connection ends of the boosting chip U2 are respectively electrically connected with two ends of the inductor L1, the grounding end of the boosting chip U2 is grounded, the output end of the boosting chip U2 is electrically connected with the power input end of a light source, the output end of the boosting chip U2 is grounded through the capacitor C2, the feedback input end of the boosting chip U2 is electrically connected with the feedback input end of the power circuit through the resistor R3, the enabling end of the boosting chip U2 is grounded through the capacitor C5, the grid electrode of the MOS tube Q1 is electrically connected with the output end of the light source, and the MOS tube Q is electrically connected with the drain electrode of the light source.
The beneficial effects of the above-mentioned further scheme are: the boost chip U2 provides a stable and reliable power supply for the light source, the MOS tube Q1 and the resistor R1 form a switching circuit, and PWM waves output by the main control circuit control the switching frequency of the MOS tube Q1, so that the frequency of the light source is controlled.
Further: the environment monitoring circuit comprises an air pressure monitoring circuit and a temperature monitoring circuit, and the output ends of the air pressure monitoring circuit and the temperature monitoring circuit are respectively and electrically connected with the environment signal input end of the main control circuit.
The beneficial effects of the above-mentioned further scheme are: the air pressure monitoring circuit and the temperature monitoring circuit can respectively monitor air pressure information and temperature information in the environment, and the measured gas concentration measured value is corrected by utilizing the environment data, so that higher-precision concentration measured data are obtained, and the use requirements under different scenes are met.
Further: the man-machine interaction circuit comprises keys and a display screen, and the keys and the display screen are respectively and electrically connected with the interaction port of the main control circuit.
The beneficial effects of the above-mentioned further scheme are: the key can be used for inputting a light source frequency setting command, so that the main control circuit can conveniently generate a driving signal according to the light source frequency setting command so as to drive the light source to adjust the frequency, so that the intensity of the infrared light after being partially absorbed is adjusted, and the concentration of different types of gases is measured.
Further: the non-dispersive infrared gas analysis circuit based on the embedded system further comprises a communication circuit, the main control circuit is electrically connected with the communication circuit, and the communication circuit is electrically connected with an external receiving terminal.
The beneficial effects of the above-mentioned further scheme are: the communication circuit can be directly connected with an external receiving terminal in a communication way, so that data interaction between the communication circuit and the receiving terminal is facilitated, and test data are sent to the receiving terminal so as to perform data analysis and processing in the next step.
The invention also provides an analysis method based on the embedded system non-dispersive infrared gas analysis circuit, which comprises the following steps:
the analysis circuit is initialized, the detection component detects the target gas in real time to obtain the concentration information of the target gas, and the concentration information is sent to the signal processing circuit;
the signal processing circuit performs signal processing on the concentration information and sends the concentration information to the main control circuit;
the environment monitoring circuit monitors environment information in real time and sends the environment information to the main control circuit;
the main control circuit reads the concentration value of the target gas according to the concentration information after signal processing and directly reads the environmental parameter value according to the environmental information;
The main control circuit performs compensation processing on the concentration value of the target gas according to the environment parameter value, and displays the compensated concentration value and the environment parameter value on a display screen respectively;
the man-machine interaction circuit receives a light source frequency setting command, the main control circuit generates a driving signal according to the light source frequency setting command and sends the driving signal to the light source frequency modulation circuit, the light source frequency modulation circuit adjusts the light source frequency according to the driving signal, and the steps are repeated to obtain an analysis result of the target gas concentration.
According to the analysis method based on the embedded system non-dispersive infrared gas analysis circuit, the infrared light intensity information which is partially absorbed by the target gas is detected through the detection component and is processed by the signal processing circuit, the concentration value of the target gas is calculated by the main control circuit, the main control circuit is combined with the environmental information monitored by the environmental monitoring circuit to carry out compensation processing and display on the concentration value, meanwhile, the man-machine interaction circuit can adjust the frequency of the light source to adjust the infrared light intensity which is partially absorbed, so that the gas concentration analysis result is obtained, the method is applicable to different kinds of gas analysis, the operation is simple, the detection result is accurate, development work is greatly facilitated, and the time cost is saved.
Drawings
FIG. 1 is a schematic diagram of an embedded system non-dispersive infrared gas analysis circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a front-end signal conditioning circuit according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a back-end signal conditioning circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a light source frequency modulation circuit according to an embodiment of the invention.
Description of the embodiments
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in FIG. 1, the non-dispersive infrared gas analysis circuit based on the embedded system comprises a detection component, a signal processing circuit, a main control circuit, a light source frequency modulation circuit, a light source, an environment monitoring circuit, a man-machine interaction circuit and a power supply circuit, wherein the output end of the detection component is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit and the output end of the environment monitoring circuit are respectively electrically connected with the signal input end of the main control circuit, the signal output end of the main control circuit is electrically connected with the input end of the light source frequency modulation circuit, the man-machine interaction circuit is electrically connected with the main control circuit, the output end of the light source frequency modulation circuit is electrically connected with the light source, and the power supply circuit is respectively electrically connected with the signal processing circuit, the main control circuit, the light source frequency modulation circuit, the light source, the man-machine interaction circuit and the environment monitoring circuit.
The detection component is used for detecting the target gas in real time to obtain infrared light intensity information absorbed by the target gas part and sending the infrared light intensity information to the signal processing circuit;
the signal processing circuit is used for performing signal processing on the infrared light intensity information and sending the infrared light intensity information to the main control circuit;
the environment monitoring circuit is used for monitoring environment information in real time and sending the environment information to the main control circuit;
the main control circuit is used for calculating the concentration value of the target gas according to the infrared light intensity information after signal processing and directly reading the environmental parameter value according to the environmental information; the concentration value of the target gas is compensated according to the environment parameter value, and the compensated concentration value and the environment parameter value are respectively displayed on a display screen;
the man-machine interaction circuit receives a light source frequency setting command;
the main control circuit is also used for generating a driving signal according to the light source frequency setting command, controlling the light source frequency modulation circuit to drive the light source to adjust the frequency, and repeatedly circulating in this way to obtain an analysis result of the target gas concentration.
According to the non-dispersive infrared gas analysis circuit based on the embedded system, the infrared light intensity information which is partially absorbed by the target gas is detected through the detection component and is processed by the signal processing circuit, the concentration value of the target gas is calculated by the main control circuit, the main control circuit is combined with the environmental information monitored by the environmental monitoring circuit to carry out compensation processing on the concentration value and display the concentration value, meanwhile, the man-machine interaction circuit can adjust the frequency of the light source to adjust the infrared light intensity which is partially absorbed, so that a gas concentration analysis result is obtained, the non-dispersive infrared gas analysis circuit based on the embedded system can be suitable for different kinds of gas analysis, is simple to operate, has accurate detection results, is greatly convenient for development work, and saves time cost.
In one or more embodiments of the present invention, the detection assembly includes a gas chamber and a detector, wherein a light channel is disposed therethrough between two ends of the gas chamber, the detector and a light source are respectively disposed at two ends of the gas chamber in a sealing manner, and an optical fiber emitted from the light source irradiates a receiving area of the detector via the light channel. The detector and the light source are respectively arranged at the two ends of the air chamber in a sealing way, so that the infrared light emitted by the light source can be partially absorbed into a receiving area which is incident to detection so as to be received by the detector, and the intensity information of the partially absorbed infrared light can be accurately detected so as to accurately calculate the concentration of the target group gas in the follow-up process.
In order to conveniently find the optimal air chamber length, in practice, air chambers with different lengths can be replaced according to the needs, so that different test data can be obtained by changing the test environment in a short time, and the analysis of the measurement data results is facilitated.
In one or more embodiments of the invention, the signal processing circuit includes a front-end signal conditioning circuit including a front-end measurement signal conditioning circuit and a front-end reference signal conditioning circuit, and a back-end signal conditioning circuit including a back-end measurement signal conditioning circuit and a back-end reference signal conditioning circuit.
The measuring signal output end of the detector is electrically connected with the input end of the front-end measuring signal conditioning circuit, the output end of the front-end measuring signal conditioning circuit is electrically connected with the input end of the rear-end measuring signal conditioning circuit, and the output end of the rear-end measuring signal conditioning circuit is electrically connected with the measuring signal input end of the main control circuit;
the reference signal output end of the detector is electrically connected with the input end of the front-end reference signal conditioning circuit, the output end of the front-end reference signal conditioning circuit is electrically connected with the input end of the rear-end reference signal conditioning circuit, and the output end of the rear-end reference signal conditioning circuit is electrically connected with the reference signal input end of the main control circuit.
The front-end measuring signal conditioning circuit and the front-end reference signal conditioning circuit can amplify sine signals in the measuring signal and the conditioning signal respectively without reducing direct current signals in the measuring signal and the conditioning signal, inhibit the high-frequency noise of the signals, improve the signal-to-noise ratio, enable the signals to have stronger anti-interference capability when in long-distance transmission, transmit effective output signals to the rear-end signal conditioning circuit for processing, and the rear-end signal conditioning circuit performs the functions of high-frequency filtering and further amplifying the signals, meanwhile overturns sine signals, namely, overturns the negative half axle of sine waves, so that the negative voltage signals become positive voltage signals, and meet the sampling conditions of the signal processing circuit.
When the detector works, the output original signal is an alternating current sinusoidal signal, the signal frequency is the light source frequency, but the amplitude of the sinusoidal signal at the moment is extremely small and is about 2-3mV, and the signal at the moment is overlapped with a direct current voltage signal of about 500-600mV, so that a signal processing circuit is arranged at the front end (close to the detector), the circuit can amplify small signals without amplifying the direct current signal, inhibit high-frequency noise in the signal and improve the signal-to-noise ratio, so that the signal has stronger anti-interference capability when being transmitted in a long distance, and the effective output signal is transmitted to the rear end for processing.
In one or more embodiments of the present invention, as shown in fig. 2, the front-end measurement signal conditioning circuit includes an operational amplifier U17, a resistor R59, a resistor R60, a capacitor C64, a resistor R61, and a capacitor C68, where a non-inverting input terminal of the operational amplifier U17 is electrically connected to a detection signal output terminal of the detector, the non-inverting input terminal of the operational amplifier U17 is grounded through the resistor R59, the resistor R60 and the capacitor C64 are serially connected in sequence between an inverting input terminal and ground of the operational amplifier U17, the resistor R61 and the capacitor C68 are connected in parallel between an inverting input terminal and an output terminal of the operational amplifier U17, and an output terminal of the operational amplifier U17 is electrically connected to an input terminal of the back-end measurement signal conditioning circuit.
The operational amplifier U17 and the operational amplifier U19 form a signal processing circuit of two paths, a negative feedback network is formed by the capacitor C64, the resistor R60, the resistor R61 and the capacitor C68, the amplification of a measurement signal is realized, the amplification factor F=1+ (R61/R60) is realized, meanwhile, the R61 and the capacitor C68 are connected in parallel to inhibit the amplification of a high-frequency signal, the capacitor C64 and the resistor R60 are connected in series to inhibit the amplification of a direct current component in an original signal, and therefore, the amplified signal is ensured to be only a useful alternating current signal output by a sensor.
The front-end reference signal conditioning circuit comprises an operational amplifier U19, a resistor R63, a capacitor C70, a resistor R64, a resistor R65 and a capacitor C71, wherein the non-inverting input end of the operational amplifier U19 is electrically connected with the reference signal output end of the detector, the non-inverting input end of the operational amplifier U19 is grounded through the resistor R63, the resistor R64 and the capacitor C70 are sequentially connected in series between the inverting input end of the operational amplifier U19 and the ground, the resistor R65 and the capacitor C71 are connected in parallel between the inverting input end and the output end of the operational amplifier U19, and the output end of the operational amplifier U19 is electrically connected with the input end of the rear-end reference signal conditioning circuit. The working principle of the front-end measurement signal conditioning circuit is the same as that of the front-end measurement signal conditioning circuit, and the description is omitted here.
In one or more embodiments of the present invention, as shown in fig. 3, the back-end measurement signal conditioning circuit includes a variable resistor R69, a resistor R71, a capacitor C72, a resistor R66, an operational amplifier U20A, a resistor R73, a capacitor C74, a resistor R67, an operational amplifier U21C, a capacitor C73, a schottky diode D10, a resistor R68, a resistor R70, an operational amplifier U21D and a resistor R72, an output end of the front-end measurement signal conditioning circuit is electrically connected to a non-inverting input end of the operational amplifier U20A through the capacitor C72, a non-inverting input end of the operational amplifier U20A is grounded through the resistor R66, the resistor R71 and the variable resistor R69 are serially connected between an inverting input end of the operational amplifier U20A and the ground in sequence, the resistor R73 and the capacitor C74 are connected in parallel between the inverting input end and the output end of the operational amplifier U20A, the output end of the operational amplifier U20A is grounded through the resistor R67, the output end of the operational amplifier U20A is electrically connected with the non-inverting input end of the operational amplifier U21C, the capacitor C73 is electrically connected between the inverting input end and the output end of the operational amplifier U21C, the inverting input end and the output end of the operational amplifier U21C are respectively and correspondingly electrically connected with the pin 1 and the pin 3 of the Schottky diode D10, the pin 2 of the Schottky diode D10 is grounded through the resistor R68, the pin 2 of the Schottky diode D10 is electrically connected with the non-inverting input end of the operational amplifier U21D, the inverting input end of the operational amplifier U21D is electrically connected with the non-inverting input end of the operational amplifier U21C through the resistor R70, the resistor R72 is electrically connected between the inverting input end and the output end of the operational amplifier U21D, the output end of the operational amplifier U21D is electrically connected with the measurement signal input end of the main control circuit.
The capacitor C72, the resistor R66 and the operational amplifier U20A jointly form an active high-pass filter, signals with the frequency lower than the signal cut-off frequency are restrained and cannot be transmitted to a next-stage circuit, so that direct-current signals and low-frequency noise signals are filtered, the resistor R69, the resistor R71, the resistor R73 and the capacitor C74 jointly form a negative feedback circuit, the signals are amplified in the same direction, the amplification factor F=1+ (R73/(R69+R71)), the R60 is an adjustable resistor, the amplification factor can be adjusted, the finally output signals are kept to the same level, and convenience is provided for rear-end processing. U21C, C, D10, R68, R70 and U21D form a signal turnover circuit together, when the signal is a positive half-cycle signal, the operational amplifier U21C outputs, and finally the positive half-cycle signal is output through U21D; when the signal is in the negative half cycle, the output of the 8 pin of the operational amplifier U21C is 0, the Schottky diode D10 is cut off, and the negative half cycle signal enters the reverse input end of the operational amplifier U21D through the R70, and finally the output signal of the 14 pin of the operational amplifier U21D is turned over, and the negative half cycle signal is turned over to the positive half cycle signal.
In one or more embodiments of the present invention, the back-end reference signal conditioning circuit includes a capacitor C75, a resistor R74, a variable resistor R77, a resistor R79, an operational amplifier U20B, a resistor R81, a capacitor C77, a resistor R75, an operational amplifier U21B, a capacitor C76, a schottky diode D11, a resistor R76, a resistor R78, an operational amplifier U22C and a resistor R80, an output end of the front-end reference signal conditioning circuit is electrically connected to a non-inverting input end of the operational amplifier U20B through the capacitor C75, a non-inverting input end of the operational amplifier U20B is grounded through the resistor R74, the resistor R79 and the variable resistor R77 are electrically connected in sequence between an inverting input end of the operational amplifier U20B and the ground, the resistor R81 and the capacitor C77 are connected in parallel between the inverting input end and an output end of the operational amplifier U20B, the output end of the operational amplifier U20B is grounded through the resistor R75, the output end of the operational amplifier U20B is electrically connected with the non-inverting input end of the operational amplifier U21B, the capacitor C76 is electrically connected between the inverting input end and the output end of the operational amplifier U21B, the inverting input end and the output end of the operational amplifier U21B are respectively and correspondingly electrically connected with the pin 1 and the pin 3 of the Schottky diode D11, the pin 2 of the Schottky diode D11 is grounded through the resistor R76, the pin 2 of the Schottky diode D11 is electrically connected with the non-inverting input end of the operational amplifier U22C, the inverting input end of the operational amplifier U22C is electrically connected with the non-inverting input end of the operational amplifier U21B through the resistor R78, the resistor R80 is electrically connected between the inverting input end and the output end of the operational amplifier U22C, the output end of the operational amplifier U22C is electrically connected with the reference signal input end of the main control circuit.
In one or more embodiments of the present invention, as shown in fig. 4, the light source frequency modulation circuit includes a boost chip U2, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a capacitor C5, a capacitor C6, a resistor R1, and a MOS transistor Q1, where a power input end of the boost chip U2 is electrically connected to a +5v output end of the power source circuit, a power input end of the boost chip U2 is grounded through the capacitor C6, two inductance connection ends of the boost chip U2 are respectively electrically connected to two ends of the inductor L1, a ground connection end of the boost chip U2 is electrically connected to a power input end of the light source, an output end of the boost chip U2 is electrically connected to the ground through the capacitor C2, a feedback input end of the boost chip U2 is electrically connected to the resistor R2 through the resistor R3, an enable end of the boost chip U2 is grounded through the capacitor C5, and a MOS transistor Q is electrically connected to a drain electrode of the power source, and a signal input end of the MOS transistor Q1 is electrically connected to a drain electrode of the light source.
The boost chip U2 provides a stable and reliable power supply for the light source, the MOS tube Q1 and the resistor R1 form a switching circuit, and PWM waves output by the main control circuit control the switching frequency of the MOS tube Q1, so that the frequency of the light source is controlled.
In one or more embodiments of the present invention, the environment monitoring circuit includes an air pressure monitoring circuit and a temperature monitoring circuit, and output terminals of the air pressure monitoring circuit and the temperature monitoring circuit are electrically connected to an environment signal input terminal of the main control circuit, respectively. The air pressure monitoring circuit and the temperature monitoring circuit can respectively monitor air pressure information and temperature information in the environment, and the measured gas concentration measured value is corrected by utilizing the environment data, so that higher-precision concentration measured data are obtained, and the use requirements under different scenes are met. In the embodiment of the invention, the air pressure monitoring circuit adopts a high-precision digital air pressure sensor with the model of BMP280 to realize air pressure measurement, and the sensor uses an IIC protocol to carry out data communication with the outside, and has the characteristics of high transmission speed, stable data and the like. The temperature monitoring circuit is only required to adopt the existing temperature sensor, and the description is omitted here.
In one or more embodiments of the present invention, the man-machine interaction circuit includes a key and a display, which are electrically connected to the interaction port of the main control circuit, respectively. The key can be used for inputting a light source frequency setting command, so that the main control circuit can conveniently generate a driving signal according to the light source frequency setting command so as to drive the light source to adjust the frequency, so that the intensity of the infrared light after being partially absorbed is adjusted, and the concentration of different types of gases is measured. The developer can directly display the observation data through the screen and modify the data by using the keys, so that the modification in the program is omitted, the operation of downloading the data onto the development board again is omitted, the development cost is greatly saved, and the service life of the singlechip is prolonged.
In one or more embodiments of the present invention, the embedded system-based non-dispersive infrared gas analysis circuit further comprises a communication circuit, the main control circuit being electrically connected to the communication circuit, the communication circuit being electrically connected to an external receiving terminal. The communication circuit can be directly connected with an external receiving terminal in a communication way, so that data interaction between the communication circuit and the receiving terminal is facilitated, and test data are sent to the receiving terminal so as to perform data analysis and processing in the next step. In the invention, the communication circuit adopts an RS232 serial port communication module, and can be directly connected with a computer to realize communication.
The invention provides a stable and reliable platform for gas analysis experiment tests based on the embedded system non-dispersive infrared gas analysis circuit, has the advantages of adjustable length of the gas chamber, convenient replacement of the detector type, convenient replacement of the light source type, and realization of the operation only by simple steps, thereby greatly reducing the consumption of a great deal of time and material resources because hardware needs to be replaced in the research and development test process, and being capable of replacing and debugging various hardware devices which can be thought of by researchers in a short time, and further shortening the research and development period. The invention also provides a stable and reliable signal processing circuit for processing the output signal of the sensor, has extremely high signal to noise ratio, furthest reserves the output of useful signals and realizes the function of high-precision gas concentration measurement.
The non-dispersive infrared gas analysis circuit based on the embedded system is provided with the gas pressure measurement circuit and the temperature measurement circuit, measures the gas pressure and the temperature of the current environment, and corrects the measured gas concentration value by utilizing the environmental data, thereby obtaining higher-precision concentration measurement data. In addition, a communication circuit and a man-machine interaction circuit are also provided, so that data can be uploaded to an upper computer or directly displayed by using a screen in the development process.
The invention also provides an analysis method based on the embedded system non-dispersive infrared gas analysis circuit, which comprises the following steps:
the analysis circuit is initialized, the detection component detects the target gas in real time to obtain the concentration information of the target gas, and the concentration information is sent to the signal processing circuit;
the signal processing circuit performs signal processing on the concentration information and sends the concentration information to the main control circuit;
the environment monitoring circuit monitors environment information in real time and sends the environment information to the main control circuit;
the main control circuit reads the concentration value of the target gas according to the concentration information after signal processing and directly reads the environmental parameter value according to the environmental information;
The main control circuit performs compensation processing on the concentration value of the target gas according to the environment parameter value, and displays the compensated concentration value and the environment parameter value on a display screen respectively;
the man-machine interaction circuit receives a light source frequency setting command, the main control circuit generates a driving signal according to the light source frequency setting command and sends the driving signal to the light source frequency modulation circuit, the light source frequency modulation circuit adjusts the light source frequency according to the driving signal, and the steps are repeated to obtain an analysis result of the target gas concentration.
According to the analysis method based on the embedded system non-dispersive infrared gas analysis circuit, the infrared light intensity information which is partially absorbed by the target gas is detected through the detection component and is processed by the signal processing circuit, the concentration value of the target gas is calculated by the main control circuit, the main control circuit is combined with the environmental information monitored by the environmental monitoring circuit to carry out compensation processing and display on the concentration value, meanwhile, the man-machine interaction circuit can adjust the frequency of the light source to adjust the infrared light intensity which is partially absorbed, so that the gas concentration analysis result is obtained, the method is applicable to different kinds of gas analysis, the operation is simple, the detection result is accurate, development work is greatly facilitated, and the time cost is saved.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The non-dispersive infrared gas analysis circuit based on the embedded system is characterized in that: the environment monitoring system comprises a detection assembly, a signal processing circuit, a main control circuit, a light source frequency modulation circuit, a light source, an environment monitoring circuit, a man-machine interaction circuit and a power supply circuit, wherein the output end of the detection assembly is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit and the output end of the environment monitoring circuit are respectively electrically connected with the signal input end of the main control circuit, the signal output end of the main control circuit is electrically connected with the input end of the light source frequency modulation circuit, the man-machine interaction circuit is electrically connected with the main control circuit, the output end of the light source frequency modulation circuit is electrically connected with the light source, and the power supply circuit is respectively electrically connected with the signal processing circuit, the main control circuit, the light source frequency modulation circuit, the light source, the man-machine interaction circuit and the environment monitoring circuit;
The detection component is used for detecting the target gas in real time to obtain infrared light intensity information absorbed by the target gas part and sending the infrared light intensity information to the signal processing circuit;
the signal processing circuit is used for performing signal processing on the infrared light intensity information and sending the infrared light intensity information to the main control circuit;
the environment monitoring circuit is used for monitoring environment information in real time and sending the environment information to the main control circuit;
the main control circuit is used for calculating the concentration value of the target gas according to the infrared light intensity information after signal processing and directly reading the environmental parameter value according to the environmental information; the concentration value of the target gas is compensated according to the environment parameter value, and the compensated concentration value and the environment parameter value are respectively displayed on a display screen;
the man-machine interaction circuit receives a light source frequency setting command;
the main control circuit is also used for generating a driving signal according to the light source frequency setting command, controlling the light source frequency modulation circuit to drive the light source to adjust the frequency, and repeatedly cycling in this way to obtain an analysis result of the target gas concentration;
the signal processing circuit comprises a front-end signal conditioning circuit and a rear-end signal conditioning circuit, the front-end signal conditioning circuit comprises a front-end measuring signal conditioning circuit and a front-end reference signal conditioning circuit, and the rear-end signal conditioning circuit comprises a rear-end measuring signal conditioning circuit and a rear-end reference signal conditioning circuit;
The front-end measurement signal conditioning circuit comprises an operational amplifier U17, a resistor R59, a resistor R60, a capacitor C64, a resistor R61 and a capacitor C68, wherein the non-inverting input end of the operational amplifier U17 is electrically connected with the detection signal output end of the detector, the non-inverting input end of the operational amplifier U17 is grounded through the resistor R59, the resistor R60 and the capacitor C64 are sequentially connected in series between the inverting input end of the operational amplifier U17 and the ground, the resistor R61 and the capacitor C68 are connected in parallel between the inverting input end and the output end of the operational amplifier U17, and the output end of the operational amplifier U17 is electrically connected with the input end of the rear-end measurement signal conditioning circuit;
the front-end reference signal conditioning circuit comprises an operational amplifier U19, a resistor R63, a capacitor C70, a resistor R64, a resistor R65 and a capacitor C71, wherein the non-inverting input end of the operational amplifier U19 is electrically connected with the reference signal output end of the detector, the non-inverting input end of the operational amplifier U19 is grounded through the resistor R63, the resistor R64 and the capacitor C70 are sequentially connected in series between the inverting input end of the operational amplifier U19 and the ground, the resistor R65 and the capacitor C71 are connected in parallel between the inverting input end and the output end of the operational amplifier U19, and the output end of the operational amplifier U19 is electrically connected with the input end of the rear-end reference signal conditioning circuit;
The back-end measurement signal conditioning circuit comprises a variable resistor R69, a resistor R71, a capacitor C72, a resistor R66, an operational amplifier U20A, a resistor R73, a capacitor C74, a resistor R67, an operational amplifier U21C, a capacitor C73, a Schottky diode D10, a resistor R68, a resistor R70, an operational amplifier U21D and a resistor R72, the output end of the front end measurement signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20A through the capacitor C72, the non-inverting input end of the operational amplifier U20A is grounded through the resistor R66, the resistor R71 and the variable resistor R69 are serially connected between the inverting input end of the operational amplifier U20A and the ground in sequence, the resistor R73 and the capacitor C74 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U20A, the output end of the operational amplifier U20A is grounded through the resistor R67, the output end of the operational amplifier U20A is electrically connected with the non-inverting input end of the operational amplifier U21C, the capacitor C73 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U21C, the inverting input end and the output end of the operational amplifier U21C are respectively and correspondingly and electrically connected with the No. 1 pin and the No. 3 pin of the Schottky diode D10, the pin 2 of the schottky diode D10 is grounded through the resistor R68, the pin 2 of the schottky diode D10 is electrically connected with the non-inverting input terminal of the operational amplifier U21D, the inverting input terminal of the operational amplifier U21D is electrically connected to the non-inverting input terminal of the operational amplifier U21C through the resistor R70, the resistor R72 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U21D, the output end of the operational amplifier U21D is electrically connected with the measurement signal input end of the main control circuit;
The back-end reference signal conditioning circuit comprises a capacitor C75, a resistor R74, a variable resistor R77, a resistor R79, an operational amplifier U20B, a resistor R81, a capacitor C77, a resistor R75, an operational amplifier U21B, a capacitor C76, a Schottky diode D11, a resistor R76, a resistor R78, an operational amplifier U22C and a resistor R80, the output end of the front-end reference signal conditioning circuit is electrically connected with the non-inverting input end of the operational amplifier U20B through the capacitor C75, the non-inverting input end of the operational amplifier U20B is grounded through the resistor R74, the resistor R79 and the variable resistor R77 are electrically connected between the inverting input end of the operational amplifier U20B and the ground in sequence, the resistor R81 and the capacitor C77 are connected in parallel between the inverting input end and the output end of the operational amplifier U20B, the output end of the operational amplifier U20B is grounded through the resistor R75, the output end of the operational amplifier U20B is electrically connected with the non-inverting input end of the operational amplifier U21B, the capacitor C76 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U21B, the inverting input end and the output end of the operational amplifier U21B are respectively and correspondingly and electrically connected with the No. 1 pin and the No. 3 pin of the Schottky diode D11, the pin 2 of the schottky diode D11 is grounded through the resistor R76, the pin 2 of the schottky diode D11 is electrically connected with the non-inverting input terminal of the operational amplifier U22C, the inverting input terminal of the operational amplifier U22C is electrically connected to the non-inverting input terminal of the operational amplifier U21B through the resistor R78, the resistor R80 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier U22C, the output end of the operational amplifier U22C is electrically connected with the reference signal input end of the main control circuit;
The environment monitoring circuit comprises an air pressure monitoring circuit and a temperature monitoring circuit, and the output ends of the air pressure monitoring circuit and the temperature monitoring circuit are respectively and electrically connected with the environment signal input end of the main control circuit.
2. The embedded system non-dispersive infrared gas analysis circuit according to claim 1, wherein: the detection assembly comprises an air chamber and a detector, wherein an optical channel is arranged between two ends of the air chamber in a penetrating way, the detector and the light source are respectively arranged at two ends of the air chamber in a sealing way, and the optical fiber irradiation emitted by the light source is incident to a receiving area of the detector through the optical channel.
3. The embedded system non-dispersive infrared gas analysis circuit according to claim 1, wherein: the measuring signal output end of the detector is electrically connected with the input end of the front-end measuring signal conditioning circuit, the output end of the front-end measuring signal conditioning circuit is electrically connected with the input end of the rear-end measuring signal conditioning circuit, and the output end of the rear-end measuring signal conditioning circuit is electrically connected with the measuring signal input end of the main control circuit;
the reference signal output end of the detector is electrically connected with the input end of the front-end reference signal conditioning circuit, the output end of the front-end reference signal conditioning circuit is electrically connected with the input end of the rear-end reference signal conditioning circuit, and the output end of the rear-end reference signal conditioning circuit is electrically connected with the reference signal input end of the main control circuit.
4. The embedded system non-dispersive infrared gas analysis circuit according to claim 1, wherein: the light source frequency modulation circuit comprises a boosting chip U2, an inductor L1, a resistor R2, a resistor R3, a capacitor C2, a capacitor C5, a capacitor C6, a resistor R1 and a MOS tube Q1, wherein the power input end of the boosting chip U2 is electrically connected with the +5V output end of the power circuit, the power input end of the boosting chip U2 is grounded through the capacitor C6, two inductance connection ends of the boosting chip U2 are respectively electrically connected with two ends of the inductor L1, the grounding end of the boosting chip U2 is grounded, the output end of the boosting chip U2 is electrically connected with the power input end of a light source, the output end of the boosting chip U2 is grounded through the capacitor C2, the feedback input end of the boosting chip U2 is electrically connected with the feedback input end of the power circuit through the resistor R3, the enabling end of the boosting chip U2 is grounded through the capacitor C5, the grid electrode of the MOS tube Q1 is electrically connected with the output end of the light source, and the MOS tube Q is electrically connected with the drain electrode of the light source.
5. The embedded system non-dispersive infrared gas analysis circuit according to any one of claims 1-4, wherein: the man-machine interaction circuit comprises keys and a display screen, and the keys and the display screen are respectively and electrically connected with the interaction port of the main control circuit.
6. The embedded system non-dispersive infrared gas analysis circuit according to any one of claims 1-4, wherein: the communication device also comprises a communication circuit, wherein the main control circuit is electrically connected with the communication circuit, and the communication circuit is electrically connected with an external receiving terminal.
7. An analysis method based on an embedded system non-dispersive infrared gas analysis circuit, which adopts the embedded system non-dispersive infrared gas analysis circuit according to any one of claims 1 to 6, wherein the method comprises the following steps:
the analysis circuit is initialized, the detection component detects the target gas in real time, and infrared light intensity information absorbed by the target gas part is obtained and sent to the signal processing circuit;
the signal processing circuit performs signal processing on the infrared light intensity information and sends the infrared light intensity information to the main control circuit;
the environment monitoring circuit monitors environment information in real time and sends the environment information to the main control circuit;
The main control circuit calculates the concentration value of the target gas according to the infrared light intensity information after signal processing, and directly reads the environmental parameter value according to the environmental information;
the main control circuit performs compensation processing on the concentration value of the target gas according to the environment parameter value, and displays the compensated concentration value and the environment parameter value on a display screen respectively;
the man-machine interaction circuit receives a light source frequency setting command, the main control circuit generates a driving signal according to the light source frequency setting command and sends the driving signal to the light source frequency modulation circuit, the light source frequency modulation circuit adjusts the light source frequency according to the driving signal, and the steps are repeated to obtain an analysis result of the target gas concentration.
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