CN212059906U - Carbon monoxide detection device - Google Patents
Carbon monoxide detection device Download PDFInfo
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- CN212059906U CN212059906U CN202020507011.XU CN202020507011U CN212059906U CN 212059906 U CN212059906 U CN 212059906U CN 202020507011 U CN202020507011 U CN 202020507011U CN 212059906 U CN212059906 U CN 212059906U
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Abstract
The embodiment of the utility model discloses carbon monoxide detection device. This carbon monoxide detection device includes: the gas detection module comprises a laser, a gas chamber unit and a photoelectric conversion circuit which are sequentially connected, wherein the laser is used for generating a laser signal with a preset wavelength and transmitting the laser signal to the gas chamber unit; the photoelectric conversion circuit is used for detecting the laser signal passing through the air chamber unit and outputting an electric signal; the main control module is connected with the photoelectric conversion circuit and used for collecting the electric signal output by the photoelectric conversion circuit to obtain a detection result of the carbon monoxide; the communication module is connected with the main control module and used for sending the detection result of the carbon monoxide to the target equipment; and the power supply module outputs a first voltage to supply power for the gas detection module and outputs a second voltage to supply power for the main control module and the communication module. The carbon monoxide detection device can realize the online measurement of carbon monoxide, and has the advantages of strong anti-interference performance and high accuracy.
Description
Technical Field
The embodiment of the utility model provides a relate to coal mine system field, especially relate to a carbon monoxide detection device.
Background
The detection of underground environmental parameters is the important factor in the safety production of mines, and particularly, the life safety of operators is directly influenced by the content of underground carbon monoxide. Coal mine accidents are strictly controlled, and the emphasis is on prevention and containment.
At present, the underground carbon monoxide detection in the industry mainly adopts an electrochemical principle, and the electrochemical principle has the following problems: long response time, generally exceeding 15 s; the environmental adaptability is poor, and the influence of water vapor and dust in the environment is easy to happen; is easily affected by background gases in the environment, such as hydrogen sulfide, acetylene and the like, thereby causing the reduction of accuracy; the anti-interference performance is poor, and false alarm is easily generated due to the influence of underground electromagnetic interference because the output signal is smaller.
Based on the above problems, the existing carbon monoxide detection method is difficult to meet the current use requirements.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a carbon monoxide detection device to measure the carbon monoxide in the mine in real time, reliably.
The embodiment of the utility model provides a carbon monoxide detection device, include:
the gas detection module comprises a laser, a gas chamber unit and a photoelectric conversion circuit which are sequentially connected, wherein the laser is used for generating a laser signal with a preset wavelength and transmitting the laser signal to the gas chamber unit; the photoelectric conversion circuit is used for detecting the laser signal passing through the air chamber unit and outputting an electric signal;
the main control module is connected with the photoelectric conversion circuit and used for collecting the electric signal output by the photoelectric conversion circuit to obtain a detection result of the carbon monoxide;
the communication module is connected with the main control module and used for sending the detection result of the carbon monoxide to target equipment;
and the power supply module outputs a first voltage to supply power to the gas detection module and outputs a second voltage to supply power to the main control module and the communication module.
Optionally, the laser device further comprises a current driving module and a temperature control module, wherein the current driving module and the temperature control module are connected with the laser device, and the current driving module and the temperature control module are used for modulating the laser device so as to control the laser device to output the laser signal with the preset wavelength.
Optionally, the photoelectric conversion circuit comprises a photodetector and a signal processing circuit, wherein,
the photoelectric detector is used for receiving the laser signal and converting the laser signal into a current signal;
the signal processing circuit is used for extracting a second harmonic component in the current signal.
Optionally, the communication module includes a wireless communication module and a wired communication module, wherein,
the wireless communication module comprises at least one of a Zigbee communication module, a WiFi communication module, a 3G/4G/5G communication module and a Bluetooth module, and the main control module sends the detection result of the carbon monoxide to the target equipment through the wireless communication module;
the wired communication module comprises at least one of an RS485 serial bus, a CAN bus and an Ethernet, and the main control module is in communication connection with the control host through the wired communication module so as to respond to a control signal of the control host to upgrade and/or transmit a detection result of the carbon monoxide to the control host.
Optionally, the target device includes a monitoring platform and a mobile inspection device,
the main control module sends the detection result of the carbon monoxide to the monitoring platform through the Zigbee communication module, the WiFi communication module or the 3G/4G/5G communication module; and the number of the first and second groups,
the Bluetooth module is matched with the mobile inspection equipment, and after the matching is successful, the detection result of the carbon monoxide is sent to the mobile inspection equipment.
Optionally, the power module includes a slow start module and a voltage conversion module, an input end of the slow start module is connected to the input power supply, an output end of the slow start module is connected to an input end of the voltage conversion module, and the voltage conversion module outputs the first voltage and the second voltage.
Optionally, the slow start module includes a voltage stabilizing circuit, an operational amplifier and a switch circuit, an input end of the voltage stabilizing circuit is connected to the input power supply, and a first output end of the voltage stabilizing circuit is connected to a non-inverting input end of the operational amplifier; the reverse input end of the operational amplifier is connected with the voltage output end of the slow start module; the output end of the operational amplifier is connected with the control end of the switch circuit;
the input end of the switch circuit is connected with the second output end of the voltage stabilizing circuit, and the output end of the switch circuit is connected with the voltage output end of the slow start module; the switch circuit is used for controlling the connection or disconnection between the input end and the output end according to the signal of the control end;
the voltage conversion module comprises a first voltage conversion module and a second voltage conversion module, the input end of the first voltage conversion module is connected with the voltage output end of the slow start module, and the output end of the first voltage conversion module outputs the first voltage; the input end of the second voltage conversion module is connected with the output end of the first voltage conversion module, and the output end of the second voltage conversion module outputs the second voltage.
Optionally, the switch circuit includes a first resistor, a second resistor, a light emitting diode, and a MOS transistor, wherein,
the cathode of the light-emitting diode is connected with the output end of the operational amplifier, and the anode of the light-emitting diode is connected with the grid electrode of the MOS tube;
the first pole of the MOS tube is connected with the second output end of the voltage stabilizing circuit, and the second pole of the MOS tube is connected with the voltage output end of the slow start module;
the first end of the first resistor is connected with the first pole of the MOS tube, and the second end of the first resistor is connected with the second pole of the MOS tube;
the first end of the second resistor is connected with the anode of the light emitting diode, and the second end of the second resistor is connected with the second output end of the voltage stabilizing circuit.
Optionally, the voltage stabilizing circuit includes a first voltage stabilizing module and a second voltage stabilizing module, an input end of the first voltage stabilizing module is connected to the input power supply, and an output end of the first voltage stabilizing module is connected to an input end of the second voltage stabilizing module through a voltage dividing resistor; the output end of the first voltage stabilizing module is used as the second output end of the voltage stabilizing circuit, the output end of the second voltage stabilizing module is used as the first output end of the voltage stabilizing circuit, wherein,
the first voltage stabilizing module comprises a voltage stabilizing diode and a rectifier diode, the negative electrode of the voltage stabilizing diode is connected with the input end of the first voltage stabilizing module, and the positive electrode of the voltage stabilizing diode is grounded; the anode of the rectifier diode is connected with the input end of the first voltage stabilizing module, and the cathode of the rectifier diode is connected with the output end of the first voltage stabilizing module;
the second voltage stabilizing module comprises a voltage stabilizing chip, a capacitor, a first proportional resistor and a second proportional resistor; the first end of the voltage stabilizing chip is connected with the input end of the second voltage stabilizing module, the second end of the voltage stabilizing chip is grounded, and the reference end of the voltage stabilizing chip is connected with the first end of the first proportional resistor and the first end of the second proportional resistor;
the first end of the capacitor is connected with the reference end of the voltage stabilizing chip, and the second end of the capacitor is grounded;
and the second end of the first proportional resistor is connected with the output end of the second voltage stabilizing module, and the second end of the second proportional resistor is grounded.
Optionally, the power supply module further comprises a display module and an alarm module, the display module is electrically connected to the main control module, and the display module is configured to display a current detection result and a historical detection result of the carbon monoxide, and display current electric quantity information of the power supply module collected by the main control module;
the alarm module is connected with the main control module and used for carrying out sound and/or light alarm when receiving the trigger signal output by the main control module.
The embodiment of the utility model provides a carbon monoxide detection device, through setting up the laser instrument and producing the laser signal who predetermines the wavelength, absorb this laser signal who predetermines the wavelength by the air chamber unit, the laser signal after the absorption is converted into the signal of telecommunication by photoelectric conversion circuit, host system handles the signal of telecommunication that the conversion obtained, obtain the testing result of carbon monoxide, rethread communication module sends the testing result of carbon monoxide to target equipment, make target equipment can acquire the carbon monoxide information of each branch station in the pit in real time. Meanwhile, the power supply module is arranged in the carbon monoxide detection device to supply power to the functional modules, so that the carbon monoxide detection device can work normally. The embodiment of the utility model provides an adopt laser spectrum absorption technique not only to realize the on-line measuring to carbon monoxide, generate the narrowband laser signal that corresponds to carbon monoxide absorption wave band through modulating the laser instrument moreover to make the testing result not disturbed by the background gas, interference immunity is strong and has improved the accuracy that detects carbon monoxide.
Drawings
Fig. 1 is a block diagram of a carbon monoxide detection apparatus according to an embodiment of the present invention;
fig. 2 is a block diagram illustrating another embodiment of a carbon monoxide detecting device according to the present invention;
fig. 3 is a block diagram illustrating another embodiment of a carbon monoxide detecting device according to the present invention;
fig. 4 is a block diagram illustrating another embodiment of a carbon monoxide detecting device according to the present invention;
fig. 5 is a block diagram illustrating another embodiment of a carbon monoxide detecting device according to the present invention;
fig. 6 is a block diagram illustrating another embodiment of a carbon monoxide detecting device according to the present invention;
fig. 7 is a block diagram of another carbon monoxide detection device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a block diagram of a carbon monoxide detection device according to an embodiment of the present invention. Referring to fig. 1, the carbon monoxide detection apparatus includes:
the gas detection module 10, the gas detection module 10 includes a laser 110, a gas chamber unit 120 and a photoelectric conversion circuit 130 connected in sequence, the laser 110 is configured to generate a laser signal with a preset wavelength, and transmit the laser signal to the gas chamber unit 120; the photoelectric conversion circuit 130 is used for detecting the laser signal passing through the air chamber unit 120 and outputting an electrical signal;
the main control module 20 is connected to the photoelectric conversion circuit 130, and is configured to collect an electrical signal output by the photoelectric conversion circuit 130, and obtain a detection result of carbon monoxide;
the communication module 30 is connected with the main control module 20 and is used for sending the detection result of the carbon monoxide to the target equipment;
and the power supply module 40 outputs a first voltage to supply power to the gas detection module 10 and outputs a second voltage to supply power to the main control module 20 and the communication module 30.
Specifically, the preset wavelength corresponds to the absorption wavelength of the carbon monoxide gas, and the main control module 20 generates a laser signal with the preset wavelength by controlling the laser 110 to generate a narrow-band laser signal, so that the carbon monoxide in the well can perform spectral absorption on the generated laser signal, and the concentration of the carbon monoxide can be detected according to the light intensity change of the laser signal before and after absorption. The predetermined wavelength may be a range of wavelengths, for example, giving a certain amount of redundancy on the basis of the center wavelength. In one embodiment, the predetermined wavelength has a center wavelength of 2330 nm.
The gas chamber unit 120 is configured to control the laser signal to propagate according to a preset gas path, so that after passing through the gas chamber unit 120, according to the langebir law, a part of the laser signal is absorbed by carbon monoxide in the gas chamber unit 120, and thus the light intensity of the laser signal output by the gas chamber unit 120 is reduced, and the laser signal with the reduced light intensity is used for subsequently determining the concentration of the carbon monoxide.
Alternatively, the gas cell unit 120 is generally composed of an input lens and an output lens. In one embodiment, the gas cell unit 120 includes an input optical fiber, an output optical fiber, and a lens group, and light emitted from the input optical fiber is collimated by the input lens into parallel light, passes through the gas cell unit 120, and is coupled to the output optical fiber by the output lens for output.
The photoelectric conversion circuit 130 is configured to convert the detected laser signal into a corresponding electrical signal, and then output the electrical signal to the main control module 20 for calculation to determine the concentration of carbon monoxide.
The main control module 20 performs deviation calculation on the laser signal absorbed by the carbon monoxide gas and the ideal value when the laser signal is not absorbed based on the langerbi law to obtain a concentration value of the carbon monoxide, which is a detection result of the carbon monoxide.
The communication module 30 is configured to send a detection result of carbon monoxide to the target device in real time, so as to implement online measurement of carbon monoxide. In one embodiment, the communication module 30 includes a wired communication module and a wireless communication module, wherein,
the wireless communication module comprises at least one of a Zigbee communication module, a WiFi communication module, a 3G/4G/5G communication module and a Bluetooth module, and the main control module 20 sends the detection result of the carbon monoxide to the target equipment through the wireless communication module;
the wired communication module comprises at least one of an RS485 serial bus, a CAN bus and an Ethernet, and the main control module 20 is in communication connection with the control host through the wired communication module so as to respond to a control signal of the control host to update and/or transmit a detection result of carbon monoxide to the control host.
In particular, a construction site will typically include more than one carbon monoxide detection device to detect carbon monoxide concentration information at different locations. Through set up wireless communication module and wired communication module in carbon monoxide detection device for the carbon monoxide detection device who lays at different underground substations can communicate the network deployment with each target equipment, forms communication network, and at this moment, each carbon monoxide detection device is equivalent to the network node, thereby through the communication network who establishes, the target equipment can acquire the concentration information of the carbon monoxide of each underground substation in real time.
In this embodiment, the target device includes a monitoring platform and a mobile inspection device, wherein the main control module 20 sends the detection result of carbon monoxide to the monitoring platform through a Zigbee communication module, a WiFi communication module, or a 3G/4G/5G communication module.
Meanwhile, the main control module 20 matches the mobile inspection device through the bluetooth module, and sends the detection result of the carbon monoxide to the mobile inspection device after the matching is successful. For example, when the appearance is examined to handheld tile of tile inspector arrival monitoring place, carbon monoxide detection device examines appearance automatic connection through built-in bluetooth module and tile, and after connecting successfully, carbon monoxide detection device examines the appearance with carbon monoxide concentration value transmission to tile, realizes wireless intelligence and patrols and examines.
The carbon monoxide detection device is provided with the multiple wireless communication modules, so that the carbon monoxide detection device can comprehensively judge and automatically select according to multiple factors such as the arranged position, the distance to the target equipment, the network state of the current position and the like, the carbon monoxide detection device can be connected to a communication network, and reliable communication with the target equipment is realized.
Optionally, the main control module 20 in the carbon monoxide detection apparatus may communicate with the control host based on the wired communication module, so as to respond to a software upgrading instruction of the control host, and implement online upgrading of software of the main control module 20.
The embodiment of the utility model provides a carbon monoxide detection device, through setting up the laser instrument and producing the laser signal who predetermines the wavelength, absorb this laser signal who predetermines the wavelength by the air chamber unit, the laser signal after the absorption is converted into the signal of telecommunication by photoelectric conversion circuit, host system handles the signal of telecommunication that the conversion obtained, obtain the testing result of carbon monoxide, rethread communication module sends the testing result of carbon monoxide to target equipment, make target equipment can acquire the carbon monoxide information of each branch station in the pit in real time. Meanwhile, the power supply module is arranged in the carbon monoxide detection device to supply power to the functional modules, so that the carbon monoxide detection device can work normally. The embodiment of the utility model provides an adopt laser spectrum absorption technique not only to realize the on-line measuring to carbon monoxide, generate the narrowband laser signal that corresponds to carbon monoxide absorption wave band through modulating the laser instrument moreover to make the testing result not disturbed by the background gas, interference immunity is strong and has improved the accuracy that detects carbon monoxide.
Optionally, fig. 2 is a block diagram of another carbon monoxide detection apparatus according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 2, the carbon monoxide detection apparatus further includes: the laser driving device comprises a current driving module 50 and a temperature control module 60, wherein the current driving module 50 and the temperature control module 60 are connected with the laser 110, and the current driving module 50 and the temperature control module 60 are used for modulating the laser 110 so as to control the laser 110 to output a laser signal with a preset wavelength.
Specifically, laser 110 is a tunable semiconductor laser, which typically may include: a light source having an active gain region and a resonant cavity; a frequency selective device for changing and selecting a target wavelength; and an output device capable of stably outputting the set wavelength.
The current driving module 50 and the temperature control module 60 are connected to the laser 110, so that the master controller can drive the semiconductor laser to generate a laser signal with a preset wavelength through the current driving module 50 and the temperature control module 60.
Optionally, with continued reference to fig. 2, on the basis of the above-described embodiment, the photoelectric conversion circuit 130 includes a photodetector and a signal processing circuit, wherein,
the photoelectric detector is used for receiving the laser signal and converting the laser signal into a current signal;
the signal processing circuit is used for extracting a second harmonic component in the current signal.
Specifically, the photodetector is a junction point of an optical path and a circuit, and is used for converting a detected laser signal into a current signal to complete photoelectric conversion.
The signal processing circuit is used for extracting a second harmonic component in the current signal after filtering the current signal, and the second harmonic component reflects the amplitude change of the signal, so the concentration of the carbon monoxide can be calculated by performing amplitude processing on the second harmonic component output by the signal processing circuit in a main control mode.
Optionally, a pre-amplification circuit is further disposed between the photodetector and the signal processing circuit, and configured to amplify the current signal output by the photodetector, and accordingly, the signal processing circuit performs signal processing according to the amplified current signal.
Optionally, fig. 3 is a block diagram of another carbon monoxide detection apparatus according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 3, the power module 40 includes a soft start module 410 and a voltage conversion module 420, an input terminal of the soft start module 410 is connected to the input power Vin, an output terminal of the soft start module 410 is connected to an input terminal of the voltage conversion module 420, and the voltage conversion module 420 outputs the first voltage Vout1 and the second voltage Vout 2.
Specifically, the slow start module 410 is configured to provide a large current protection for each functional module when the carbon monoxide detection apparatus is powered on and started, so as to prevent the large current generated at the moment of powering on from damaging each functional module. The slow start module 410 performs following detection on the output voltage, and when the output voltage reaches the start requirement voltage of the voltage conversion module 420, the slow start module 410 completes start, and at this time, the voltage conversion module 420 starts to work normally.
The voltage conversion module 420 outputs two voltages, a first voltage Vout1 and a second voltage Vout2, for powering different devices. Optionally, the first voltage Vout1 in this embodiment is +5V, and the second voltage Vout2 is + 3.3V.
Optionally, fig. 4 is a block diagram of another carbon monoxide detection apparatus according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 4, the slow start module 410 includes a voltage stabilizing circuit 411, an operational amplifier U1 and a switch circuit 412, wherein an input end of the voltage stabilizing circuit 411 is connected to the input power Vin, and a first output end of the voltage stabilizing circuit 411 is connected to a non-inverting input end of the operational amplifier U1; the reverse input end of the operational amplifier U1 is connected with the voltage output end of the slow start module 410; the output end of the operational amplifier U1 is connected with the control end of the switch circuit 412;
the input end of the switch circuit 412 is connected to the second output end of the voltage stabilizing circuit 411, and the output end of the switch circuit 412 is connected to the voltage output end of the soft start module 410; the switch circuit 412 is used for controlling the connection or disconnection between the input end and the output end according to the signal of the control end;
the voltage conversion module 420 comprises a first voltage conversion module and a second voltage conversion module, wherein the input end of the first voltage conversion module is connected with the voltage output end of the slow start module 410, and the output end of the first voltage conversion module outputs a first voltage Vout 1; the input end of the second voltage conversion module is connected with the output end of the first voltage conversion module, and the output end of the second voltage conversion module outputs a second voltage Vout 2.
Specifically, the voltage stabilizing circuit 411 is used for performing voltage stabilization processing on the input voltage, and providing a stable power supply voltage for the electrical appliance. In this embodiment, the first output terminal and the second output terminal of the voltage stabilizing circuit 411 have different output voltages to respectively supply power to the operational amplifier U1 and the switch circuit 412.
When the output voltage of the slow start module 410 is lower than the set voltage of the start voltage conversion module 420, the operational amplifier U1 outputs a high level, at this time, the switch circuit 412 connected to the output end of the operational amplifier does not work, and the output voltage of the slow start module 410 does not reach the start voltage of the voltage conversion module 420, so that the voltage conversion circuit cannot be started; when the output voltage of the slow start module 410 is higher than the set voltage, the operational amplifier U1 outputs a low level, the switch circuit 412 connected to the output terminal of the operational amplifier U1 starts to operate, the slow start circuit completes the start, the second output terminal of the voltage stabilizing circuit 411 outputs a stable voltage through the switch circuit 412 to supply power to the voltage converting circuit, and the power module 40 operates normally.
The output voltage of the first voltage conversion module in the voltage conversion module 420 supplies power to the second voltage conversion module on the one hand and supplies power to the gas detection module 10 on the other hand. The second voltage Vout2 output by the second voltage conversion module powers other components and/or modules in the carbon monoxide detection device. The first voltage conversion module and the second voltage conversion module can be implemented by using integrated devices, and in one embodiment, the first voltage conversion module is an LM7805 type power supply chip, and the second voltage conversion module is an XC6209F332 type linear power supply.
Optionally, fig. 5 is a block diagram of another carbon monoxide detection apparatus according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 5, the switch circuit 412 includes the first resistor R1, the second resistor R2, the light emitting diode LED1 and the MOS transistor Q1, wherein,
the cathode of the light emitting diode LED1 is connected with the output end of the operational amplifier U1, and the anode of the light emitting diode LED1 is connected with the grid of the MOS tube Q1;
a first pole of the MOS transistor Q1 is connected to the second output end of the voltage stabilizing circuit 411, and a second pole of the MOS transistor Q1 is connected to the voltage output end of the soft start module 410;
a first end of the first resistor R1 is connected with a first pole of the MOS transistor Q1, and a second end of the first resistor R1 is connected with a second pole of the MOS transistor Q1;
a first end of the second resistor R2 is connected to the anode of the LED1, and a second end of the second resistor R2 is connected to a second output end of the stabilizing circuit 411.
Specifically, the first resistor R1 functions as a current limiting function for limiting a large current at the time of power-on start. The second resistor R2 is used to protect the light emitting diode LED 1.
The cathode of the LED1 is connected to the output of the op-amp U1, so that when the op-amp U1 outputs a high level, the LED1 is in the off state, and thus the switch circuit 412 is in the off state. When the operational amplifier U1 outputs a low level, the light emitting diode LED1 is turned on, and accordingly, the MOS transistor Q1 connected thereto is turned on, and at this time, the output voltage of the second voltage output terminal of the voltage stabilizing circuit 411 is output to the voltage converting module 420 through the MOS transistor Q1, so as to supply power to the voltage converting module 420 normally.
Optionally, fig. 6 is a block diagram of another carbon monoxide detection device according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 6, the voltage stabilizing circuit 411 includes a first voltage stabilizing module and a second voltage stabilizing module, an input end of the first voltage stabilizing module is connected to the input power Vin, and an output end of the first voltage stabilizing module is connected to an input end of the second voltage stabilizing module through a voltage dividing resistor R5; the output terminal of the first voltage stabilizing module is used as the second output terminal of the voltage stabilizing circuit 411, the output terminal of the second voltage stabilizing module is used as the first output terminal of the voltage stabilizing circuit 411, wherein,
the first voltage stabilizing module comprises a voltage stabilizing diode Z1 and a rectifier diode D1, the negative electrode of the voltage stabilizing diode Z1 is connected with the input end of the first voltage stabilizing module, and the positive electrode of the voltage stabilizing diode Z1 is grounded; the anode of the rectifier diode D1 is connected with the input end of the first voltage stabilizing module, and the cathode of the rectifier diode D1 is connected with the output end of the first voltage stabilizing module;
the second voltage stabilizing module comprises a voltage stabilizing chip Z2, a capacitor, a first proportional resistor R3 and a second proportional resistor R4; the first end of the voltage stabilizing chip Z2 is connected with the input end of the second voltage stabilizing module, the second end of the voltage stabilizing chip Z2 is grounded, and the reference end of the voltage stabilizing chip Z2 is connected with the first end of the first proportional resistor R3 and the first end of the second proportional resistor R4;
the first end of the capacitor is connected with the reference end of the voltage stabilizing chip Z2, and the second end of the capacitor is grounded;
the second end of the first proportional resistor R3 is connected to the output end of the second voltage stabilizing module, and the second end of the second proportional resistor R4 is grounded.
Specifically, the first voltage regulation module regulates the input voltage through a voltage regulation diode Z1 and outputs the regulated input voltage, and then outputs a dc power supply signal through a rectifier diode D1.
The second voltage stabilizing module is used for providing a stable reference voltage for the operational amplifier U1, and ensuring that the operational amplifier U1 can work normally. The output voltage of the regulator chip Z2 is the output voltage of the second regulator module. By adjusting the ratio of the first proportional resistor R3 and the second proportional resistor R4, the output voltage of the regulator chip Z2 can be adjusted. In an alternative implementation manner of this embodiment, the voltage regulation chip Z2 adopts a TL431 type voltage regulation chip, and the resistance ratio of the first proportional resistor R3 and the second proportional resistor R4 is set to 1:1 by adjustment, so that the voltage regulation chip Z2 outputs a +5V voltage as the reference voltage of the operational amplifier U1.
Optionally, fig. 7 is a block diagram of another carbon monoxide detection apparatus according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 7, the system further includes a display module 70 and an alarm module 80, the display module 70 is electrically connected to the main control module 20, and the display module 70 is configured to display a current detection result and a historical detection result of carbon monoxide, and display current electric quantity information of the power supply module 40 acquired by the main control module 20;
the alarm module 80 is connected to the main control module 20 and configured to perform an acoustic and/or optical alarm when receiving the trigger signal output by the main control module 20.
Specifically, the display module 70 may be, for example, a display screen, and by configuring the display screen, it is convenient for a field worker to check the current carbon monoxide concentration information in time. The display content of the display module 70 can be adjusted and customized according to the requirement, for example, the current carbon monoxide value, the historical value of carbon monoxide, the alarm threshold value, the electric quantity value, the working state and the communication state of the power supply module 40, and the like can be displayed.
The alarm module 80 may be, for example, a buzzer and/or a light emitting diode to perform a buzzer alarm and/or a light emitting alarm. The alarm module 80 can alarm according to different levels to facilitate the distinction of field workers. In an alternative embodiment, the alarm level is classified into 4 levels, and the higher the carbon monoxide concentration is, the higher the alarm level is, and the highest level is 1 level alarm. For example, when the concentration of carbon monoxide reaches the first level concentration threshold, the main control module 20 outputs a first level alarm trigger signal, and at this time, the alarm module 80 may alarm at a high frequency according to a sudden sound. The alarm mode can be adjusted according to the construction standard, and the embodiment does not limit the alarm mode.
On the basis of above-mentioned embodiment, it is optional, the embodiment of the utility model provides a carbon monoxide detection device still includes storage module, and storage module mainly used storage sensor marks numerical value, alarm value, historical data etc.. The historical data may include historical reports and historical curves. The history may be displayed with time on the abscissa and carbon monoxide on the ordinate, for example.
On the basis of above-mentioned embodiment, it is optional, the utility model provides a carbon monoxide detection device possesses self-diagnostic function, when diagnostic result shows that there is sensor memory chip trouble, or light path trouble, or communication fault wait trouble, all can export corresponding trouble prompt information through host system.
On the basis of above-mentioned embodiment, it is optional, the embodiment of the utility model provides a carbon monoxide detection device possesses the calibration and reminds the function, can carry out the time record automatically when the sensor is first after calibrating, carries out the calibration and reminds before reaching fixed date, for example, carries out the calibration and reminds 3 days before reaching the regulation date.
On the basis of above-mentioned embodiment, it is optional, the utility model provides a carbon monoxide detection device possesses pseudo-data recognition function, and specifically, the inside storage of sensor has the undulant model of sensor numerical value, and when the sensor produced abnormal data because external disturbance or other reasons, the sensor can carry out data identification according to the undulant model of sensor numerical value who stores, rejects pseudo-data, ensures the accuracy of carbon monoxide testing result.
The embodiment of the utility model provides a carbon monoxide detection device, carry out on-line measuring to carbon monoxide based on laser spectrum absorption technique, compare with traditional electrochemistry measurement method, have the advantage that measurement linearity is good and the interference killing feature is strong; meanwhile, the method has the advantage of long service life because of adopting non-contact measurement. Through configuration wired communication module and wireless communication module in carbon monoxide detection device for carbon monoxide detection device has multiple communication mode and carries out data interaction with the target device, and can respond to the upgrading instruction of control host computer in real time, carries out online upgrading, can greatly promote the availability factor of equipment.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A carbon monoxide detection apparatus, comprising:
the gas detection module comprises a laser, a gas chamber unit and a photoelectric conversion circuit which are sequentially connected, wherein the laser is used for generating a laser signal with a preset wavelength and transmitting the laser signal to the gas chamber unit; the photoelectric conversion circuit is used for detecting the laser signal passing through the air chamber unit and outputting an electric signal;
the main control module is connected with the photoelectric conversion circuit and used for collecting the electric signal output by the photoelectric conversion circuit to obtain a detection result of the carbon monoxide;
the communication module is connected with the main control module and used for sending the detection result of the carbon monoxide to target equipment;
and the power supply module outputs a first voltage to supply power to the gas detection module and outputs a second voltage to supply power to the main control module and the communication module.
2. The carbon monoxide detection device according to claim 1, further comprising a current driving module and a temperature control module, wherein the current driving module and the temperature control module are connected to the laser, and the current driving module and the temperature control module are configured to modulate the laser to control the laser to output the laser signal with the preset wavelength.
3. The carbon monoxide detection device according to claim 1, wherein the photoelectric conversion circuit comprises a photodetector and a signal processing circuit, wherein,
the photoelectric detector is used for receiving the laser signal and converting the laser signal into a current signal;
the signal processing circuit is used for extracting a second harmonic component in the current signal.
4. The carbon monoxide detection device of claim 1, wherein the communication module comprises a wireless communication module and a wired communication module, wherein,
the wireless communication module comprises at least one of a Zigbee communication module, a WiFi communication module, a 3G/4G/5G communication module and a Bluetooth module, and the main control module sends the detection result of the carbon monoxide to the target equipment through the wireless communication module;
the wired communication module comprises at least one of an RS485 serial bus, a CAN bus and an Ethernet, and the main control module is in communication connection with the control host through the wired communication module so as to respond to a control signal of the control host to upgrade and/or transmit a detection result of the carbon monoxide to the control host.
5. The carbon monoxide detection apparatus according to claim 4, wherein the target device comprises a monitoring platform and a mobile inspection device,
the main control module sends the detection result of the carbon monoxide to the monitoring platform through the Zigbee communication module, the WiFi communication module or the 3G/4G/5G communication module; and the number of the first and second groups,
the Bluetooth module is matched with the mobile inspection equipment, and after the matching is successful, the detection result of the carbon monoxide is sent to the mobile inspection equipment.
6. The carbon monoxide detection device according to claim 1, wherein the power supply module comprises a slow start module and a voltage conversion module, an input end of the slow start module is connected with an input power supply, an output end of the slow start module is connected with an input end of the voltage conversion module, and the voltage conversion module outputs the first voltage and the second voltage.
7. The carbon monoxide detection device according to claim 6, wherein the slow start module comprises a voltage stabilizing circuit, an operational amplifier and a switch circuit, an input end of the voltage stabilizing circuit is connected with the input power supply, and a first output end of the voltage stabilizing circuit is connected with a non-inverting input end of the operational amplifier; the reverse input end of the operational amplifier is connected with the voltage output end of the slow start module; the output end of the operational amplifier is connected with the control end of the switch circuit;
the input end of the switch circuit is connected with the second output end of the voltage stabilizing circuit, and the output end of the switch circuit is connected with the voltage output end of the slow start module; the switch circuit is used for controlling the connection or disconnection between the input end and the output end according to the signal of the control end;
the voltage conversion module comprises a first voltage conversion module and a second voltage conversion module, the input end of the first voltage conversion module is connected with the voltage output end of the slow start module, and the output end of the first voltage conversion module outputs the first voltage; the input end of the second voltage conversion module is connected with the output end of the first voltage conversion module, and the output end of the second voltage conversion module outputs the second voltage.
8. The apparatus of claim 7, wherein the switching circuit comprises a first resistor, a second resistor, a light emitting diode and a MOS transistor, wherein,
the cathode of the light-emitting diode is connected with the output end of the operational amplifier, and the anode of the light-emitting diode is connected with the grid electrode of the MOS tube;
the first pole of the MOS tube is connected with the second output end of the voltage stabilizing circuit, and the second pole of the MOS tube is connected with the voltage output end of the slow start module;
the first end of the first resistor is connected with the first pole of the MOS tube, and the second end of the first resistor is connected with the second pole of the MOS tube;
the first end of the second resistor is connected with the anode of the light emitting diode, and the second end of the second resistor is connected with the second output end of the voltage stabilizing circuit.
9. The carbon monoxide detection device according to claim 7, wherein the voltage stabilizing circuit comprises a first voltage stabilizing module and a second voltage stabilizing module, an input end of the first voltage stabilizing module is connected with the input power supply, and an output end of the first voltage stabilizing module is connected with an input end of the second voltage stabilizing module through a voltage dividing resistor; the output end of the first voltage stabilizing module is used as the second output end of the voltage stabilizing circuit, the output end of the second voltage stabilizing module is used as the first output end of the voltage stabilizing circuit, wherein,
the first voltage stabilizing module comprises a voltage stabilizing diode and a rectifier diode, the negative electrode of the voltage stabilizing diode is connected with the input end of the first voltage stabilizing module, and the positive electrode of the voltage stabilizing diode is grounded; the anode of the rectifier diode is connected with the input end of the first voltage stabilizing module, and the cathode of the rectifier diode is connected with the output end of the first voltage stabilizing module;
the second voltage stabilizing module comprises a voltage stabilizing chip, a capacitor, a first proportional resistor and a second proportional resistor; the first end of the voltage stabilizing chip is connected with the input end of the second voltage stabilizing module, the second end of the voltage stabilizing chip is grounded, and the reference end of the voltage stabilizing chip is connected with the first end of the first proportional resistor and the first end of the second proportional resistor;
the first end of the capacitor is connected with the reference end of the voltage stabilizing chip, and the second end of the capacitor is grounded;
and the second end of the first proportional resistor is connected with the output end of the second voltage stabilizing module, and the second end of the second proportional resistor is grounded.
10. The carbon monoxide detection device according to claim 1, further comprising a display module and an alarm module, wherein the display module is electrically connected to the main control module, and is used for displaying a current detection result and a historical detection result of the carbon monoxide and displaying current electric quantity information of the power supply module collected by the main control module;
the alarm module is connected with the main control module and used for carrying out sound and/or light alarm when receiving the trigger signal output by the main control module.
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| CN202020507011.XU CN212059906U (en) | 2020-04-09 | 2020-04-09 | Carbon monoxide detection device |
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