CN213935142U - Compound anti-interference flame detector based on semiconductor ultraviolet sensor - Google Patents
Compound anti-interference flame detector based on semiconductor ultraviolet sensor Download PDFInfo
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- CN213935142U CN213935142U CN202023022299.0U CN202023022299U CN213935142U CN 213935142 U CN213935142 U CN 213935142U CN 202023022299 U CN202023022299 U CN 202023022299U CN 213935142 U CN213935142 U CN 213935142U
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Abstract
The utility model relates to a compound anti-interference flame detector based on semiconductor ultraviolet sensor, the compound sensing mode that adopts single ultraviolet sensor and two infrared sensor detects flame radiation, filter structural design filtering interference light has been used at the ultraviolet sensor end, can effectively resist the sunlight, interference such as camera flash light, have better perceptibility to flame characteristic radiation wave band, methods such as utilize flame scintillation frequency analysis and threshold value to differentiate simultaneously, make the system possess excellent interference killing feature and higher detection precision, and avoided using high voltage power supply, can save high-pressure module circuit, the miniaturization of detector has been realized, and the safety is higher, thereby can use in more extensive fire monitoring scene. Compared with the prior art, the flame detector has the advantages of safety, long service life and small volume.
Description
Technical Field
The utility model relates to a fire control safety field especially relates to a compound anti-interference flame detector based on semiconductor ultraviolet sensor.
Background
When a fire occurs, substances are ignited and burnt, the temperature of an ignition point is raised, and meanwhile, heat radiation electromagnetic rays are emitted to an external space, and the electromagnetic rays generally display frequency spectrum characteristics related to the materials and the temperature of the ignition substances at an infrared ray end or an ultraviolet ray end, so that whether the fire occurs or not can be judged by monitoring the frequency spectrum characteristics of rising and falling of heat radiation in the environment.
The optical flame detector monitors infrared rays or ultraviolet rays in the environment by using an optical sensor, and judges whether a fire occurs according to the signal change condition of the sensor. The optical flame detector has the advantages of high response speed, capability of working under extreme conditions and the like.
The existing optical flame detector utilizes an infrared sensor to detect infrared rays to monitor the fire, but because the non-carbon-containing substances are burnt, the infrared rays are rarely radiated, the flame detector can not detect the burning of the non-carbon-containing substances such as hydrogen, phosphorus, metal lithium and the like;
the fire condition is monitored by monitoring ultraviolet rays by utilizing the vacuum ultraviolet sensor, even the fire condition is monitored by using a composite detector formed by combining a plurality of infrared sensors and the vacuum ultraviolet sensor, although the problem of detecting the combustion of non-carbon-containing substances can be solved, the range of the wavelength of the detected ultraviolet rays is narrow due to the adoption of the vacuum ultraviolet sensor, a high-voltage power supply unit is additionally provided for the vacuum ultraviolet sensor, the voltage is usually up to 300V, the problem of power supply safety is brought to the application of the detector, and the overall detection system is overlarge due to the large volume of the vacuum tube, so that the application scene is limited.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect of the prior art, the utility model provides a compound flame detector based on semiconductor ultraviolet sensor solves being difficult to the miniaturization of compound flame detector, surveys the narrow, anti-interference poor problem of cover wavelength.
The purpose of the utility model is mainly realized through the following technical scheme:
the utility model provides a composite anti-interference flame detector based on a semiconductor ultraviolet sensor, which comprises a first infrared sensing unit, a second infrared sensing unit, a semiconductor ultraviolet sensing unit and a digital control unit; wherein the content of the first and second substances,
the first infrared sensing unit comprises a 2.75um waveband infrared sensor and a first filtering and amplifying circuit which are sequentially connected;
the second infrared sensing unit comprises a 4.35um waveband infrared sensor and a second filtering and amplifying circuit which are sequentially connected;
the semiconductor ultraviolet sensing unit comprises a semiconductor ultraviolet sensor and a third filtering and amplifying circuit which are sequentially connected; an anti-interference optical filter is arranged outside a photosensitive window of the semiconductor ultraviolet sensor;
and the output ends of the first filtering and amplifying circuit, the second filtering and amplifying circuit and the third filtering and amplifying circuit are respectively and electrically connected with the digital control unit.
Further, the first filtering and amplifying circuit comprises a voltage dividing resistor, a potentiometer, a first amplifier, a second amplifier and a third amplifier; wherein the content of the first and second substances,
one end of the divider resistor is electrically connected with the output end of the infrared sensor and the positive input end of the first amplifier, and the other end of the divider resistor is grounded;
the negative input end and the output end of the first amplifier are both connected with the positive input end of the second amplifier;
the negative input end of the second amplifier is connected with one end of the potentiometer, the other end of the potentiometer is grounded, and the output end of the second amplifier is connected with the positive input end of the third amplifier;
and the negative input end of the third amplifier is connected with the output end of the third amplifier and is used as the output end of the first filtering and amplifying circuit.
Further, the second filtering and amplifying circuit and the first filtering and amplifying circuit have the same circuit structure.
Further, the third filtering and amplifying circuit comprises a fourth amplifier, a capacitor, a first resistor, a second resistor and a third resistor; wherein the content of the first and second substances,
the positive input end and the negative input end of the fourth amplifier are respectively connected with two signal ends of the ultraviolet sensor, the positive input end of the fourth amplifier is also grounded, and the negative input end of the fourth amplifier is also connected with one end of the capacitor;
the other end of the capacitor is simultaneously connected with one end of the first resistor, one end of the second resistor and one end of the third resistor;
the other end of the first resistor is connected with the negative input end of the fourth amplifier;
the other end of the second resistor is grounded;
the other end of the third resistor is connected with the output end of the fourth amplifier and used as the output end of the third filtering and amplifying circuit.
Further, an alarm explosion suppression unit is also included; the alarm explosion suppression unit comprises a state indicator lamp, a sound warning device and a fire extinguishing control circuit; the state indicator lamp, the sound warning device and the fire extinguishing control circuit are respectively electrically connected with the digital control unit and receive a control instruction of the digital control unit; the alarm explosion suppression unit is provided with a circuit interface connected with the fire extinguishing explosion suppression box, and the circuit interface is electrically connected with the output end of the fire extinguishing control circuit.
Further, the device also comprises a detection calibration unit, wherein the detection calibration unit comprises a temperature detection circuit; and the temperature detection circuit is electrically connected with the digital control unit.
Further, the detection calibration unit further comprises a voltage detection circuit; and the voltage detection circuit is electrically connected with the digital control unit.
Further, the semiconductor ultraviolet sensor comprises a sensor shell, a signal pin and an ultraviolet sensing chip; the sensor shell is cylindrical, the bottom of the sensor shell is a circular base, and the top of the sensor shell is a circular photosensitive glass window; the inner side of the round base is provided with the ultraviolet sensing chip, and the outer side of the round base is provided with the signal pin.
Furthermore, the diameter of the shell of the semiconductor ultraviolet sensor is 5-6 mm, and the height of the shell is 3-4 mm.
Furthermore, the anti-interference optical filter is attached to the outer portion of a light sensing window of the ultraviolet sensor, and the detection waveband of the ultraviolet sensor is limited to 200-290 nm.
Compared with the prior art, the utility model discloses one of following beneficial effect can be realized at least:
1. the utility model provides a compound anti-interference flame detector based on semiconductor ultraviolet sensor adopts the compound sensing mode of single ultraviolet sensor and two infrared sensor to detect flame radiation, has used filtering structure design filtering interference light at the ultraviolet sensor end, can effectively resist interference such as sunlight, camera flash light, has better perceptibility to flame characteristic radiation wave band, makes the system possess excellent interference killing feature and higher detection precision;
2. the utility model provides a pair of compound anti-interference flame detector based on semiconductor ultraviolet sensor has avoided using high-voltage power supply, can save high-voltage module circuit, has realized the miniaturization of detector, more has the security to can use in more extensive conflagration monitoring scene. Compared with the prior art, the flame detector has the advantages of safety, long service life and small volume.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
FIG. 1 is a block diagram of a flame detector system according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of an ultraviolet sensor according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first filter amplifier circuit and a second filter amplifier circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a third filter amplifying circuit according to an embodiment of the present invention;
fig. 5 is a front view of the structure diagram of the embodiment of the present invention;
fig. 6 is a schematic structural diagram top view according to an embodiment of the present invention.
Reference numerals:
1-ultraviolet sensing chip; 2-a circular base; 3-a sensor housing; 4-a circular photosensitive glass window; 5-a signal pin; 6-round anti-interference optical filter;
51-a main housing; 52-dorsal shell; 53-a gasket; 54-a hub; 56-screw hole; 57-top shell;
61-sensor window; 62-a sensor window; 63-sensor window; 64-indicator light window; 65-fixing hole.
Detailed Description
The present embodiment is described below with reference to the drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The utility model discloses a concrete embodiment, as shown in FIG. 1, discloses a compound flame detector based on semiconductor ultraviolet sensor, including first infrared sensing unit, second infrared sensing unit, semiconductor ultraviolet sensing unit, digital control unit, detection calibration unit, alarm explosion suppression unit, still include the power supply circuit that support circuit normally used in addition.
The first infrared sensing unit comprises a 2.75um waveband infrared sensor and a first filtering and amplifying circuit which are sequentially connected, and is used for monitoring infrared radiation of a 2.75um waveband in an environment and converting an optical signal of the waveband into a voltage signal;
the second infrared sensing unit comprises a 4.35um waveband infrared sensor and a second filtering and amplifying circuit which are sequentially connected, and is used for monitoring infrared radiation of a 4.35um waveband in an environment and converting an optical signal of the waveband into a voltage signal;
the semiconductor ultraviolet sensing unit comprises a semiconductor ultraviolet sensor and a third filtering and amplifying circuit which are sequentially connected, and is used for monitoring ultraviolet radiation in the environment and converting corresponding optical signals into voltage signals.
The semiconductor ultraviolet sensor structure is shown in fig. 2, and comprises a sensor shell 3, a signal pin 5 and an ultraviolet sensing chip 1; the sensor shell 3 is cylindrical, the bottom of the sensor shell is a circular base 2, and the top of the sensor shell is a circular photosensitive glass window 4; the inner side of the round base 2 is provided with an ultraviolet sensing chip 1, and the outer side of the round base 2 is provided with a signal pin 5.
Illustratively, the size of the sensor housing of the semiconductor ultraviolet sensor without pins is 5.5mm in diameter by 3.5mm in height, and the sensor housing is small in size. The ultraviolet sensing chip 1 has a wide detection ultraviolet spectrum range of 200-380 nm and a working temperature range of-25-120 ℃, and has strong adaptability to a detection environment.
A circular anti-interference optical filter 6 is attached to the outer portion of a light sensing window of the ultraviolet sensor, and the detection waveband of the ultraviolet sensor is limited to 200-290 nm, so that the ultraviolet waveband of ambient light such as sunlight is prevented from interfering the sensor, and the false alarm of fire is avoided.
And the output ends of the first filtering and amplifying circuit, the second filtering and amplifying circuit and the third filtering and amplifying circuit are respectively and electrically connected with the digital control unit.
The first filtering and amplifying circuit and the second filtering and amplifying circuit have the same circuit principle structure, the schematic circuit principle diagram is shown in fig. 3, the circuit mainly comprises a divider resistor, a potentiometer, a first amplifier, a second amplifier and a third amplifier, and the circuit has a filtering and amplifying function. One end of the divider resistor is electrically connected with the output end of the infrared sensor and the positive input end of the first amplifier, and the other end of the divider resistor is grounded; the negative input end and the output end of the first amplifier are connected with the positive input end of the second amplifier; the negative input end of the second amplifier is connected with one end of the potentiometer, the other end of the potentiometer is grounded, and the output end of the second amplifier is connected with the positive input end of the third amplifier; and the negative input end of the third amplifier is connected with the output end of the third amplifier and is used as the output end of the first filtering and amplifying circuit. When the infrared sensor is affected by flame radiation, the internal resistance of the sensor changes, voltage signals are obtained after voltage division through the voltage dividing resistors, the internal resistance of the sensor changes into circuit voltage changes after the voltage signals are processed by the filtering and amplifying circuit, and data acquisition is carried out by the digital control unit.
The schematic diagram of the third filtering and amplifying circuit is shown in fig. 4, and the circuit mainly comprises a fourth amplifier, a capacitor, a first resistor, a second resistor and a third resistor, and has the functions of filtering, amplifying and converting a sensor current signal into a voltage signal. The positive input end and the negative input end of the fourth amplifier are respectively connected with two signal ends of the ultraviolet sensor, the positive input end of the fourth amplifier is also grounded, and the negative input end of the fourth amplifier is also connected with one end of the capacitor; the other end of the capacitor is simultaneously connected with one end of the first resistor, one end of the second resistor and one end of the third resistor; the other end of the first resistor is connected with the negative input end of the fourth amplifier; the other end of the second resistor is grounded; the other end of the third resistor is connected with the output end of the fourth amplifier and used as the output end of the third filtering and amplifying circuit.
And the semiconductor ultraviolet sensor increases the photo-generated current under flame radiation, and the third filtering and amplifying circuit is adopted to convert the current signal into a voltage signal and output the voltage signal to the digital control unit for data acquisition.
The digital control unit is a core control part of the detector, collects and analyzes signals from the sensor unit and the detection calibration unit, is internally provided with the existing flame recognition algorithm, and can comprise threshold discrimination, characteristic frequency analysis and the like, so as to judge whether a fire exists and whether the system is in a normal operation state, and controls the alarm explosion suppression unit.
The alarm explosion suppression unit comprises a status indicator lamp, an acoustic warning device and a fire extinguishing control circuit. The status indicator lamp, the sound warning device and the fire extinguishing control circuit are respectively connected with the digital control unit and controlled by the digital control unit.
The state indicator lamp is used for indicating the fire condition and the system running state; the sound warning device is used for generating alarm sound when fire occurs, the environment temperature is overheated, and the system power supply voltage is insufficient.
Furthermore, the invention can be externally connected with a fire extinguishing explosion suppression box. The fire extinguishing control circuit is connected with an external fire extinguishing and explosion suppression box through a signal wire and outputs three paths of different voltage signals including a starting fire extinguishing signal, a state normal signal and a detector fault signal to the fire extinguishing and explosion suppression box. The fire extinguishing and explosion suppression box controls the fire extinguishing and explosion suppression bottle inside the fire extinguishing and explosion suppression box to start to spray the fire extinguishing agent after receiving the fire extinguishing starting signal, stops spraying the fire extinguishing agent after receiving the state normal signal, and generates a fault maintenance prompt after receiving the fault signal of the detector.
The detection calibration unit comprises a temperature detection circuit and a voltage detection circuit. The temperature detection circuit is electrically connected with the digital control unit and is used for sensing the ambient temperature; and the voltage detection circuit is electrically connected with the digital control unit and is used for detecting the power supply voltage of the detector.
Preferably, the composite flame detector based on the semiconductor ultraviolet sensor further comprises a shell, and the first infrared sensing unit, the second infrared sensing unit, the semiconductor ultraviolet sensing unit, the digital control unit, the detection calibration unit and the alarm explosion suppression unit are respectively arranged in the shell. As shown in fig. 5, the housing is a housing structure composed of a main housing 51, a back housing 52, an interface seat 54, and a top housing 57. Wherein, between the main shell 51 and the back shell 52, sealed by a sealing gasket 53; an interface seat 54 is arranged on one side of the main shell 51; the interface seat 54 has a wiring hole 55 in the middle; four identical screw holes 56 are evenly distributed around the wiring hole 55, a wiring pipe connector is fixed through the screw holes, and a power supply line and a signal line in the wiring pipe are connected with an internal circuit of the flame detector through the wiring hole 55; the top shell 57 is a detection surface, and specifically as shown in fig. 6, three sensor windows 61, 62, 63 and an indicator light window 64 are distributed in the middle of the detection surface, and the first infrared sensor, the second infrared sensor and the ultraviolet sensor are respectively close to one sensor window so as to facilitate detection; two identical fixing holes 65 are respectively arranged on two sides of the detection surface, and the flame detector is fixed on a wall or other objects through the two fixing holes.
The working process comprises the following steps:
the first step is as follows: in the process of starting up initialization, the detection and calibration unit converts the ambient temperature sensor signal and the circuit voltage detection signal into voltage signals, and the digital control unit performs acquisition and calibration to enable the system to enter a normal working state.
The second step is that: in a normal state, the first infrared sensing unit converts an optical signal into a voltage signal through the first filtering and amplifying circuit, the second infrared sensing unit converts the optical signal into the voltage signal through the second filtering and amplifying circuit, the semiconductor ultraviolet sensing unit converts the optical signal into the voltage signal through the third filtering and amplifying circuit, and the detection and calibration unit converts an ambient temperature sensor signal and a circuit voltage detection signal into the voltage signal; the voltage signals are respectively collected, processed and analyzed by the digital control unit.
The third step: when the voltage signal of the sensor collected by the digital control unit changes compared with the normal state, the digital control unit judges whether the flame is detected by algorithms such as built-in threshold discrimination, characteristic frequency analysis and the like.
If the digital control unit judges that the fire occurs, the alarm explosion suppression unit controls the indicator lamp and the sound warning device to send out alarm signals and sends fire extinguishing starting signals to the fire extinguishing control circuit. If the flame detector is connected with the fire extinguishing explosion suppression box, the fire extinguishing explosion suppression box controls the fire extinguishing explosion suppression bottle inside the fire extinguishing explosion suppression box to start to spray extinguishing agent after receiving a fire extinguishing starting signal;
if the digital control unit judges that the fire does not occur, the alarm explosion suppression unit is not started;
and if the digital control unit judges that the fire disappears after the fire occurs, the alarm explosion suppression unit is set to recover to a normal state.
The fourth step: in the operation process of the composite anti-interference flame detector of the semiconductor ultraviolet sensor, if the digital control unit judges that the detector has abnormal conditions, such as insufficient voltage, overhigh environment temperature and the like, the alarm explosion suppression unit controls the indicator lamp and the sound warning device to send out alarm signals and sends detector fault signals to the fire extinguishing control circuit. At the moment, if the flame detector is connected with the fire extinguishing explosion suppression box, the fire extinguishing explosion suppression box generates a fault maintenance prompt after receiving the detector fault signal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. The utility model provides a compound anti-interference flame detector based on semiconductor ultraviolet sensor which characterized in that: the infrared sensor comprises a first infrared sensing unit, a second infrared sensing unit, a semiconductor ultraviolet sensing unit and a digital control unit; wherein the content of the first and second substances,
the first infrared sensing unit comprises a 2.75um waveband infrared sensor and a first filtering and amplifying circuit which are sequentially connected;
the second infrared sensing unit comprises a 4.35um waveband infrared sensor and a second filtering and amplifying circuit which are sequentially connected;
the semiconductor ultraviolet sensing unit comprises a semiconductor ultraviolet sensor and a third filtering and amplifying circuit which are sequentially connected; an anti-interference optical filter is arranged outside a photosensitive window of the semiconductor ultraviolet sensor;
and the output ends of the first filtering and amplifying circuit, the second filtering and amplifying circuit and the third filtering and amplifying circuit are respectively and electrically connected with the digital control unit.
2. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 1, wherein: the first filtering amplification circuit comprises a divider resistor, a potentiometer, a first amplifier, a second amplifier and a third amplifier; wherein the content of the first and second substances,
one end of the divider resistor is electrically connected with the output end of the infrared sensor and the positive input end of the first amplifier, and the other end of the divider resistor is grounded;
the negative input end and the output end of the first amplifier are both connected with the positive input end of the second amplifier;
the negative input end of the second amplifier is connected with one end of the potentiometer, the other end of the potentiometer is grounded, and the output end of the second amplifier is connected with the positive input end of the third amplifier;
and the negative input end of the third amplifier is connected with the output end of the third amplifier and is used as the output end of the first filtering and amplifying circuit.
3. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 1, wherein: the second filtering and amplifying circuit and the first filtering and amplifying circuit have the same circuit structure.
4. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 1, wherein: the third filtering and amplifying circuit comprises a fourth amplifier, a capacitor, a first resistor, a second resistor and a third resistor; wherein the content of the first and second substances,
the positive input end and the negative input end of the fourth amplifier are respectively connected with two signal ends of the ultraviolet sensor, the positive input end of the fourth amplifier is also grounded, and the negative input end of the fourth amplifier is also connected with one end of the capacitor;
the other end of the capacitor is simultaneously connected with one end of the first resistor, one end of the second resistor and one end of the third resistor;
the other end of the first resistor is connected with the negative input end of the fourth amplifier;
the other end of the second resistor is grounded;
the other end of the third resistor is connected with the output end of the fourth amplifier and used as the output end of the third filtering and amplifying circuit.
5. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 1, wherein: the device also comprises an alarm explosion suppression unit; the alarm explosion suppression unit comprises a state indicator lamp, a sound warning device and a fire extinguishing control circuit; the state indicator lamp, the sound warning device and the fire extinguishing control circuit are respectively electrically connected with the digital control unit and receive a control instruction of the digital control unit; the alarm explosion suppression unit is provided with a circuit interface connected with the fire extinguishing explosion suppression box, and the circuit interface is electrically connected with the output end of the fire extinguishing control circuit.
6. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 1, wherein: the device also comprises a detection calibration unit, wherein the detection calibration unit comprises a temperature detection circuit; and the temperature detection circuit is electrically connected with the digital control unit.
7. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 6, wherein: the detection calibration unit also comprises a voltage detection circuit; and the voltage detection circuit is electrically connected with the digital control unit.
8. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in any one of claims 1 to 4, wherein: the semiconductor ultraviolet sensor comprises a sensor shell, a signal pin and an ultraviolet sensing chip; the sensor shell is cylindrical, the bottom of the sensor shell is a circular base, and the top of the sensor shell is a circular photosensitive glass window; the inner side of the round base is provided with the ultraviolet sensing chip, and the outer side of the round base is provided with the signal pin.
9. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 8, wherein: the diameter of the semiconductor ultraviolet sensor shell is 5-6 mm, and the height of the shell is 3-4 mm.
10. The composite anti-interference flame detector based on the semiconductor ultraviolet sensor as claimed in claim 9, wherein: an anti-interference optical filter is attached to the outer portion of a light sensing window of the ultraviolet sensor, and the detection wave band of the ultraviolet sensor is limited to 200-290 nm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023022299.0U CN213935142U (en) | 2020-12-15 | 2020-12-15 | Compound anti-interference flame detector based on semiconductor ultraviolet sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023022299.0U CN213935142U (en) | 2020-12-15 | 2020-12-15 | Compound anti-interference flame detector based on semiconductor ultraviolet sensor |
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| CN213935142U true CN213935142U (en) | 2021-08-10 |
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| CN202023022299.0U Expired - Fee Related CN213935142U (en) | 2020-12-15 | 2020-12-15 | Compound anti-interference flame detector based on semiconductor ultraviolet sensor |
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