Large Field-of-View High-Sensitivity Flame Detector and Detection Method Based on Vanadium Oxide Array

Abstract

This invention provides a large field-of-view, high-sensitivity flame detector and detection method based on a vanadium oxide array, comprising: a lens assembly, an electrochromic thin film, a vanadium oxide area array sensor, a signal amplification circuit, a first processor, a data receiver, a first LDO voltage regulator circuit, a voltage reference circuit, an EEPROM storage circuit, an LED display module, a temperature sensor, a reset circuit, a second processor, a CAN communication module, an alarm output circuit, a DC / DC power supply circuit, a second LDO voltage regulator circuit, and a data management terminal. This invention utilizes a fisheye lens assembly as a front-facing focusing unit, employs a vanadium oxide area array sensor as the light-detecting element, and combines it with a high-performance second processor to achieve data processing of multi-channel array signals, thereby enabling rapid flame identification. Compared to traditional infrared flame detectors, it offers advantages such as strong anti-interference capability, a large detection field of view, and high sensitivity.

Description

Technical Field

[0001] This invention relates to the field of flame detection technology, and more specifically, to a large field-of-view, high-sensitivity flame detector and detection method based on a vanadium oxide array. Background Technology

[0002] For some special vehicles and equipment, fires often break out during training and combat due to attacks or short circuits caused by aging internal wiring. If not intervened immediately, this can result in damage to personnel and vehicles. Therefore, special vehicles and equipment are often equipped with a varying number of optical flame detectors in conjunction with a host computer to enable rapid detection and extinguishing of flames.

[0003] Existing optical flame detectors from the 1970s mostly used single-band or dual-band infrared flame detectors, but their poor anti-interference capabilities, high false alarm rate, and short detection range limited their applications. Currently, common optical flame detectors employ a combined violet-infrared flame detection method.

[0004] In the control system and method for an infrared ultraviolet flame detector in patent CN 107170173A, a vacuum ultraviolet tube is used as the main device for detecting flames. It primarily identifies flames by determining whether the accumulated number of ultraviolet pulses over a period of time exceeds a threshold. Infrared and ultraviolet flame detectors often employ multiple detection bands and various types of sensors, resulting in high costs. Furthermore, vacuum ultraviolet tubes are fragile, have relatively short lifespans, and are prone to self-excitation, leading to a high false alarm rate under sunlight. Additionally, current optical flame detectors typically have a field of view of only 90°, creating blind spots and potential for missed detections. Therefore, a large field of view, high reliability, and low cost optical flame detector is needed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a large field-of-view, high-sensitivity flame detector and detection method based on a vanadium oxide array.

[0006] According to the present invention, a large field-of-view, high-sensitivity flame detector based on a vanadium oxide array includes: a lens assembly, an electrochromic thin film, a vanadium oxide array sensor, a signal amplification circuit, a first processor, a data receiver, a first LDO voltage regulator circuit, a voltage reference circuit, an EEPROM storage circuit, an LED display module, a temperature sensor, a reset circuit, a second processor, a CAN communication module, an alarm output circuit, a DC / DC power supply circuit, a second LDO voltage regulator circuit, and a data management terminal.

[0007] The electrochromic film is deposited on the lens assembly; the area array vanadium oxide sensor is connected to the electrochromic film; the signal amplification circuit is connected to the area array vanadium oxide sensor; the first processor is connected to both the signal amplification circuit and the electrochromic film; the data receiver is connected to the first processor.

[0008] The first LDO voltage regulator circuit is connected to the electrochromic thin film, the vanadium oxide array sensor, the signal amplification circuit, the first processor, and the data receiver, respectively.

[0009] The second processor is connected to the data receiver, the voltage reference circuit, the EEPROM storage circuit, the LED display module, the temperature sensor, and the reset circuit, respectively.

[0010] The CAN communication module is connected to the second processor and the data management terminal respectively;

[0011] The alarm output circuit is connected to the second processor and the data management terminal respectively;

[0012] The DC / DC power supply circuit and the second LDO voltage regulator circuit provide power to the flame detector.

[0013] Preferably, the lens assembly receives external light, filters out stray light through the electrochromic film, and then focuses it onto the photosensitive plane of the vanadium oxide array sensor.

[0014] The lens assembly is a fisheye lens;

[0015] The electrochromic film selects a preset center wavelength for detecting flame signals;

[0016] The vanadium oxide array sensor converts optical signals into electrical signals.

[0017] Preferably, the signal amplification circuit is used to amplify the electrical signal generated by the area array vanadium oxide sensor;

[0018] The first processor is used to receive the signal processed by the signal amplification circuit, and at the same time control the opening and closing of the electrochromic film through PWM;

[0019] The data receiver is used to receive data sent by the first processor.

[0020] Preferably, the first LDO voltage regulator circuit supplies power to the electrochromic thin film, the vanadium oxide array sensor, the signal amplification circuit, the first processor, and the data receiver.

[0021] Preferably, the second processor receives the data transmitted by the data receiver and monitors the detector temperature in real time. When the temperature is high and meets the preset requirements, or when the temperature is low and meets the preset requirements, the processor performs temperature compensation on the response of the vanadium oxide array sensor to ensure that the flame detector works normally.

[0022] Preferably, the voltage reference circuit is used as a reference voltage source;

[0023] The EEPROM storage circuit is used to store the data received by the second processor;

[0024] The LED display module is used to display the status of the flame detector;

[0025] The temperature sensor is used to collect the ambient temperature of the flame detector; when the current ambient temperature is higher or lower than a preset value, the second processor compensates the vanadium oxide array sensor.

[0026] The reset circuit is used to ensure the operational stability of the second processor.

[0027] Preferably, the DC / DC power supply circuit is used for voltage reduction;

[0028] The second LDO voltage regulator circuit supplies power to the voltage reference circuit, the second processor, the EEPROM storage circuit, the LED display module, the temperature sensor, the reset circuit, the CAN communication module, and the alarm output circuit.

[0029] Preferably, the second processor issues CANRX / CANTX commands to enable the CAN communication module to work normally and interact with the data management terminal;

[0030] The second processor sends an alarm signal and outputs a fire alarm signal C_OUT_HJ to the data management terminal through the alarm output circuit.

[0031] According to the detection method of a large field-of-view, high-sensitivity flame detector based on a vanadium oxide array provided by the present invention, the following steps are achieved using the aforementioned large field-of-view, high-sensitivity flame detector based on a vanadium oxide array:

[0032] Step S1: When there is a flame in the space where the flame detector is located, the light passes through the lens assembly, through the electrochromic film and is focused onto the vanadium oxide array sensor. After passing through the signal amplification circuit, the first processor processes the collected signal.

[0033] Step S2: While acquiring the signal, the ambient temperature is monitored in real time using the temperature sensor. If the temperature is too high and meets the preset requirements, or if the temperature is too low and meets the preset requirements, temperature compensation is performed on the signal acquired by the vanadium oxide array sensor.

[0034] Step S3: The 16 signals generated by the vanadium oxide array sensor are transmitted to the second processor through the data receiver. The second processor uses Fast Fourier Transform to calculate the frequency of the 16 signals and extracts the peak value of the signal intensity. The set threshold is compared with the peak value of each channel to identify whether there is a flame.

[0035] Preferably, step S3 involves the following steps: if a flame is detected, the second processor will issue a fire alarm signal and simultaneously control the red LED to issue an alarm reminder. The fire alarm signal is then output as an alarm signal C_OUT_HJ to the host computer via the alarm output circuit for the host computer to make a decision.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The detector of this invention uses a fisheye lens, which can greatly improve the detection field of view and improve detection efficiency;

[0038] 2. This invention innovatively uses an electrochromic film as a filter device, and the color change of the electrochromic film can be controlled by a first processor, overcoming the shortcomings of traditional infrared film coating, such as low reliability, easy failure, and high cost.

[0039] 3. This invention utilizes a temperature sensor with temperature compensation to solve the problem of low response of infrared sensors under high and low temperature conditions, enabling the flame detector to operate in a wider range of ambient temperatures.

[0040] 4. This invention uses a multi-array infrared vanadium oxide detection element as the detection element, which can realize flame identification and elimination of false alarm sources by comparing information between each pixel element, thereby improving anti-interference capability. Attached Figure Description

[0041] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0042] Figure 1 This is a system block diagram of a large field-of-view, high-sensitivity flame detector based on a vanadium oxide array, provided for an embodiment of the present invention. Detailed Implementation

[0043] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0044] Example 1

[0045] According to the present invention, a large field-of-view, high-sensitivity flame detector based on a vanadium oxide array is provided, such as... Figure 1 As shown, it includes:

[0046] The system includes a lens assembly, an electrochromic thin film, a vanadium oxide array sensor, a signal amplification circuit, a first processor, a data receiver, an LDO voltage regulator circuit 1, a voltage reference circuit, an EEPROM storage circuit, an LED display module, a temperature sensor, a reset circuit, a second processor, a CAN communication module, an alarm output circuit, a DC / DC power supply circuit, an LDO voltage regulator circuit 2, and a data management terminal.

[0047] The lens assembly mainly receives external light and focuses it onto the photosensitive plane of the vanadium oxide array sensor.

[0048] The electrochromic film is deposited on the lens assembly to filter out stray light;

[0049] In this embodiment, the lens assembly is a fisheye lens. The electrochromic film is selected with a center wavelength of 4.3 μm for detecting flame signals.

[0050] The vanadium oxide array sensor is connected to the electrochromic film to receive external light and convert the light signal into an electrical signal.

[0051] In this embodiment, the vanadium oxide area sensor uses a 4×4 array.

[0052] The signal amplification circuit is connected to the vanadium oxide array sensor and is used to amplify the electrical signal generated by the vanadium oxide array sensor.

[0053] The first processor is connected to the signal amplification circuit and the electrochromic film. It is used to receive the signal processed by the signal amplification circuit and control the electrochromic film to turn on and off via PWM.

[0054] The data receiver is connected to the first processor and is used to receive data sent by the first processor;

[0055] LDO voltage regulator circuit 1 is connected to the electrochromic thin film, the vanadium oxide array sensor, the signal amplification circuit, the first processor and the data receiver, and is used to supply power to the above components.

[0056] The second processor is connected to a data receiver, a voltage reference circuit, an EEPROM storage circuit, an LED display module, a temperature sensor, and a reset circuit. It is used to process the data sent by the first processor in real time, monitor the detector temperature in real time, use an algorithm to compensate for the temperature of the data when the temperature is high, and make a comprehensive judgment on the flame. In this embodiment, the second processor uses an FPGA to enhance the processing speed and processing capability.

[0057] The voltage reference circuit is connected to the second processor and serves as a reference voltage source. The voltage reference circuit is based on a voltage reference chip and detects voltage changes in the processor to prevent damage from overvoltage and undervoltage, thereby improving the sampling accuracy of the second processor.

[0058] The EEPROM storage circuit is connected to the second processor and is used to store the data received by the second processor;

[0059] The LED display module is connected to the second processor and is used to display the status of the detector.

[0060] In this embodiment, the LED display module includes two LEDs: a red LED serves as an alarm indicator for a fire, and a green LED serves as an indicator for the detector to be working properly.

[0061] The temperature sensor is connected to the second processor and is used to collect the ambient temperature of the detector, providing a reference for the algorithm compensation of the second processor.

[0062] In this embodiment, the temperature sensor monitors the real-time temperature of the flame detector. When the temperature is high, the response of the vanadium oxide sensor will decrease. At this time, the second processor will compensate for the response of the vanadium oxide sensor during data processing to ensure that the flame detector can work normally under high and low temperature conditions.

[0063] The reset circuit is connected to the second processor to ensure the operational stability of the second processor;

[0064] The CAN communication module is connected to the second processor and the host computer. The second processor issues CANRX / CANTX commands to enable the CAN communication module to work normally and interact with the host computer.

[0065] The alarm output circuit is connected to the second processor and the host computer. The second processor sends an alarm signal through data processing and outputs a fire alarm signal C_OUT_HJ to the host computer through the alarm output circuit for the host computer to make a decision.

[0066] The power supply circuit includes a DC / DC power supply circuit and an LDO voltage regulator circuit 2, which supply power to the detector system after voltage conversion.

[0067] In this embodiment, the power supply circuit includes a DC / DC power supply circuit, an LDO voltage regulator circuit 1, and an LDO voltage regulator circuit 2. The DC / DC step-down module converts 24V to 5V, the LDO voltage regulator circuit 2 regulates 5V to 3.3V, and the LDO voltage regulator circuit 1 regulates 24V to 5V.

[0068] The 3.3V output from the LDO voltage regulator circuit 2 supplies power to the voltage reference circuit, the second processor, the EEPROM, the LED, the temperature sensor, the reset circuit, the CAN communication module, and the alarm output circuit.

[0069] Furthermore, the 5V voltage output by the LDO voltage regulator circuit 1 supplies power to the electrochromic thin film, the vanadium oxide array sensor, the signal amplification circuit, the first processor, and the data receiver.

[0070] Example 2

[0071] Example 2 is a preferred example of Example 1.

[0072] According to the present invention, a detection method for a large field-of-view, high-sensitivity flame detector based on a vanadium oxide array is provided, which utilizes the aforementioned large field-of-view, high-sensitivity flame detector based on a vanadium oxide array to achieve the following steps:

[0073] When a flame is present in the space where the flame detector is located, light passes through the lens assembly and the electrochromic film, focusing onto the vanadium oxide sensor array. After passing through the signal amplification circuit, the first processor processes the acquired signal.

[0074] While acquiring signals, the temperature sensor monitors the ambient temperature in real time. If the temperature is too high or too low, temperature compensation is required for the signal acquired by the vanadium oxide sensor. When the temperature is too high, the sensor response decreases, and the threshold for flame detection needs to be lowered. After actual measurement, the relationship between temperature and threshold can be obtained. Therefore, different thresholds can be set in the algorithm according to different temperatures, which is to perform compensation.

[0075] Sixteen signals are transmitted to a second processor via a data receiver. The second processor uses a Fast Fourier Transform (FFT) to calculate the frequency of the sixteen signals and extract the peak signal intensity. By setting a threshold and comparing it with the peak values ​​of each of the sixteen channels, the presence of a flame can be identified. Specifically, the threshold X is pre-set in the software. The software calculates the peak signal intensity Y; if Y > X, it determines that there is a fire.

[0076] If a flame is detected, the second processor will issue a fire alarm signal and simultaneously control the red LED to issue an alarm reminder. The fire alarm signal is then transmitted through the alarm output circuit to the host computer as an alarm signal C_OUT_HJ, which is then used by the host computer for decision-making. This completes the entire flame detection process.

[0077] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0078] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A large field-of-view, high-sensitivity flame detector based on a vanadium oxide array, characterized in that, include: Lens assembly, electrochromic film, vanadium oxide array sensor, signal amplification circuit, first processor, data receiver, first LDO voltage regulator circuit, voltage reference circuit, EEPROM storage circuit, LED display module, temperature sensor, reset circuit, second processor, CAN communication module, alarm output circuit, DC / DC power supply circuit, second LDO voltage regulator circuit and data management terminal; The electrochromic film is deposited on the lens assembly; the lens assembly receives external light, filters out stray light through the electrochromic film, and focuses it onto the photosensitive plane of the vanadium oxide area array sensor; the signal amplification circuit is connected to the vanadium oxide area array sensor; the first processor is connected to both the signal amplification circuit and the electrochromic film; the data receiver is connected to the first processor. The first LDO voltage regulator circuit is connected to the electrochromic thin film, the vanadium oxide array sensor, the signal amplification circuit, the first processor, and the data receiver, respectively. The second processor is connected to the data receiver, the voltage reference circuit, the EEPROM storage circuit, the LED display module, the temperature sensor, and the reset circuit, respectively. The CAN communication module is connected to the second processor and the data management terminal respectively; The alarm output circuit is connected to the second processor and the data management terminal respectively; The DC / DC power supply circuit and the second LDO voltage regulator circuit provide power to the flame detector; The lens assembly is a fisheye lens.

2. The large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 1, characterized in that, The electrochromic film selects a preset center wavelength for detecting flame signals; The vanadium oxide array sensor converts optical signals into electrical signals.

3. The large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 1, characterized in that, The signal amplification circuit is used to amplify the electrical signal generated by the vanadium oxide array sensor. The first processor is used to receive the signal processed by the signal amplification circuit, and at the same time control the opening and closing of the electrochromic film through PWM; The data receiver is used to receive data sent by the first processor.

4. The large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 1, characterized in that, The first LDO voltage regulator circuit supplies power to the electrochromic thin film, the vanadium oxide array sensor, the signal amplification circuit, the first processor, and the data receiver.

5. The large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 1, characterized in that, The second processor receives the data transmitted by the data receiver and monitors the detector temperature in real time. When the temperature is high and meets the preset requirements, or low and meets the preset requirements, the processor performs temperature compensation on the response of the vanadium oxide array sensor to ensure that the flame detector works normally.

6. The large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 1, characterized in that, The voltage reference circuit is used as a reference voltage source; The EEPROM storage circuit is used to store the data received by the second processor; The LED display module is used to display the status of the flame detector; The temperature sensor is used to collect the ambient temperature of the flame detector; when the current ambient temperature is higher or lower than a preset value, the second processor compensates the vanadium oxide array sensor. The reset circuit is used to ensure the operational stability of the second processor.

7. The large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 1, characterized in that, The DC / DC power supply circuit is used for voltage reduction; The second LDO voltage regulator circuit supplies power to the voltage reference circuit, the second processor, the EEPROM storage circuit, the LED display module, the temperature sensor, the reset circuit, the CAN communication module, and the alarm output circuit.

8. The large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 1, characterized in that, The second processor issues CANRX / CANTX commands to enable the CAN communication module to work normally and interact with the data management terminal. The second processor sends an alarm signal and outputs a fire alarm signal C_OUT_HJ to the data management terminal through the alarm output circuit.

9. A detection method for a large field-of-view, high-sensitivity flame detector based on a vanadium oxide array, characterized in that, The following steps are achieved using the large field-of-view, high-sensitivity flame detector based on a vanadium oxide array as described in any one of claims 1 to 8: Step S1: When there is a flame in the space where the flame detector is located, the light passes through the lens assembly, through the electrochromic film and is focused onto the vanadium oxide array sensor. After passing through the signal amplification circuit, the first processor processes the collected signal. Step S2: While acquiring the signal, the ambient temperature is monitored in real time using the temperature sensor. If the temperature is too high and meets the preset requirements, or if the temperature is too low and meets the preset requirements, temperature compensation is performed on the signal acquired by the vanadium oxide array sensor. Step S3: The 16 signals generated by the vanadium oxide array sensor are transmitted to the second processor through the data receiver. The second processor uses Fast Fourier Transform to calculate the frequency of the 16 signals and extracts the peak value of the signal intensity. The set threshold is compared with the peak value of each channel to identify whether there is a flame.

10. The detection method of the large field-of-view, high-sensitivity flame detector based on a vanadium oxide array according to claim 9, characterized in that, Step S3 involves the following steps: If a flame is detected, the second processor will issue a fire alarm signal and simultaneously control the red LED to issue an alarm reminder. The fire alarm signal will then be output as an alarm signal C_OUT_HJ to the host computer via the alarm output circuit for the host computer to make a decision.

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