Light intensity adjusting control module based on distributed optical fiber fire detector

Abstract

The utility model discloses a light intensity regulation control module based on a distributed optical fiber fire detector, which relates to the field of distributed optical fiber fire detectors and light intensity regulation, and comprises a DFB (Distributed Feedback) laser, a signal sampling circuit, a control circuit and a light power supplement circuit, current signals passing through the DFB laser are input to the signal acquisition circuit for analog-to-digital conversion, digital signals are processed through the control circuit, corresponding control signals are generated and used for controlling the work of the optical power supplement circuit, and the optical power supplement circuit can amplify the light intensity of optical signals emitted by the DFB laser, so that long-distance detection can be realized; and the optical power supplement circuit can perform corresponding optical power supplement when the optical power of the DFB laser is reduced, so that the detection stability of the DFB laser is improved.

Description

Technical Field

[0001] The utility model relates to the field of distributed optical fiber fire detectors and light intensity regulation, in particular to a light intensity regulation control module based on the distributed optical fiber fire detector. Background Art

[0002] Distributed fiber optic fire detectors are fire warning systems that use the temperature-sensitive properties of optical fibers to monitor temperature changes along the fiber in real time. Simply put, a special optical fiber is laid in the area that needs to be monitored. When the temperature in the area changes, the optical properties of the fiber will also change, so that these changes can be detected to determine whether there is a fire hazard. The light source used by distributed fiber optic fire detectors is a DFB laser, but because the light intensity of the DFB laser is not strong enough, long-distance detection cannot be achieved.

[0003] Moreover, when the operating temperature of the distributed optical fiber fire detector changes, the output optical power of the DFB laser will also change, which will affect the detection stability of the distributed optical fiber fire detector. When the temperature of the laser rises, the output optical power of the DFB laser will decrease. The DFB laser will also generate heat during use, and long-term operation will also cause the output optical power to decrease. The decrease in the output optical power of the DFB laser will cause the distributed optical fiber fire detector to reduce or fail the temperature detection performance, affecting the detection stability.

[0004] Therefore, there is a need to provide a light intensity regulation control module based on a distributed optical fiber fire detector that can achieve long-distance detection and improve detection stability. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the utility model provides a light intensity regulation control module based on a distributed optical fiber fire detector, which solves the problem that the current distributed optical fiber fire detector cannot realize long-distance detection and has low detection stability.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a light intensity regulation control module based on a distributed optical fiber fire detector, which includes a DFB laser, a signal sampling circuit, a control circuit and an optical power supplement circuit.

[0007] The current signal input end of the signal sampling circuit is electrically connected to the current signal output end of the DFB laser; the signal sampling circuit converts the input current signal into a digital signal and outputs it through the digital signal output end.

[0008] The digital signal input end of the control circuit is electrically connected to the digital signal output end of the signal sampling circuit; the control signal output end of the control circuit is electrically connected to the control signal input end of the optical power supplement circuit, and the optical power supplement circuit receives the control signal and outputs an optical signal at its output end.

[0009] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in a possible design, the signal sampling circuit includes an amplifier circuit and an acquisition circuit, the input end of the amplifier circuit is electrically connected to the current signal output end of the DFB laser as a current signal input end, and the voltage analog signal output end of the amplifier circuit is electrically connected to the voltage analog signal input end of the acquisition circuit, and is used to convert the input current signal into a voltage analog signal and output it to the acquisition circuit.

[0010] The acquisition circuit converts the input voltage analog signal into a digital signal, and the output end of the acquisition circuit serves as a digital signal output end and is electrically connected to the digital signal input end of the control circuit.

[0011] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in a possible design, the amplification circuit includes a transimpedance amplifier circuit and an operational amplifier circuit.

[0012] The input end of the transimpedance amplifier circuit is electrically connected to the current signal output end of the DFB laser as a current signal input end, and the voltage signal output end of the transimpedance amplifier circuit is electrically connected to the voltage signal input end of the operational amplifier circuit, for converting the input current signal into an amplified voltage signal and outputting it to the operational amplifier circuit.

[0013] The output end of the operational amplifier circuit is electrically connected to the voltage analog signal input end of the acquisition circuit as a voltage analog signal output end, and is used to perform secondary amplification on the input voltage signal to form a voltage analog signal, and output it to the acquisition circuit.

[0014] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in a possible design, the acquisition circuit includes an ADC analog-to-digital converter, and the input end of the ADC analog-to-digital converter is electrically connected to the voltage analog signal output end of the amplifier circuit as a voltage analog signal input end; the output end of the ADC analog-to-digital converter is electrically connected to the digital signal input end of the control circuit as a digital signal output end, and the ADC analog-to-digital converter converts the input voltage analog signal into a corresponding digital signal, and outputs the digital signal to the control circuit through the digital signal output end.

[0015] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in a possible design, the control circuit includes an FPGA chip, the input end of the FPGA chip is electrically connected to the digital signal output end of the signal sampling circuit as a digital signal input end, and the output end of the FPGA chip is electrically connected to the signal input end of the optical power supplement circuit.

[0016] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in a possible design, the FPGA chip adopts FPGA-XQ7A100T.

[0017] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in one possible design, the optical power supplement circuit includes a pump laser, the input end of the pump laser is electrically connected to the control signal output end of the control circuit, and the output end of the pump laser outputs an optical signal.

[0018] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in a possible design, it also includes a DFB laser fault alarm circuit, and the fault alarm signal input end of the DFB laser fault alarm circuit is electrically connected to the fault alarm signal output end of the control circuit.

[0019] Based on the above-mentioned light intensity regulation control module based on distributed optical fiber fire detector, in a possible design, the DFB laser fault alarm circuit includes a transistor and an LED light source, the collector of the transistor is set as the fault alarm signal input end of the DFB laser fault alarm circuit, the emitter of the transistor is electrically connected to the LED light source, and the base of the transistor is grounded.

[0020] Beneficial effects:

[0021] The utility model discloses a light intensity regulation control module based on a distributed optical fiber fire detector, comprising a DFB laser, a signal sampling circuit, a control circuit and an optical power supplement circuit. The DFB laser emits an optical signal for detection, and a current signal passing through the DFB laser is input into a signal adopting circuit for analog-to-digital conversion. The digital signal is then processed by the control circuit to generate a corresponding control signal for controlling the operation of the optical power supplement circuit. The optical power supplement circuit can amplify the light intensity of the optical signal emitted by the DFB laser, so that long-distance detection can be achieved; and the optical power supplement circuit can perform corresponding optical power supplement when the optical power of the DFB laser decreases, so that the detection stability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A functional structural block diagram of a light intensity regulation control module based on a distributed optical fiber fire detector provided by the utility model;

[0024] Figure 2 This is a functional structural block diagram of a light intensity regulation control module based on a distributed optical fiber fire detector in Example 2 of the utility model. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0026] It should be understood that although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, a first unit can be referred to as a second unit, and similarly, a second unit can be referred to as a first unit without departing from the scope of embodiments of the present invention.

[0027] In the following description, certain details are provided to facilitate a complete understanding of the example embodiments. However, it will be appreciated by those of ordinary skill in the art that the example embodiments may be implemented without these certain details. For example, the system may be shown in a block diagram to avoid obscuring the example with unnecessary details. In other embodiments, well-known processes, structures, and techniques may not be shown in unnecessary detail to avoid obscuring the embodiments.

[0028] Embodiment 1:

[0029] like Figure 1As shown, this embodiment provides a light intensity regulation control module based on a distributed optical fiber fire detector, including a DFB laser, an amplification circuit, an acquisition circuit, a control circuit and an optical power supplement circuit; the DFB laser (Distributed Feedback Laser) is a distributed feedback laser, which has a built-in Bragg grating and is a side-emitting semiconductor laser. In the light intensity regulation control module provided in this embodiment, the DFB laser is used as a seed laser source to emit an optical signal for detection work, providing a laser with high stability and high monochromaticity for the detection work.

[0030] When performing detection work, the DFB laser starts and emits a light signal. The current signal output end of the DFB laser outputs a current signal. The signal sampling circuit receives this current signal through the current signal input end and completes the conversion of the current signal into a digital signal to facilitate subsequent information analysis and processing.

[0031] The signal sampling circuit outputs the digital signal through the digital signal output terminal, and the control circuit receives the digital signal through the digital signal input terminal. The control circuit can analyze the input digital signal to obtain the optical power information of the DFB laser, and generate a corresponding control signal based on the analyzed optical power information to control the operation of the optical power supplement circuit.

[0032] The control circuit outputs the control signal through the control signal output terminal, and the optical power supplement circuit receives the control signal through the control signal input terminal and outputs the optical signal. The control mode is: when the optical power information of the DFB laser obtained by the control circuit analysis is normal and long-distance detection is not performed, the control signal is output to control the optical power supplement circuit not to work; when the optical power information of the DFB laser obtained by the control circuit analysis is normal and long-distance detection is performed, the control signal is output to control the optical power supplement circuit to work, and provide light intensity amplification for the DFB laser, making up for the defect of insufficient light intensity of the DFB laser, so that it can achieve long-distance detection; when the optical power information of the DFB laser obtained by the control circuit analysis shows that the optical power of the DFB laser decreases, the control signal is output to control the optical power supplement circuit to work, and provide optical power supplement for the DFB laser to ensure higher detection stability.

[0033] Embodiment 2:

[0034] like Figure 2As shown, the present embodiment provides a light intensity regulation control module based on a distributed optical fiber fire detector. As a preferred implementation, the signal sampling circuit includes an amplification circuit and an acquisition circuit. The amplification circuit includes a transimpedance amplifier circuit and an operational amplifier circuit. The transimpedance amplifier circuit is used to convert the input current signal into a voltage signal and perform a signal amplification process; the amplified voltage signal is input into the operational amplifier circuit, and the operational amplifier circuit performs a secondary signal amplification process on the input voltage signal, thereby obtaining a voltage analog signal and outputting it to the acquisition circuit; the current signal output after passing through the DFB laser is a weak, unstable small current signal, which cannot be directly acquired. The transimpedance amplifier circuit and the operational amplifier circuit are to solve this problem, convert the current into current-voltage, form a relatively stable voltage signal, and perform gain amplification process, which can make the signal used for acquisition more stable, ensuring that subsequent acquisition work and information analysis and processing work can be carried out normally.

[0035] This embodiment provides a light intensity regulation control module based on a distributed optical fiber fire detector. As a preferred implementation, the signal sampling circuit includes an amplification circuit and an acquisition circuit. The acquisition circuit includes an ADC analog-to-digital converter. The function of the ADC analog-to-digital converter is to convert the collected voltage analog signal into a digital signal that is convenient for digital circuit processing.

[0036] The present embodiment provides a light intensity regulation control module based on a distributed optical fiber fire detector. As a preferred implementation, the control circuit includes an FPGA chip. The FPGA chip analyzes and processes the input digital signal, and uses the built-in program of the FPGA chip to automatically analyze the information in the digital signal to obtain the output optical power of the DFB laser, and use this to judge the working state of the DFB laser. According to different working states, corresponding different control signals are generated to control the optical power supplement circuit to perform different operations.

[0037] The present embodiment provides a light intensity regulation control module based on a distributed optical fiber fire detector. As a preferred implementation, the FPGA chip uses FPGA-XQ7A100T. The reason for selecting FPGA-XQ7A100T is that in a high-speed data acquisition system, FPGA-XQ7A100T can quickly process and analyze digital signals from the acquisition circuit. Its high bandwidth and low latency characteristics make it very suitable for the light intensity regulation control module provided in the present embodiment, which can perform fast information processing in real time and respond in time to ensure the stability of detection.

[0038] This embodiment provides a light intensity regulation control module based on a distributed optical fiber fire detector. As a preferred implementation, the optical power supplementation circuit includes a pump laser. The pump laser can provide additional gain for the DFB laser, enhance the output optical power of the DFB laser, ensure the continuous operation and performance of the DFB laser, help the DFB laser achieve long-distance detection, and improve detection stability.

[0039] The present embodiment provides a light intensity regulation control module based on a distributed optical fiber fire detector, as a preferred implementation, which also includes a DFB laser fault alarm circuit. The DFB laser fault alarm circuit includes a transistor and an LED light source. When the control circuit analyzes and finds that the output optical power of the DFB laser is abnormal (lower than the normal working range), a fault alarm signal will be output to the DFB laser fault alarm circuit, and the LED light source of the DFB laser fault alarm circuit will be started to remind the staff to replace the DFB laser and eliminate the fault.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A light intensity regulation control module based on distributed optical fiber fire detector, characterized in that: It includes a DFB laser, a signal sampling circuit, a control circuit and an optical power supplement circuit; The current signal input end of the signal sampling circuit is electrically connected to the current signal output end of the DFB laser; the signal sampling circuit converts the input current signal into a digital signal and outputs it through the digital signal output end; The digital signal input end of the control circuit is electrically connected to the digital signal output end of the signal sampling circuit; the control signal output end of the control circuit is electrically connected to the control signal input end of the optical power supplement circuit, and the optical power supplement circuit receives the control signal and outputs an optical signal at its output end.

2. The light intensity regulation control module based on the distributed optical fiber fire detector according to claim 1 is characterized in that: The signal sampling circuit includes an amplifier circuit and a collection circuit, the input end of the amplifier circuit is electrically connected to the current signal output end of the DFB laser as a current signal input end, and the voltage analog signal output end of the amplifier circuit is electrically connected to the voltage analog signal input end of the collection circuit, and is used to convert the input current signal into a voltage analog signal and output it to the collection circuit; The acquisition circuit converts the input voltage analog signal into a digital signal, and the output end of the acquisition circuit serves as a digital signal output end and is electrically connected to the digital signal input end of the control circuit.

3. The light intensity regulation control module based on the distributed optical fiber fire detector according to claim 2 is characterized in that: The amplifying circuit includes a transimpedance amplifier circuit and an operational amplifier circuit; The input end of the transimpedance amplifier circuit is electrically connected to the current signal output end of the DFB laser as a current signal input end, and the voltage signal output end of the transimpedance amplifier circuit is electrically connected to the voltage signal input end of the operational amplifier circuit, for converting the input current signal into an amplified voltage signal and outputting it to the operational amplifier circuit; The output end of the operational amplifier circuit is electrically connected to the voltage analog signal input end of the acquisition circuit as a voltage analog signal output end, and is used to perform secondary amplification on the input voltage signal to form a voltage analog signal, and output it to the acquisition circuit.

4. The light intensity regulation control module based on distributed optical fiber fire detector according to claim 2 is characterized in that: The acquisition circuit includes an ADC analog-to-digital converter, the input end of the ADC analog-to-digital converter is electrically connected to the voltage analog signal output end of the amplifier circuit as a voltage analog signal input end; the output end of the ADC analog-to-digital converter is electrically connected to the digital signal input end of the control circuit as a digital signal output end, the ADC analog-to-digital converter converts the input voltage analog signal into a corresponding digital signal, and outputs the digital signal to the control circuit through the digital signal output end.

5. The light intensity regulation control module based on distributed optical fiber fire detector according to claim 1 is characterized in that: The control circuit includes an FPGA chip, the input end of the FPGA chip is electrically connected to the digital signal output end of the signal sampling circuit as a digital signal input end, and the output end of the FPGA chip is electrically connected to the signal input end of the optical power supplement circuit.

6. The light intensity regulation control module based on the distributed optical fiber fire detector according to claim 5 is characterized in that: The FPGA chip adopts FPGA-XQ7A100T.

7. The light intensity regulation control module based on distributed optical fiber fire detector according to claim 1 is characterized in that: The optical power supplement circuit comprises a pump laser, the input end of the pump laser is electrically connected to the control signal output end of the control circuit, and the output end of the pump laser outputs an optical signal.

8. The light intensity regulation control module based on distributed optical fiber fire detector according to claim 1 is characterized in that: It also includes a DFB laser fault alarm circuit, wherein a fault alarm signal input end of the DFB laser fault alarm circuit is electrically connected to a fault alarm signal output end of the control circuit.

9. The light intensity regulation control module based on distributed optical fiber fire detector according to claim 8, characterized in that: The DFB laser fault alarm circuit comprises a transistor and an LED light source, the collector of the transistor is set as the fault alarm signal input end of the DFB laser fault alarm circuit, the emitter of the transistor is electrically connected to the LED light source, and the base of the transistor is grounded.

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