Optical flame detection apparatus

Abstract

An optical flame detection apparatus, mainly comprising a blue light sensor, an orange light sensor, an exclusive OR circuit module (U3), and a main control unit, wherein the blue light sensor is connected to the exclusive OR circuit module (U3) by means of a first amplification and comparison unit, and the orange light sensor is connected to the exclusive OR circuit module (U3) by means of a second amplification and comparison unit. In the optical flame detection apparatus, light signals are acquired by means of the blue light sensor and the orange light sensor, the amplification and comparison units are used for receiving and amplifying measured values of the blue light sensor and the orange light sensor, comparing amplified analog quantities with a standard value by means of the characteristics of light of a real flame, and outputting digital quantity signals for a subsequent circuit to perform logical determination, and the exclusive OR circuit module (U3) outputs true-value logic or false-value logic, so as to obtain a final flame recognition result, thereby improving the recognition accuracy of current flame detection as much as possible, and reducing the false alarm rate.

Description

Optical flame detection device TECHNICAL FIELD

[0001] The utility model relates to flame detection technical field, specifically, an optical flame detection device. BACKGROUND

[0002] Spectral signal: the spectral signal of a flame can be easily obtained by filters mounted on a set of infrared sensors. For example, a CO2 flame emits light at 4.3 microns, a hydrogen flame emits light at 2.7 microns, and a CH4 flame emits light at 3.3 microns. 3.09 microns to 3.95 microns are commonly used as reference light. The most common way to distinguish a flame from all other light sources is to look at the ratio of this different spectrum.

[0003] Temporal variation signal of flame: the temporal signal of a flame is produced by the efficiency of oxygen supply. An oxygen-rich flame emits blue light. An oxygen-poor flame has more orange emission. The alternation of blue and orange results in the flickering of the flame. The flickering light can also be caused by vibrating light. Therefore, the flickering light will become a potential false alarm source for many flame detectors.

[0004] SUMMARY

[0005] The utility model aims at providing an optical flame detection device to solve the false alarm problem of the flame detector in the prior art.

[0006] Specifically, the characteristics of a real flame are: according to the different oxygen content, the proportion of blue light and orange light generated by the flame at the same time is different, and it oscillates between 5hz to 20hz to present the characteristics of this wax and wane, which is applicable to any moment, and the proportion of blue light and orange light emitted by other flickering light at the same moment does not have such characteristics, according to this difference, real flame and false flame can be effectively distinguished.

[0007] The embodiment of the utility model realizes by the following technical schemes:

[0008] An optical flame detection device, comprising a blue light sensor, an orange light sensor, an XOR circuit module and a main control unit, the blue light sensor is connected with the XOR circuit module through a first amplification comparison unit, the orange light sensor is connected with the XOR circuit module through a second amplification comparison unit, the first amplification comparison unit is used for the analog quantity of blue light sensor detection and compares with the standard value after amplification, and the digital quantity signal is output, the second amplification comparison unit is used for the analog quantity of orange light sensor detection and compares with the standard value after amplification, and the digital quantity signal is output, the XOR circuit module is connected with the main control unit, and is used for receiving the signal of the first amplification comparison unit and the second amplification comparison unit and outputting the XOR result to the main control unit.

[0009] Preferably, the first amplification comparison unit comprises a first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor and a ninth resistor;

[0010] The blue light sensor is connected with the third resistor, the third resistor is connected with the non-inverting input terminal of the first amplifier and the fourth resistor;

[0011] The inverting input terminal of the first amplifier is connected with the first resistor and the second resistor, and the output terminal of the first amplifier is connected with the XOR circuit module, the fourth resistor and the fifth resistor.

[0012] Preferably, the second amplification comparison unit comprises a first amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a tenth resistor;

[0013] The orange light sensor is connected with the seventh resistor, and the seventh resistor is connected with the non-inverting input terminal of the second amplifier and the eighth resistor;

[0014] The inverting input terminal of the second amplifier is connected with the fifth resistor and the sixth resistor, and the output terminal of the second amplifier is connected with the XOR circuit module, the eighth resistor and the tenth resistor.

[0015] The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0016] The structure provided by the utility model is mainly composed of a blue light sensor, an orange light sensor, an XOR circuit module and a main control unit, the blue light sensor is connected with the XOR circuit module through a first amplification comparison unit, the orange light sensor is connected with the XOR circuit module through a second amplification comparison unit, the XOR circuit module is connected with the main control unit, and is used for receiving amplified light signals and outputting XOR results to the main control unit. Through the above structure, the blue light sensor and the orange light sensor collect light signals, the amplification comparison unit is used for receiving measurement values of the amplified blue light sensor and orange light sensor, the light characteristics of a real flame are compared with standard values, an analog quantity after amplification is compared with a standard value, a digital quantity signal for subsequent circuit logic judgment is output, a true value logic or a false value logic is output through the XOR circuit module, and finally the recognition result of the flame is obtained, so that the recognition accuracy of the current flame detection is improved as much as possible, and the false alarm rate is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the premise of the drawings.

[0018] Fig. 1 is a structural schematic diagram of the present application;

[0019] Fig. 2 is a blue light flame waveform diagram of the present application;

[0020] Fig. 3 is an orange light flame waveform diagram of the present application.

[0021] Fig. 1 is a structural schematic diagram of the present application; DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application, and obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Please refer to Fig. 1, an optical flame detection device, comprising a blue light sensor, an orange light sensor, an exclusive or circuit module U3 and a master control unit, the blue light sensor is connected with the exclusive or circuit module U3 through a first amplification comparison unit, the orange light sensor is connected with the exclusive or circuit module U3 through a second amplification comparison unit, the first amplification comparison unit is used for comparing the analog quantity detected by the blue light sensor with a standard value after amplification, and outputs a digital signal, the second amplification comparison unit is used for comparing the analog quantity detected by the orange light sensor with a standard value after amplification, and outputs a digital signal, the exclusive or circuit module U3 and the master control unit are used for receiving the signals of the first amplification comparison unit and the second amplification comparison unit and outputting an exclusive or result to the master control unit.

[0024] The utility model discloses an implementation provides the structure mainly includes blue light sensor, orange light sensor, exclusive or circuit module U3 and main control unit, and blue light sensor is connected with exclusive or circuit module U3 through the first amplification comparison unit, and orange light sensor is connected with exclusive or circuit module U3 through the second amplification comparison unit, and exclusive or circuit module U3 is connected with main control unit, for receiving the light signal of amplification and output exclusive or result to main control unit. Through above -mentioned structure, through blue light sensor and orange light sensor gather light signal, through the characteristic of the light of real flame, the blue light and orange light of flame should be present how signal, output true value logic or false value logic through exclusive or circuit module U3, to obtain the identification result of final flame, to improve the identification accuracy of current flame detection as far as possible, reduce the false alarm rate.

[0025] One example embodiment of the utility model, the first amplification comparison unit includes first amplifier U1, first resistance R1, second resistance R2, third resistance R3, fourth resistance R4 and ninth resistance R9;

[0026] Blue light sensor is connected with third resistance R3, and third resistance R3 is connected with the same phase input end of first amplifier U1 and fourth resistance R4;

[0027] The opposite phase input end of first amplifier U1 is connected with first resistance R1 and second resistance R2, and the output end of first amplifier U1 is connected with exclusive or circuit module U3, fourth resistance R4 and fifth resistance R5.

[0028] One example embodiment of the utility model, the second amplification comparison unit includes first amplifier U1, fifth resistance R5, sixth resistance R6, seventh resistance R7, eighth resistance R8 and tenth resistance R10;

[0029] Orange light sensor is connected with seventh resistance R7, and seventh resistance R7 is connected with the same phase input end of second amplifier U2 and eighth resistance R8;

[0030] The opposite phase input end of second amplifier U2 is connected with fifth resistance R5 and sixth resistance R6, and the output end of second amplifier U2 is connected with exclusive or circuit module U3, eighth resistance R8 and tenth resistance R10.

[0031] Among them, the first amplification comparison unit and blue light sensor, or, the second amplification comparison unit and orange light sensor can be provided with a capacitor, to filter out DC signal, so that the amplifier only acts on the signal of change. Any signal of this increase will have true value logic 1. From high to low signal will be false logic 0.

[0032] Among them, the model of first amplifier U1 and second amplifier U2 is LM2903, the model of exclusive or circuit module U3 is 74HC86, and the model of main control device is TiAC.

[0033] As shown in Fig. 2, with the passage of time, blue light will oscillate between 5hz to 20hz, define the rising is true fire.

[0034] As shown in Fig. 3, with the passage of time, orange light and blue light at the same frequency, but lagged 180 degrees, define the rising is true fire.

[0035] According to the above-mentioned logic value output mode of the XOR circuit module U3, the blue light outputs true value logic 1 when rising, and true value logic 0 when falling from high to low, and similarly, the orange light outputs true value logic 1 when rising, and true value logic 0 when falling from high to low.

[0036] It should be noted that the above-mentioned judgment logic is directly set by the prior art according to the characteristics of the flame.

[0037] Since the orange light lags behind the blue light by 180 degrees, if it is a true fire state, the blue light rises when the orange light falls, and the orange light rises when the blue light falls, and the rest is false fire, so the following Table 1 can be obtained:

[0038] Table 1 XOR circuit module logic output table

[0039] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An optical flame detection device, characterized in that The application relates to a blue light sensor, an orange light sensor, an exclusive or circuit module and a master control unit, wherein the blue light sensor is connected with the exclusive or circuit module through a first amplification comparison unit, the orange light sensor is connected with the exclusive or circuit module through a second amplification comparison unit, the first amplification comparison unit is used for amplifying analog signals detected by the blue light sensor and comparing the amplified analog signals with standard values, and digital signals are output; the second amplification comparison unit is used for amplifying analog signals detected by the orange light sensor and comparing the amplified analog signals with standard values, and digital signals are output; the exclusive or circuit module is connected with the master control unit, and is used for receiving signals of the first amplification comparison unit and the second amplification comparison unit and outputting exclusive or results to the master control unit.

2. An optical flame detection apparatus according to claim 1, wherein The first amplification comparison unit comprises a first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor and a ninth resistor; The blue light sensor is connected with the third resistor, and the third resistor is connected with the non-inverting input terminal of the first amplifier and the fourth resistor; The inverting input terminal of the first amplifier is connected with the first resistor and the second resistor, and the output terminal of the first amplifier is connected with the exclusive or circuit module, the fourth resistor and a fifth resistor.

3. An optical flame detection apparatus according to claim 1, wherein The second amplification comparison unit comprises a first amplifier, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a tenth resistor; The orange light sensor is connected with the seventh resistor, and the seventh resistor is connected with the non-inverting input terminal of the second amplifier and the eighth resistor; The inverting input terminal of the second amplifier is connected with the fifth resistor and the sixth resistor, and the output terminal of the second amplifier is connected with the exclusive or circuit module, the eighth resistor and the tenth resistor.

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