CN208888116U - Detection circuit for infrared detection of smoke concentration - Google Patents
Detection circuit for infrared detection of smoke concentration Download PDFInfo
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- CN208888116U CN208888116U CN201821350003.8U CN201821350003U CN208888116U CN 208888116 U CN208888116 U CN 208888116U CN 201821350003 U CN201821350003 U CN 201821350003U CN 208888116 U CN208888116 U CN 208888116U
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- 238000001514 detection method Methods 0.000 title claims abstract description 72
- 239000000779 smoke Substances 0.000 title abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 76
- 230000005611 electricity Effects 0.000 claims description 13
- 235000019504 cigarettes Nutrition 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000012937 correction Methods 0.000 abstract description 12
- 238000012360 testing method Methods 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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Abstract
The utility model discloses a detection circuit for detecting smoke concentration by infrared, which comprises a processing module, an infrared receiving tube and an infrared transmitting tube; the infrared receiving tube is connected with the processing module and used for acquiring current environment light and smoke to obtain voltage signals corresponding to the current environment light and smoke and sending the voltage signals corresponding to the current environment light and smoke to the processing module; the processing module is connected with the infrared transmitting tube and is used for controlling the opening and closing of the infrared transmitting tube; the processing module is used for compensating the smog concentration that obtains current smog and correspond to the voltage signal of infrared receiving tube, like this, the utility model discloses a control infrared emission tube open with close the voltage signal who detects the correspondence of environment light sum ambient light sum and the infrared light that detects smog respectively, can effectively revise the influence of ambient light to the test result, in addition, the utility model discloses utilize the negative temperature characteristic of the PN junction of diode, adopt the temperature compensation circuit to carry out the temperature correction, can effectively solve the influence of the temperature characteristic of wafing of infrared receiving tube to the test result.
Description
Technical field
The utility model belongs to range hood control technology field, and in particular to a kind of detection of infrared detection smokescope
Circuit.
Background technique
Infrared smoke Concentration Testing detects feasible realization rate as a kind of inexpensive smokescope.The cigarette of range hood
Mistiness degree generallys use infrared light and is detected, and the method for infrared smoke Concentration Testing has the characteristics that simple possible, at low cost,
But it is usually larger by environment light and ambient temperature effect using infrared detection；Currently, being typically employed in darkroom measurement to reduce
Smoke path is specifically designed to labyrinth by the influence of environment light, and the smoke path of labyrinth shape forms environment brightness room, to drop
The influence of low ambient light, still, structure of the detecting device are complicated, at high cost；In addition, infrared light adopter is due to the shadow by temperature
It rings, test value can be bigger than normal when temperature increases, and infrared light adopter temperature drift characteristic influences the accuracy of smokescope detection.
Utility model content
In view of this, the main purpose of the utility model is to provide a kind of detection circuits of infrared detection smokescope.
In order to achieve the above objectives, the technical solution of the utility model is achieved in that
The utility model embodiment provides a kind of detection circuit of infrared detection smokescope, including processing module, infrared
Reception pipe and infrared transmitting tube；The infrared receiving tube is connect with processing module, is obtained for acquiring current environment light and smog
Current environment light and the corresponding voltage signal of smog are taken, and corresponding to the processing module transmission current environment light and smog
Voltage signal；The processing module is connect with infrared transmitting tube, for controlling the opening and closing of infrared transmitting tube；The processing
Module, which is used to compensate for the voltage signal of infrared receiving tube, obtains the corresponding smokescope of current smog.
Further include temperature-compensation circuit in above scheme, the temperature-compensation circuit is connect with processing module, for pair
The voltage signal of the infrared receiving tube carries out temperature-compensating；The processing module is used for according to the infrared receiver after temperature-compensating
The voltage signal of pipe, the corresponding smokescope of current smog after obtaining temperature-compensating.
It further include amplifying circuit in above scheme, one end of the amplifying circuit is connect with processing module, the other end point
It is not connect with infrared receiving tube and temperature-compensation circuit.
In above scheme, constant-current circuit, the constant-current circuit are additionally provided between the processing module and infrared transmitting tube
Including the second chip U2, the tenth resistance R10, the first end of the second chip U2 is connected to power supply through the tenth resistance R10, and second
End is connect with infrared transmitting tube, and third end is combined into the 4th end and is grounded afterwards all the way, and the 5th end is connect with processing module.
In above scheme, the processing module includes the first chip U1, twelfth resistor R12, thirteenth resistor R13, institute
The first end connection power supply of the first chip U1 is stated, second end is sequentially connected second amplifying circuit, level-one amplifying circuit and infrared connects
Closed tube, third end are sequentially connected constant-current circuit and infrared transmitting tube, the 5th end ground connection, six end connecting twelfth resistor R12 it
After be connected with communicating circuit, be connected with communicating circuit after the 7th end connection thirteenth resistor R13.
In above scheme, the temperature-compensation circuit includes first diode D1, first resistor R1, second resistance R2,
One end of three resistance R3, the 5th resistance R5, the first resistor R1 connect to power supply, the anode of the other end and first diode D1
Connection, the other end are also successively grounded after second resistance R2 and 3rd resistor R3, and the other end is after second resistance R2 through the 5th
Resistance R5 is connect with amplifying circuit, the cathode ground connection of the first diode D1.
In above scheme, the amplifying circuit includes level-one amplifying circuit and second amplifying circuit；
The level-one amplifying circuit includes the first operational amplifier U3, the 4th resistance R4, the 6th resistance R6, the 7th resistance
R7, first capacitor C1, the first feedback resistance Rf1, the non-inverting input terminal and temperature-compensation circuit of the first operational amplifier U3
Connection, non-inverting input terminal also successively access power supply through the 6th resistance R6 and the 4th resistance R4, and non-inverting input terminal is through the 6th resistance R6
It is also connect later with infrared receiving tube, successively the first feedback resistance Rf1 of parallel connection and first is electric between non-inverting input terminal and output end
Hold C1, inverting input terminal is grounded through the 7th resistance R7, and output end is connect with second amplifying circuit；
The second amplifying circuit includes second operational amplifier U4, the 8th resistance R8, the 9th resistance R9, the second feedback electricity
Rf2 is hindered, the non-inverting input terminal of the second operational amplifier U4 is grounded through the 9th resistance R9, and inverting input terminal is through the 8th resistance R8
It is connect with level-one amplifying circuit, the second feedback resistance Rf2 in parallel, output end and processing module between inverting input terminal and output end
1 connection.
In above scheme, the infrared receiving tube includes the second light emitting diode D2, the second light emitting diode D2's
Plus earth, cathode are connect with amplifying circuit.
In above scheme, the infrared transmitting tube includes third light emitting diode D3, the third light emitting diode D3's
Anode is connect with constant-current circuit, and cathode connects power supply.
It further include communicating circuit in above scheme, the communicating circuit includes fifth chip U5, the fifth chip U5
First end connect to power supply, second end is connect with processing module, and third end is connect with processing module, the 4th end ground connection.
Compared with prior art, the utility model provides a kind of detection circuit of infrared detection smokescope, including place
Manage module, infrared receiving tube and infrared transmitting tube；The infrared receiving tube is connect with processing module, works as front ring for acquiring
Border light and smog obtain current environment light and the corresponding voltage signal of smog, and send the current environment light to processing module
Voltage signal corresponding with smog；The processing module is connect with infrared transmitting tube, for control infrared transmitting tube opening and
It closes；It is dense that the processing module is used to compensate the corresponding smog of the current smog of acquisition for the voltage signal of infrared receiving tube
Degree, in this way, the utility model detects environment light as infrared receiving tube using visible light photosensitive tube, it is infrared by controlling
The opening and closing of transmitting tube detect the corresponding voltage signal of the infrared light of environment light and environment light and detection smog, energy respectively
Influence of the enough effectively amendment environment light to test result, in addition, the utility model is adopted using the subzero temperature characteristic of the PN junction of diode
Temperature adjustmemt is carried out with temperature-compensation circuit, can effectively solve the problem that influence of the temperature drift characteristic of infrared receiving tube to test result.
Detailed description of the invention
Fig. 1 provides a kind of connection block diagram one of the detection circuit of infrared detection smokescope for the utility model embodiment；
Fig. 2 provides a kind of connection block diagram two of the detection circuit of infrared detection smokescope for the utility model embodiment；
Fig. 3 provides a kind of connection block diagram three of the detection circuit of infrared detection smokescope for the utility model embodiment；
Fig. 4 provides a kind of circuit diagram of the detection circuit of infrared detection smokescope for the utility model embodiment；
Fig. 5 provides a kind of voltage output-temperature of the detection circuit of infrared detection smokescope for the utility model embodiment
It spends characteristic and adjusts schematic diagram.
Appended drawing reference is as follows:
1 --- processing module, 2 --- infrared receiving tube, 3 --- infrared transmitting tube, 4 --- temperature-compensation circuit, 5 ---
--- --- second amplifying circuit, 6 --- the constant-current circuit, 7 --- communicating circuit of level-one amplifying circuit, 52 of amplifying circuit, 51.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Embodiment 1
The utility model embodiment 1 provides a kind of detection circuit of infrared detection smokescope, as shown in Figure 1, including place
Manage module 1, infrared receiving tube 2 and infrared transmitting tube 3；Infrared receiving tube 2 is connect with processing module 1, works as front ring for acquiring
Border light and smog obtain current environment light and the corresponding voltage signal of smog, and send the current environment to processing module 1
Light and the corresponding voltage signal of smog；Processing module 1 is connect with infrared transmitting tube 3, for control infrared transmitting tube 3 opening and
It closes；It is dense that processing module 1 is used to compensate the corresponding smog of the current smog of acquisition for the voltage signal of infrared receiving tube 2
Degree.
Wherein, processing module 1 includes the first chip U1, twelfth resistor R12, thirteenth resistor R13, first chip
The first end of U1 connects power supply, and second end connects infrared receiving tube, and third end connects infrared transmitting tube, and the 5th end is grounded, and the 6th
It is connected with communicating circuit after end connection twelfth resistor R12, is connected with communication electricity after the 7th end connection thirteenth resistor R13
Road.
Wherein, infrared receiving tube 2 includes the second light emitting diode D2, the plus earth of the second light emitting diode D2, cathode
It is connect with processing module 1.
Wherein, infrared transmitting tube 3 includes third light emitting diode D3, the anode and processing module of third light emitting diode D3
1 connection, cathode connect power supply.
Wherein, the first chip U1 uses CSE7766 chip；Infrared receiving tube 2 uses visible light photosensitive tube.
The course of work of the utility model: the detection circuit of infrared detection smokescope provided by the utility model is used
Detection device carries out Smoke Detection, and detection device is mounted at the blower in the exhaust fume collecting hood of range hood, and infrared transmitting tube
There are certain differences with infrared receiving tube.
Specific detection process are as follows: the opening and closing that infrared transmitting tube 3 is controlled by processing module 1, firstly, in no oil smoke
In the state of, control infrared transmitting tube 3 is closed, at this point, infrared receiving tube 2 receives environment light, the corresponding voltage of environment light is obtained,
And the corresponding voltage of environment light is sent to processing module 1；Then, in the state of having oil smoke, control infrared transmitting tube 3 is beaten
It opens, infrared receiving tube 2 receives the infrared light that infrared transmitting tube 3 emits, at this point, processing module 1 obtains environment light and infrared light pair
The voltage answered, and environment light and the corresponding voltage of infrared light are sent to processing module 1, and when there is smog generation, by unrestrained
Reflection detects the size that infrared luminous intensity is smokescope, therefore, environment light and the corresponding voltage of infrared light and environment light pair
The difference for the voltage answered is exactly the corresponding virtual voltage of smokescope；Finally, due to pre-set ideal shape in processing module 1
The corresponding relationship of smokescope and voltage under state can determine current smokescope by comparison, wherein ideally cigarette
The corresponding relationship of mistiness degree and voltage is utilized in the corresponding relationship of the smokescope and voltage that measure under darkroom；Therefore, this reality
The structure that detection device can be simplified with the detection circuit of novel infrared detection smokescope is not required to be arranged in detection device
Darkroom and smoke path are preset using the corresponding relationship to ideally smokescope and voltage, are modified environment light
Afterwards, directly comparison determines current smokescope, can effectively correct influence of the environment light to test result.
Embodiment 2
The utility model embodiment 2 provides a kind of detection circuit of infrared detection smokescope, as shown in Fig. 2, including place
Manage module 1, infrared receiving tube 2 and infrared transmitting tube 3；Infrared receiving tube 2 is connect with processing module 1, works as front ring for acquiring
Border light and smog obtain current environment light and the corresponding voltage signal of smog, and send the current environment to processing module 1
Light and the corresponding voltage signal of smog；Processing module 1 is connect with infrared transmitting tube 3, for control infrared transmitting tube 3 opening and
It closes；It is dense that processing module 1 is used to compensate the corresponding smog of the current smog of acquisition for the voltage signal of infrared receiving tube 2
Degree；
It further includes temperature-compensation circuit 4, and the temperature-compensation circuit 4 is connect with processing module 1, for described infrared
The voltage signal of reception pipe 2 carries out temperature-compensating；The processing module 1 is used for according to the infrared receiving tube 2 after temperature-compensating
Voltage signal, the corresponding smokescope of current smog after obtaining temperature-compensating.
Since infrared receiving tube 2 has negative temperature characteristic, the voltage of infrared receiving tube 2 is dropped with the raising of environment temperature
Low, temperature-compensation circuit 4 can supplement this portion voltage of the reduction of infrared receiving tube 2, to realize the electricity to infrared receiving tube 2
Signal is pressed to carry out temperature-compensating.
Corresponding voltage carries out temperature when acquiring current environment light and smog to infrared receiving tube using temperature-compensation circuit
Compensation, specifically, being detected in the smog of default mean concentration red under different temperatures in the state of closing temperature compensation circuit
The corresponding voltage of outer reception pipe obtains the voltage of infrared receiving tube and the reference curve of temperature；In opening temperature compensation circuit
Under state, the corresponding voltage of infrared receiving tube under different temperatures is detected, the correction of the voltage and temperature that obtain infrared receiving tube is bent
Line；The resistance value of the resistance in adjustment temperature-compensation circuit is repeated, until detection obtains the voltage and temperature of infrared receiving tube again
Correction curve with referring to curve matching when, the correction curve of the voltage of the infrared receiving tube and temperature is referring to correction curve；
Corresponding electricity when according to the compensated infrared receiving tube acquisition current environment light of the reference correction curve temperature and smog
Pressure.
Wherein, processing module 1 includes the first chip U1, twelfth resistor R12, thirteenth resistor R13, first chip
The first end of U1 connects power supply, and second end connects infrared receiving tube, and third end connects infrared transmitting tube, and the 5th end is grounded, and the 6th
It is connected with communicating circuit 7 after end connection twelfth resistor R12, is connected with communication after the 7th end connection thirteenth resistor R13
Circuit 7.
Wherein, infrared receiving tube 2 includes the second light emitting diode D2, the plus earth of the second light emitting diode D2, cathode
It is connect with processing module 1.
Wherein, infrared transmitting tube 3 includes third light emitting diode D3, the anode and processing module of third light emitting diode D3
1 connection, cathode connect power supply.
Wherein, the first chip U1 uses CSE7766 chip；Infrared receiving tube 2 uses visible light photosensitive tube.
Wherein, temperature-compensation circuit 4 include first diode D1, first resistor R1, second resistance R2,3rd resistor R3,
One end of 5th resistance R5, the first resistor R1 connect to power supply, and the other end is connect with the anode of first diode D1, another
End is also successively grounded after second resistance R2 and 3rd resistor R3, and the other end is after second resistance R2 through the 5th resistance R5 and place
It manages module 1 to connect, the cathode ground connection of the first diode D1.
The utility model controls the opening and closing of infrared transmitting tube 3 by processing module 1, firstly, in the shape of no oil smoke
Under state, control infrared transmitting tube 3 is closed, at this point, infrared receiving tube 2 receives environment light, obtains the corresponding voltage of environment light, and will
The corresponding voltage of environment light is sent to processing module 1；Then, in the state of having oil smoke, control infrared transmitting tube 3 is opened, red
Outer reception pipe 2 receives the infrared light that infrared transmitting tube 3 emits, at this point, processing module 1 obtains environment light and the corresponding electricity of infrared light
Pressure, and environment light and the corresponding voltage of infrared light are sent to processing module 1, and when there is smog generation, it is examined by diffusing reflection
The size that infrared luminous intensity is smokescope is surveyed, therefore, environment light and the corresponding voltage of infrared light electricity corresponding with environment light
The difference of pressure is exactly the corresponding virtual voltage of smokescope；Finally, due to pre-set ideally cigarette in processing module 1
The corresponding relationship of mistiness degree and voltage can determine current smokescope by comparison, wherein ideally smokescope
The corresponding relationship of the smokescope and voltage that measure under darkroom is utilized in the corresponding relationship of voltage；Therefore, the utility model
The detection circuit of infrared detection smokescope can simplify the structure of detection device, be not required to be arranged in detection device darkroom and
Smoke path is preset using the corresponding relationship to ideally smokescope and voltage, after the modification of environment light, directly
Comparison determines current smokescope, can effectively correct influence of the environment light to test result；Further, since the circuit uses
Temperature-compensation circuit has carried out temperature-compensating, and therefore, environment light and the corresponding voltage of infrared light voltage corresponding with environment light are equal
For the voltage after temperature-compensating, that is, after the corresponding virtual voltage of mistiness degree obtained is also temperature-compensating, accordingly, it is determined that currently
Smokescope is after temperature-compensating.
Embodiment 3
The utility model embodiment 2 provides a kind of detection circuit of infrared detection smokescope, as shown in figure 3, including place
Manage module 1, infrared receiving tube 2 and infrared transmitting tube 3；Infrared receiving tube 2 is connect with processing module 1, works as front ring for acquiring
Border light and smog obtain current environment light and the corresponding voltage signal of smog, and send the current environment to processing module 1
Light and the corresponding voltage signal of smog；Processing module 1 is connect with infrared transmitting tube 3, for control infrared transmitting tube 3 opening and
It closes；It is dense that processing module 1 is used to compensate the corresponding smog of the current smog of acquisition for the voltage signal of infrared receiving tube 2
Degree；
It further includes temperature-compensation circuit 4, and the temperature-compensation circuit 4 is connect with processing module 1, for described infrared
The voltage signal of reception pipe 2 carries out temperature-compensating；The processing module 1 is used for according to the infrared receiving tube 2 after temperature-compensating
Voltage signal, the corresponding smokescope of current smog after obtaining temperature-compensating.
It further includes amplifying circuit 5, and one end of the amplifying circuit 5 is connect with processing module 1, the other end respectively with it is infrared
Reception pipe 2 and temperature-compensation circuit 4 connect；Amplifying circuit 5 includes level-one amplifying circuit 51 and second amplifying circuit 52.
Wherein, it is additionally provided with constant-current circuit 6 between processing module 1 and infrared transmitting tube 3, the constant-current circuit 6 includes the
The first end of two chip U2, the tenth resistance R10, the second chip U2 are connected to power supply through the tenth resistance R10, second end with it is red
Outer transmitting tube 3 connects, and third end is combined into the 4th end and is grounded afterwards all the way, and the 5th end is connect with processing module 1.
It further includes communicating circuit 7, communicating circuit 7 be used for range hood communication connection, controlled and inhaled according to smokescope
The gear switch of kitchen ventilator.
Wherein, processing module 1 includes the first chip U1, twelfth resistor R12, thirteenth resistor R13, first chip
The first end of U1 connects power supply, and second end is sequentially connected second amplifying circuit, level-one amplifying circuit and infrared receiving tube, third end
It is sequentially connected constant-current circuit and infrared transmitting tube, the 5th end ground connection, six end connecting twelfth resistor R12 is connected with communication later
Circuit, the 7th end connection thirteenth resistor R13 are connected with communicating circuit later.
Wherein, infrared receiving tube 2 includes the second light emitting diode D2, the plus earth of the second light emitting diode D2, cathode
It is connect with amplifying circuit 5.
Wherein, infrared transmitting tube 3 includes third light emitting diode D3, the anode and constant-current circuit of third light emitting diode D3
6 connections, cathode connect power supply.
Wherein, the first chip U1 uses CSE7766 chip；Infrared receiving tube 2 uses visible light photosensitive tube.
Wherein, temperature-compensation circuit 4 include first diode D1, first resistor R1, second resistance R2,3rd resistor R3,
One end of 5th resistance R5, the first resistor R1 connect to power supply, and the other end is connect with the anode of first diode D1, another
End be also successively grounded after second resistance R2 and 3rd resistor R3, the other end after second resistance R2 through the 5th resistance R5 with put
Big circuit 5 connects, the cathode ground connection of the first diode D1.
Wherein, level-one amplifying circuit 51 includes the first operational amplifier U3, the 4th resistance R4, the 6th resistance R6, the 7th electricity
Hinder R7, first capacitor C1, the non-inverting input terminal of the first feedback resistance Rf1, the first operational amplifier U3 and temperature-compensating electricity
Road connection, non-inverting input terminal also successively access power supply through the 6th resistance R6 and the 4th resistance R4, and non-inverting input terminal is through the 6th resistance
It is also connect with infrared receiving tube after R6, successively parallel connection the first feedback resistance Rf1 and first between non-inverting input terminal and output end
Capacitor C1, inverting input terminal are grounded through the 7th resistance R7, and output end is connect with second amplifying circuit 52；
Second amplifying circuit 52 includes second operational amplifier U4, the 8th resistance R8, the 9th resistance R9, the second feedback resistance
The non-inverting input terminal of Rf2, the second operational amplifier U4 are grounded through the 9th resistance R9, inverting input terminal through the 8th resistance R8 with
Level-one amplifying circuit 51 connects, the second feedback resistance Rf2 in parallel, output end and processing module between inverting input terminal and output end
1 connection.
Wherein, communicating circuit 7 includes fifth chip U5, and the first end of the fifth chip U5 connects to power supply, second end
It is connect with thirteenth resistor R13, third end is connect with twelfth resistor R12, the 4th end ground connection.
The course of work of the utility model:
Firstly, being amplified using voltage signal of the amplifying circuit to temperature-compensation circuit；
Specifically, the voltage computing formula of level-one amplifying circuit, as shown in formula (1)；
The voltage computing formula of second amplifying circuit, as shown in formula (2)；
Wherein, U0 be level-one adder output voltage, U1 in level-one amplifying circuit be compensate 0 DEG C of diode when pipe pressure
Drop, the voltage that U2 is infrared infrared receiving tube；U3 is the voltage for being finally amplified into the first chip of processing module.Different
Under environment temperature, the sensitivity curve of infrared ray infrared receiving tube also can be different；By R2, R3, R5, resistance value adjustment is red to match
The voltage drift that outer infrared receiving tube is generated with temperature characterisitic；
Secondly, the voltage signal using amplified temperature-compensation circuit acquires current environment light and cigarette to infrared receiving tube
Corresponding voltage carries out temperature-compensating when mist；
Refering to what is shown in Fig. 5, curve a is the voltage of infrared receiving tube and the reference curve of temperature in figure, curve b is reference
Correction curve, curve c are the reference correction curve obtained after being fitted；
Specifically, detecting different temperatures in the smog of default mean concentration in the state of closing temperature compensation circuit
The corresponding voltage of lower infrared receiving tube obtains the voltage of infrared receiving tube and the reference curve of temperature；Electricity is compensated in opening temperature
In the state of road, the corresponding voltage of infrared receiving tube under different temperatures is detected, obtains the voltage of infrared receiving tube and rectifying for temperature
Positive curve；Repeat adjustment temperature-compensation circuit in resistance resistance value, until again detection obtain infrared receiving tube voltage with
When the correction curve of temperature is with referring to curve matching, the voltage of the infrared receiving tube and the correction curve of temperature are bent referring to correction
Line；It is corresponding when according to the compensated infrared receiving tube acquisition current environment light of the reference correction curve temperature and smog
Voltage.
Finally, carrying out ambient light compensation；
Specifically, closing infrared transmitting tube in the state of non smoke, infrared receiving tube acquisition current environment light acquisition is worked as
The corresponding voltage of preceding environment light；At this point, the voltage signal of acquisition is the corresponding voltage signal generated of environment light；
In the state of having smog, infrared transmitting tube is opened, infrared receiving tube acquires current smog and obtains current smog pair
The average voltage answered, specifically, opening infrared transmitting tube in the state of having smog, infrared receiving tube is spaced at interval of one
Time acquires current smog and obtains the corresponding voltage of current smog, will take after the corresponding voltage accumulation of current smog obtained every time
Average value is determined as the corresponding average voltage of current smog；At this point, the voltage signal of acquisition is that environment light and infrared light are corresponding
Voltage signal, and when there is smog generation, the size that infrared luminous intensity is smokescope is detected by diffusing reflection, it therefore, should
Voltage signal is environment light and the corresponding voltage signal of current smog；
According to the difference of the corresponding average voltage of current smog voltage corresponding with current environment light, current cigarette is determined
The corresponding virtual voltage of mist；
In darkroom, the smog of infrared receiving tube acquisition various concentration and the corresponding voltage of smog for obtaining various concentration,
Determine the corresponding relationship of preset ideally smokescope and voltage；By the corresponding virtual voltage of the current smog and pre-
If ideally smokescope and the corresponding relationship of voltage compare, determine the corresponding smokescope of current smog.
Therefore, the detection circuit of the infrared detection smokescope of the utility model can simplify the structure of detection device, no
Darkroom and smoke path need to be set in detection device, carried out using the corresponding relationship to ideally smokescope and voltage
Default, after the modification of environment light, directly comparison determines current smokescope, can effectively correct environment light to test result
It influences；Further, since the circuit has carried out temperature-compensating using temperature-compensation circuit, therefore, environment light and infrared light are corresponding
Voltage voltage corresponding with environment light is the voltage after temperature-compensating, that is, the corresponding virtual voltage of mistiness degree obtained is also temperature
Spend it is compensated, accordingly, it is determined that after current smokescope is temperature-compensating.
The utility model detects environment light as infrared receiving tube using visible light photosensitive tube, infrared by controlling
The opening and closing of transmitting tube detect the corresponding voltage signal of the infrared light of environment light and environment light and detection smog, energy respectively
Influence of the enough effectively amendment environment light to test result, in addition, the utility model is adopted using the subzero temperature characteristic of the PN junction of diode
Temperature adjustmemt is carried out with temperature-compensation circuit, can effectively solve the problem that influence of the temperature drift characteristic of infrared receiving tube to test result.
The above, the only preferred embodiment of the utility model, are not intended to limit the protection of the utility model
Range.
Claims (10)
1. a kind of detection circuit of infrared detection smokescope, which is characterized in that including processing module (1), infrared receiving tube
(2) and infrared transmitting tube (3)；
The infrared receiving tube (2) connect with processing module (1), obtains current environment light for acquiring current environment light and smog
Voltage signal corresponding with smog, and the current environment light and the corresponding voltage signal of smog are sent to processing module (1)；
The processing module (1) connect with infrared transmitting tube (3), for controlling the opening and closing of infrared transmitting tube (3)；It is described
Processing module (1) is used to carry out ambient light compensation for the voltage signal of infrared receiving tube (2) to obtain the corresponding cigarette of current smog
Mistiness degree.
2. a kind of detection circuit of infrared detection smokescope according to claim 1, which is characterized in that it further includes temperature
It spends compensation circuit (4), the temperature-compensation circuit (4) connect with processing module (1), for the infrared receiving tube (2)
Voltage signal carries out temperature-compensating；The processing module (1) is used to be believed according to the voltage of the infrared receiving tube (2) after temperature-compensating
Number, the corresponding smokescope of current smog after obtaining temperature-compensating.
3. a kind of detection circuit of infrared detection smokescope according to claim 2, which is characterized in that it further includes putting
Big circuit (5), one end of the amplifying circuit (5) are connect with processing module (1), the other end respectively with infrared receiving tube (2) and
Temperature-compensation circuit (4) connection.
4. a kind of detection circuit of infrared detection smokescope according to claim 3, which is characterized in that the processing mould
It is additionally provided between block (1) and infrared transmitting tube (3) constant-current circuit (6), the constant-current circuit (6) includes the second chip U2, the
Ten resistance R10, the first end of the second chip U2 are connected to power supply through the tenth resistance R10, second end and infrared transmitting tube (3)
Connection, third end are combined into the 4th end and are grounded afterwards all the way, and the 5th end is connect with processing module (1).
5. a kind of detection circuit of infrared detection smokescope according to claim 4, which is characterized in that the processing mould
Block (1) includes the first end connection electricity of the first chip U1, twelfth resistor R12, thirteenth resistor R13, the first chip U1
Source, second end are sequentially connected second amplifying circuit, level-one amplifying circuit and infrared receiving tube, and third end is sequentially connected constant-current circuit
And infrared transmitting tube, the 5th end ground connection, six end connecting twelfth resistor R12 are connected with communicating circuit, the connection of the 7th end later
Communicating circuit is connected with after thirteenth resistor R13.
6. a kind of detection circuit of infrared detection smokescope according to claim 4, which is characterized in that the temperature is mended
Repaying circuit (4) includes first diode D1, first resistor R1, second resistance R2,3rd resistor R3, the 5th resistance R5, and described
One end of one resistance R1 connects to power supply, and the other end is connect with the anode of first diode D1, and the other end is also successively through the second electricity
It is grounded after resistance R2 and 3rd resistor R3, the other end is connect through the 5th resistance R5 with amplifying circuit (5) after second resistance R2, institute
State the cathode ground connection of first diode D1.
7. a kind of detection circuit of infrared detection smokescope according to claim 4, which is characterized in that the amplification electricity
Road (5) includes level-one amplifying circuit (51) and second amplifying circuit (52)；
The level-one amplifying circuit (51) includes the first operational amplifier U3, the 4th resistance R4, the 6th resistance R6, the 7th resistance
R7, first capacitor C1, the first feedback resistance Rf1, the non-inverting input terminal and temperature-compensation circuit of the first operational amplifier U3
Connection, non-inverting input terminal also successively access power supply through the 6th resistance R6 and the 4th resistance R4, and non-inverting input terminal is through the 6th resistance R6
It is also connect later with infrared receiving tube, successively the first feedback resistance Rf1 of parallel connection and first is electric between non-inverting input terminal and output end
Hold C1, inverting input terminal is grounded through the 7th resistance R7, and output end is connect with second amplifying circuit (52)；
The second amplifying circuit (52) includes second operational amplifier U4, the 8th resistance R8, the 9th resistance R9, the second feedback electricity
Rf2 is hindered, the non-inverting input terminal of the second operational amplifier U4 is grounded through the 9th resistance R9, and inverting input terminal is through the 8th resistance R8
It is connect with level-one amplifying circuit (51), the second feedback resistance Rf2 in parallel between inverting input terminal and output end, output end and processing
Module (1) connection.
8. a kind of detection circuit of infrared detection smokescope according to claim 4, which is characterized in that described infrared to connect
Closed tube (2) includes the second light emitting diode D2, the plus earth of the second light emitting diode D2, cathode and amplifying circuit (5)
Connection.
9. a kind of detection circuit of infrared detection smokescope according to claim 4, which is characterized in that the infrared hair
Penetrating pipe (3) includes third light emitting diode D3, and the anode of the third light emitting diode D3 is connect with constant-current circuit (6), cathode
Connect power supply.
10. a kind of detection circuit of infrared detection smokescope, feature described in -9 any one exist according to claim 1
In, further include communicating circuit (7), the communicating circuit (7) includes fifth chip U5, the first end of the fifth chip U5 with
Power supply connection, second end are connect with processing module (1), and third end is connect with processing module (1), the 4th end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821350003.8U CN208888116U (en) | 2018-08-21 | 2018-08-21 | Detection circuit for infrared detection of smoke concentration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821350003.8U CN208888116U (en) | 2018-08-21 | 2018-08-21 | Detection circuit for infrared detection of smoke concentration |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208185A (en) * | 2018-08-21 | 2019-09-06 | 华帝股份有限公司 | Detection circuit for detecting smoke concentration by infrared and detection method thereof |
| CN110243780A (en) * | 2019-07-16 | 2019-09-17 | 国网湖南省电力有限公司 | A kind of Internet of Things type power transformer environment monitoring device |
| CN114018408A (en) * | 2021-11-25 | 2022-02-08 | 上海布鲁可积木科技有限公司 | Infrared ranging compensation-based color identification circuit and modulation method |
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2018
- 2018-08-21 CN CN201821350003.8U patent/CN208888116U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208185A (en) * | 2018-08-21 | 2019-09-06 | 华帝股份有限公司 | Detection circuit for detecting smoke concentration by infrared and detection method thereof |
| CN110243780A (en) * | 2019-07-16 | 2019-09-17 | 国网湖南省电力有限公司 | A kind of Internet of Things type power transformer environment monitoring device |
| CN114018408A (en) * | 2021-11-25 | 2022-02-08 | 上海布鲁可积木科技有限公司 | Infrared ranging compensation-based color identification circuit and modulation method |
| CN114018408B (en) * | 2021-11-25 | 2024-05-28 | 上海布鲁可积木科技有限公司 | Color recognition circuit based on infrared ranging compensation and modulation method |
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