CN105352865B - A kind of PM2.5 sensors and PM2.5 detection methods based on infrared ray photoelectric conversion - Google Patents
A kind of PM2.5 sensors and PM2.5 detection methods based on infrared ray photoelectric conversion Download PDFInfo
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Abstract
The present invention is for a kind of PM2.5 sensors and PM2.5 detection methods based on infrared ray photoelectric conversion.The PM2.5 sensors, including：The 10KHz carrier waves provided according to main control unit produce the radiating circuit of infrared ray；Infrared signal is received respectively and produces the first receiving circuit, the second receiving circuit of the voltage signal of reaction PM2.5 concentration；There is provided 10KHz carrier waves, two-way is reacted PM2.5 concentration voltage signal total null voltage and sensitivity compensate the main control unit that PM2.5 concentration is calculated；The output port of the input connection main control unit of radiating circuit, the output end of the first receiving circuit, the output end of the second receiving circuit connect the different input ports of main control unit respectively.The present invention detects PM2.5 concentration using two identical receiving circuits, reduces error, improves accuracy of detection, and using infrared ray power conversion technology, infrored equipment is simple in construction, small volume, in light weight, price is low.Main control unit has the characteristics of low in energy consumption, versatility is good.
Description
Technical field
The present invention relates to field of embedded technology, and in particular to a kind of PM2.5 sensors based on infrared ray photoelectric conversion
And PM2.5 detection methods.
Background technology
With the prosperity and development of society, the living standard of people is improved constantly, but industrialized deepen continuously is developed but
It has been inevitably generated the Tough questions such as air pollution.Recent years, the air pollution regulations that people are concerned about are mainly PM2.5
Concentration.Nowadays there are many PM2.5 detection devices in the market, and a part of PM2.5 sensors are using gravimetric method, micro vibration day
The methods of flat method test particulate in air, the concentration of dust.Such monitoring method is to the number such as air themperature, humidity, airflow rate
According to precise requirements it is very harsh, little by little deviation can make monitoring result ratio of precision far from each other and measured compared with
Low, cost is but very high.It is unfavorable for popularizing on a large scale, although another part PM2.5 sensors then employ optical method, chemical method
To measure the dust concentration in air, increased in terms of measurement accuracy, but its volume is too big, and price is also higher.In people's day
In the case that benefit pursues high-quality life, people need a kind of PM2.5 sensor devices easy to carry, cost is cheap.
The content of the invention
It is an object of the invention to provide a kind of PM2.5 sensors based on infrared ray photoelectric conversion and PM2.5 detection sides
Method.
The technical scheme is that：
A kind of PM2.5 sensors based on infrared ray photoelectric conversion, including：
The 10KHz carrier waves provided according to main control unit produce the radiating circuit of infrared ray；
Infrared signal is received respectively and produces the first receiving circuit of the voltage signal of reaction PM2.5 concentration, the second reception
Circuit；
There is provided 10KHz carrier waves, two-way is reacted PM2.5 concentration voltage signal total null voltage and sensitivity compensate
The main control unit of PM2.5 concentration is calculated；
The output port of the input connection main control unit of radiating circuit, the output end of the first receiving circuit, second receive
The output end of circuit connects the different input ports of main control unit respectively.
The radiating circuit includes the first photodiode and triode；
The positive pole of first photodiode meets power supply VCC, and the negative pole of the first photodiode is connected to three through a resistance
The colelctor electrode of pole pipe, the grounded emitter of triode, the base stage of triode are connected to the output end of main control unit through another resistance
Mouthful.
First receiving circuit, the second receiving circuit include：
Receive infrared ray caused by radiating circuit, convert optical signals into the photoelectric conversion module of current signal；
The current signal that photoelectric conversion module exports is converted into the Current Voltage modular converter of voltage signal；
The amplification module being amplified to voltage signal；
The filtration module that electric signal caused by photoelectric conversion module sensing infrared ray is filtered out；
Amplification module includes the first amplifier and the second amplifier, the first amplifier and the series connection of the second amplifier；
Current Voltage modular converter includes the first Current Voltage modular converter and the second Current Voltage modular converter；
The anode connection supply voltage of photoelectric conversion module, one end and the opto-electronic conversion mould of the first Current Voltage modular converter
The reverse input end of the first amplifier is accessed after the negative electrode connection of block, one end of the second Current Voltage modular converter is grounded, and second
The other end of Current Voltage modular converter connects the positive input of the first amplifier, and the output end of the first amplifier is put with second
The other end of the first Current Voltage modular converter, the output end of the second amplifier and second are connected between the positive input of big device
The reverse input end connection of amplifier is followed by the input of filtration module.
The main control unit is integrated on one piece of PCB with radiating circuit, the first receiving circuit, the second receiving circuit.
The method for carrying out PM2.5 detections using the PM2.5 sensors based on infrared ray photoelectric conversion, including it is following
Step：
The 10KHz carrier waves that step 1, radiating circuit provide according to main control unit produce infrared ray；
Step 2, the first receiving circuit, the second receiving circuit receive infrared signal and produce reaction PM2.5 concentration respectively
Voltage signal；
Step 3, to two-way reflect PM2.5 concentration voltage signal total null voltage and sensitivity compensate and be calculated
The main control unit of PM2.5 concentration.
Step 2 is carried out as follows：
Step 2.1, receive infrared ray caused by radiating circuit, convert optical signals into current signal；
Step 2.2, by photoelectric conversion module export current signal be converted into voltage signal；
Step 2.3, the amplification module being amplified to voltage signal；
Step 2.4, by photoelectric conversion module sense infrared ray caused by electric signal filter out, that is, filter out noise；
Step 2.5, obtain two-way reaction PM2.5 concentration voltage signal transmit to main control unit.
Step 3 is carried out as follows：
Step 3.1, determine the first receiving circuit output voltage computation model at room temperature, the second receiving circuit in room temperature
Under output voltage computation model；
U0=a0+b0×p
U0'=a0′+b0′×p′
Wherein, U0For the output voltage of the first receiving circuit at room temperature, U0' for the second receiving circuit at room temperature defeated
Go out voltage, the PM2.5 concentration that p measures for the first receiving circuit, the PM2.5 concentration that p ' measures for the second receiving circuit, a0For
The total null voltage of one receiving circuit at room temperature, a0' it is the total null voltage of the second receiving circuit at room temperature, b0Received for first
The sensitivity of circuit at room temperature, b0' it is the sensitivity of the first receiving circuit at room temperature；
Step 3.2, determine the first receiving circuit when temperature is t output voltage computation model, the second receiving circuit in temperature
Spend for t when output voltage computation model；
Ut=at+bt×p
Ut'=at′+bt′×p′
Wherein, UtFor output voltage of first receiving circuit when temperature is t, Ut' for the second receiving circuit in temperature it is t
When output voltage；atFor total null voltage of first receiving circuit when temperature is t, at' for the second receiving circuit in temperature it is t
When total null voltage, btFor sensitivity of first receiving circuit when temperature is t, bt' for the first receiving circuit when temperature is t
Sensitivity；
at=a0+α(t-t0)×Y(FS)
bt=b0+β(t-t0)×Y(FS)
at'=a0′+α′(t-t0)×Y(FS)′
bt'=b0′+β′(t-t0)×Y(FS)′
Wherein, t0Indoor temperature is represented, α and α ' represents that the zero-bit temperature coefficient of the first receiving circuit, second receive respectively
The zero-bit temperature coefficient of circuit, be numerically equal to total null voltage value when temperature changes 1 DEG C knots modification and range Y (FS) it
Than that is,：
α=Δ α/(Δ T × Y (FS))
α '=Δ α '/(Δ T × Y (FS) ')
Δ α and Δ α ' is illustrated respectively in the range of the temperature change of PM2.5 sensors, the zero-bit of the first receiving circuit
Magnitude of voltage maximum change amount, the total null voltage value maximum change amount of the second receiving circuit；Δ T represents the work of PM2.5 sensors
Range of temperature；
β=Δ β/(Δ T × Y (FS))
β '=Δ β '/(Δ T × Y (FS) ')
Δ β and Δ β ' represent respectively the first receiving circuit after temperature change, the second receiving circuit sensitivity variable quantity；
β and β ' represents the sensitivity temperature coefficient of the first receiving circuit, the sensitivity temperature system of the second receiving circuit respectively
Number, be numerically equal to temperature change 1 DEG C when, the ratio between variable quantity and range Y (FS) of sensitivity；
Step 3.3, determine that PM2.5 concentration p computation models, the second receiving circuit that the first receiving circuit measures are measured
PM2.5 concentration p ' computation models；
Step 3.4, the total null voltage a according to the first receiving circuit at room temperature0, the spirit of the first receiving circuit at room temperature
Sensitivity b0, the zero-bit temperature factor alpha of the first receiving circuit, the sensitivity temperature coefficient β of the first receiving circuit, the second receiving circuit
Total null voltage a at room temperature0', the sensitivity b of the second receiving circuit at room temperature0', the zero-bit temperature system of the second receiving circuit
Number α ', the sensitivity temperature coefficient β ' of the second receiving circuit, the first receiving circuit measured when temperature rises to t, second connect
Receive the output voltage U of circuittAnd Ut', calculate the PM2.5 concentration values p and p ' after temperature-compensating；
Step 3.5, final PM2.5 concentration values P obtained using linear interpolation algorithmf, i.e.,：
Beneficial effect：
The present invention detects PM2.5 concentration using two identical receiving circuits, reduces error, improves accuracy of detection,
Using infrared ray power conversion technology, infrored equipment is simple in construction, small volume, in light weight, price is low.Main control unit has work(
Consume the characteristics of low, versatility is good.
Brief description of the drawings
Fig. 1 is the PM2.5 sensor construction block diagrams based on infrared ray photoelectric conversion of the specific embodiment of the invention；
Fig. 2 is the MSP430F1611 of specific embodiment of the invention singlechip minimum system circuit schematic diagram；
Fig. 3 is the radiating circuit schematic diagram of the specific embodiment of the invention；
Fig. 4 is the circuit theory diagrams of the first receiving circuit of the specific embodiment of the invention；
Fig. 5 is the circuit theory diagrams of the second receiving circuit of the specific embodiment of the invention；
Fig. 6 is the first receiving circuit output voltage of the specific embodiment of the invention with the curve map of dust variable density；
Fig. 7 is the second receiving circuit output voltage of the specific embodiment of the invention with the curve map of dust variable density.
Embodiment
The embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
A kind of PM2.5 sensors based on infrared ray photoelectric conversion, as shown in figure 1, including：
The 10KHz carrier waves provided according to main control unit produce the radiating circuit of infrared ray；
Infrared signal is received respectively and produces the first receiving circuit of the voltage signal of reaction PM2.5 concentration, the second reception
Circuit；
There is provided 10KHz carrier waves, two-way is reacted PM2.5 concentration voltage signal total null voltage and sensitivity compensate
The main control unit of PM2.5 concentration is calculated；
Main control unit uses MSP430F1611 single-chip microcomputers, and MSP430F1611 singlechip minimum system circuits are as shown in Figure 2.
MSP430 series monolithics be Texas Instruments (TI) start within 1996 to introduce to the market 16 super low-power consumptions of one kind, there is essence
The mixed-signal processor (Mixed Signal Processor) of simple instruction set (RISC).
The output port of the input connection main control unit of radiating circuit, the output end of the first receiving circuit, second receive
The output end of circuit connects the different input ports of main control unit respectively.
As shown in figure 3, radiating circuit includes the first photodiode D1 and triode Q1；
The negative pole that first photodiode D1 positive pole meets power supply VCC, the first photodiode D1 connects through a resistance R2
Triode Q1 colelctor electrode, triode Q1 grounded emitter are connected to, triode Q1 base stage is connected to master through another resistance R1
Control the output port I/O of unit.
As shown in Figures 4 and 5, the first receiving circuit, the second receiving circuit include：
Receive infrared ray caused by radiating circuit, convert optical signals into the photoelectric conversion module 1 of current signal；
The current signal that photoelectric conversion module exports is converted into the Current Voltage modular converter 2 of voltage signal；
The amplification module 3 being amplified to voltage signal；
The filtration module 4 that electric signal caused by photoelectric conversion module sensing infrared ray is filtered out；
Current Voltage modular converter 2 includes the first Current Voltage modular converter and the second Current Voltage modular converter；First
Electric capacity C7 is in parallel with resistance R7 in Current Voltage modular converter, and electric capacity C6 and resistance R6 be simultaneously in the second Current Voltage modular converter
Join
Amplification module 3 uses LM358 dual operational amplifiers, including the first amplifier and the second amplifier, the first amplifier
Connected with the second amplifier.
Photoelectric conversion module uses photodiode D3, anode connection the supply voltage VCC, electric capacity C7 of photoelectric conversion module
It is connected and is followed by as one end of the first Current Voltage modular converter and the negative electrode of photoelectric conversion module with one end after resistance R7 parallel connections
Enter the reverse input end IN1 (-) of the first amplifier, one end ground connection of the second Current Voltage modular converter, the second Current Voltage turns
The other end for changing the mold block connects the positive input IN1 (+) of the first amplifier, and the output end OUT1 of the first amplifier is put with second
The other end of the first Current Voltage modular converter is connected between the positive input IN2 (+) of big device, and (electric capacity C7 is in parallel with resistance R7
The other end afterwards), the output end OUT2 of the second amplifier is connected with the reverse input end IN2 (-) of the second amplifier and is followed by filter
The input of ripple module.
In filtration module 4, electric capacity C9 one end connection inductance L3 one end, the one of inductance L3 other end connection resistance R8
End, electric capacity C9 other ends connection electric capacity C8 one end, inductance L4 one end are connected between inductance L3 and resistance R8, electric capacity C10's
One end is connected between inductance L4 and resistance R8, the resistance R8 other end, the inductance L4 other end, electric capacity the C10 other end, electricity
It is grounded again after holding C8 other end connection.
Main control unit is integrated on one piece of PCB with radiating circuit, the first receiving circuit, the second receiving circuit.
The method for carrying out PM2.5 detections using the PM2.5 sensors based on infrared ray photoelectric conversion, including it is following
Step：
The 10KHz carrier waves that step 1, radiating circuit provide according to main control unit produce infrared ray；
Step 2, the first receiving circuit, the second receiving circuit receive infrared signal and produce reaction PM2.5 concentration respectively
Voltage signal；
Step 2.1, receive infrared ray caused by radiating circuit, convert optical signals into current signal；
Step 2.2, by photoelectric conversion module export current signal be converted into voltage signal；
Step 2.3, the amplification module being amplified to voltage signal；
Step 2.4, by photoelectric conversion module sense infrared ray caused by electric signal filter out, that is, filter out noise；
Step 2.5, obtain two-way reaction PM2.5 concentration voltage signal transmit to main control unit.
Step 3, to two-way reflect PM2.5 concentration voltage signal total null voltage and sensitivity compensate and be calculated
The main control unit of PM2.5 concentration.
Step 3.1, determine the first receiving circuit output voltage computation model at room temperature, the second receiving circuit in room temperature
Under output voltage computation model；
U0=a0+b0×p
U0'=a0′+b0′×p′
Wherein, U0For the output voltage of the first receiving circuit at room temperature, U0' for the second receiving circuit at room temperature defeated
Go out voltage, the PM2.5 concentration that p measures for the first receiving circuit, the PM2.5 concentration that p ' measures for the second receiving circuit, a0For
The total null voltage of one receiving circuit at room temperature, a0' it is the total null voltage of the second receiving circuit at room temperature, b0Received for first
The sensitivity of circuit at room temperature, b0' it is the sensitivity of the first receiving circuit at room temperature；
Step 3.2, determine that output voltage computation model of first receiving circuit when temperature is t, the second receiving circuit exist
Output voltage computation model when temperature is t；
Ut=at+bt×p
Ut'=at′+bt′×p′
Wherein, UtFor output voltage of first receiving circuit when temperature is t, Ut' for the second receiving circuit in temperature it is t
When output voltage；atFor total null voltage of first receiving circuit when temperature is t, at' for the second receiving circuit in temperature it is t
When total null voltage, btFor sensitivity of first receiving circuit when temperature is t, bt' for the first receiving circuit when temperature is t
Sensitivity；
at=a0+α(t-t0)×Y(FS)
bt=b0+β(t-t0)×Y(FS)
at'=a0′+α′(t-t0)×Y(FS)′
bt'=b0′+β′(t-t0)×Y(FS)′
Wherein, t0Indoor temperature is represented, α and α ' represents that the zero-bit temperature coefficient of the first receiving circuit, second receive respectively
The zero-bit temperature coefficient of circuit, the ratio between the knots modification of total null voltage value and range when temperature changes 1 DEG C are numerically equal to, i.e.,：
α=Δ α/(Δ T × Y (FS))
α '=Δ α '/(Δ T × Y (FS) ')
Wherein, Δ α and Δ α ' is illustrated respectively in the range of the temperature change of PM2.5 sensors, the first receiving circuit
Total null voltage value maximum change amount, the zero value maximum change amount of the second receiving circuit；Δ T represents the work of PM2.5 sensors
Make range of temperature, Y (FS), Y (FS) ' represent the range of the first receiving circuit, the range of the second receiving circuit respectively；
β=Δ β/(Δ T × Y (FS))
β '=Δ β '/(Δ T × Y (FS) ')
Wherein, Δ β and Δ β ' represent the variable quantity of the sensitivity of the first receiving circuit, the second reception after temperature change respectively
The variable quantity of the sensitivity of circuit；
β and β ' represents the sensitivity temperature coefficient of the first receiving circuit, the sensitivity temperature system of the second receiving circuit respectively
Number, be numerically equal to temperature change 1 DEG C when, the ratio between variable quantity and range of sensitivity；
Step 3.3, determine that PM2.5 concentration p computation models, the second receiving circuit that the first receiving circuit measures are measured
PM2.5 concentration p ' computation models；
Step 3.4, the total null voltage a according to the first receiving circuit at room temperature0, the spirit of the first receiving circuit at room temperature
Sensitivity b0, the zero-bit temperature factor alpha of the first receiving circuit, the sensitivity temperature coefficient β of the first receiving circuit, second receives electricity
The total null voltage a of road at room temperature0', the sensitivity b of the second receiving circuit at room temperature0', the zero-bit temperature of the second receiving circuit
Factor alpha ', the sensitivity temperature coefficient β ' of the second receiving circuit, the output of the first receiving circuit measured when temperature rises to t
Voltage Ut, the second receiving circuit output voltage Ut', calculate the PM2.5 concentration values p and p ' after temperature-compensating；
Step 3.5, final PM2.5 concentration values P obtained using linear interpolation algorithmf, i.e.,：
Shown in Fig. 6 is curve map of the first receiving circuit output voltage with dust variable density, and shown in Fig. 7 is second to connect
Receive curve map of the circuit output voltage with dust variable density.According to the principle of reflection of light, particulate in air is more, reflexes to light
Infrared ray on electric diode D3 is more, and then the electric current of photodiode output is bigger, the processing through oversampling circuit, its output voltage
It is bigger.The way of output uses serial mode, and serial ports output is after communication is changed, i.e., according to formula：
WithComputing obtains p and p ' value, further according toIt can obtain final
PM2.5 concentration value.
Experiment test：
After tested, at room temperature, the data such as following table of the output voltage of two resulting receiving circuits and dust concentration：
The output voltage of the receiving circuit of table 1 first and the data of dust concentration
| Dust concentration (mg/m3) | Output voltage (V) |
| 0 | 0.58 |
| 0.1 | 1.28 |
| 0.2 | 1.75 |
| 0.3 | 2.29 |
| 0.4 | 2.99 |
| 0.5 | 3.5 |
| 0.6 | 3.6 |
| 0.7 | 3.7 |
| 0.8 | 3.7 |
| 0.9 | 3.7 |
| 1.0 | 3.7 |
The output voltage of the receiving circuit of table 2 second and the data of dust concentration
| Dust concentration (mg/m3) | Output voltage (V) |
| 0 | 0.56 |
| 0.1 | 1.11 |
| 0.2 | 1.74 |
| 0.3 | 2.34 |
| 0.4 | 2.97 |
| 0.5 | 3.64 |
| 0.6 | 3.84 |
| 0.7 | 3.85 |
| 0.8 | 3.85 |
| 0.9 | 3.85 |
| 1.0 | 3.85 |
Data in table 1, table 2 are fitted to obtain curve as shown in Figure 6,7 through neutral net.
The total null voltage of two receiving circuits at different temperatures and sensitivity such as following table in actual test：
The receiving circuit of table 3 first total null voltage at different temperatures and sensitivity data
| Temperature t (DEG C) | Total null voltage at(v) | Sensitivity bt |
| 27 | 0.580 | 5.74 |
| 50 | 0.693 | 5.97 |
| 70 (maximums) | 0.795 | 6.17 |
It can obtain by table 1 and form 3：
a0=0.58V,
Range Y (FS)=3.7-0.58=3.12V of first receiving circuit
α=Δ α/(Δ T × Y (FS))=(0.795-0.580)/(43 × 3.12)=0.0016
β=Δ β/(Δ T × Y (FS))=(6.17-5.74)/(43 × 3.12)=0.0032
Therefore, the PM2.5 concentration that the first receiving circuit is measured is obtained：
The receiving circuit of table 4 second total null voltage at different temperatures and sensitivity data
| Temperature t (DEG C) | Total null voltage at′(v) | Sensitivity bt′ |
| 27 | 0.560 | 6.14 |
| 50 | 0.682 | 5.43 |
| 70 (maximums) | 0.780 | 6.64 |
It can obtain by table 2 and table 4：
a0'=0.56V
Range Y (FS) '=3.85-0.56=3.29V of second receiving circuit
α '=Δ α '/(Δ T × Y (FS) ')=(0.780-0.560)/(43 × 3.29)=0.0016
β '=Δ β '/(Δ T × Y (FS) ')=(6.64-6.14)/(43 × 3.29)=0.0035
Therefore, the PM2.5 concentration that the second receiving circuit is measured is obtained：
Claims (2)
1. a kind of PM2.5 detection methods, using a kind of PM2.5 sensors based on infrared ray photoelectric conversion, including：
The 10KHz carrier waves provided according to main control unit produce the radiating circuit of infrared ray；
Infrared signal is received respectively and produces the first receiving circuit, the second receiving circuit of the voltage signal of reaction PM2.5 concentration；
There is provided 10KHz carrier waves, two-way is reacted PM2.5 concentration voltage signal total null voltage and sensitivity compensate calculating
Obtain the main control unit of PM2.5 concentration；
The output port of the input connection main control unit of radiating circuit, the output end of the first receiving circuit, the second receiving circuit
Output end connect the different input ports of main control unit respectively；
This method comprises the following steps：
The 10KHz carrier waves that step 1, radiating circuit provide according to main control unit produce infrared ray；
Step 2, the first receiving circuit, the second receiving circuit receive infrared signal and produce the voltage of reaction PM2.5 concentration respectively
Signal；
Step 3, main control unit reflect that the total null voltage of the voltage signal of PM2.5 concentration and sensitivity compensate calculating to two-way
Obtain PM2.5 concentration；
Characterized in that, step 3 is carried out as follows：
Step 3.1, determine the first receiving circuit output voltage computation model at room temperature, the second receiving circuit at room temperature
Output voltage computation model；
U0=a0+b0×p
U0'=a0′+b0′×p′
Wherein, U0For the output voltage of the first receiving circuit at room temperature, U0' output the electricity for the second receiving circuit at room temperature
Pressure, the PM2.5 concentration that p measures for the first receiving circuit, the PM2.5 concentration that p ' measures for the second receiving circuit, a0Connect for first
Receive the total null voltage of circuit at room temperature, a0' it is the total null voltage of the second receiving circuit at room temperature, b0For the first receiving circuit
Sensitivity at room temperature, b0' it is the sensitivity of the second receiving circuit at room temperature；
Step 3.2, determine output voltage computation model of first receiving circuit when temperature is t, the second receiving circuit in temperature
For t when output voltage computation model；
Ut=at+bt×p
Ut'=at′+bt′×p′
Wherein, UtFor output voltage of first receiving circuit when temperature is t, Ut' it is the second receiving circuit when temperature is t
Output voltage；atFor total null voltage of first receiving circuit when temperature is t, at' it is the second receiving circuit when temperature is t
Total null voltage, btFor sensitivity of first receiving circuit when temperature is t, bt' it is spirit of second receiving circuit when temperature is t
Sensitivity；
at=a0+α(t-t0)×Y(FS)
bt=b0+β(t-t0)×Y(FS)
at'=a0′+α′(t-t0)×Y(FS)′
bt'=b0′+β′(t-t0)×Y(FS)′
Wherein, t0Represent indoor temperature, α and α ' represent the zero-bit temperature coefficient of the first receiving circuit, the second receiving circuit respectively
Zero-bit temperature coefficient, the ratio between the knots modification of total null voltage value and range when temperature changes 1 DEG C are numerically equal to, i.e.,：
α=Δ α/(Δ T × Y (FS))
α '=Δ α/(Δ T × Y (FS) ')
Wherein, Δ α and Δ α ' is illustrated respectively in the range of the temperature change of PM2.5 sensors, and the zero of the first receiving circuit
Position magnitude of voltage maximum change amount, the zero value maximum change amount of the second receiving circuit；Δ T represents the work temperature of PM2.5 sensors
Excursion is spent, Y (FS), Y (FS) ' represent the range of the first receiving circuit, the range of the second receiving circuit respectively；
β=Δ β/(Δ T × Y (FS))
β '=Δ β '/(Δ T × Y (FS) ')
Wherein, Δ β and Δ β ' represent respectively the first receiving circuit after temperature change, the second receiving circuit sensitivity change
Amount；
β and β ' represents the sensitivity temperature coefficient of the first receiving circuit, the sensitivity temperature coefficient of the second receiving circuit respectively,
When numerically equal to temperature changes 1 DEG C, the ratio between variable quantity and range of sensitivity；
Step 3.3, determine the PM2.5 that PM2.5 concentration p computation models, the second receiving circuit that the first receiving circuit measures are measured
Concentration p ' computation models；
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<mo>)</mo>
</mrow>
<mo>&times;</mo>
<mi>Y</mi>
<msup>
<mrow>
<mo>(</mo>
<mi>F</mi>
<mi>S</mi>
<mo>)</mo>
</mrow>
<mo>&prime;</mo>
</msup>
<mo>&rsqb;</mo>
</mrow>
<mrow>
<msup>
<msub>
<mi>b</mi>
<mn>0</mn>
</msub>
<mo>&prime;</mo>
</msup>
<mo>+</mo>
<msup>
<mi>&beta;</mi>
<mo>&prime;</mo>
</msup>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mo>&times;</mo>
<mi>Y</mi>
<msup>
<mrow>
<mo>(</mo>
<mi>F</mi>
<mi>S</mi>
<mo>)</mo>
</mrow>
<mo>&prime;</mo>
</msup>
</mrow>
</mfrac>
</mrow>
Step 3.4, the total null voltage a according to the first receiving circuit at room temperature0, the sensitivity of the first receiving circuit at room temperature
b0, the zero-bit temperature factor alpha of the first receiving circuit, the sensitivity temperature coefficient β of the first receiving circuit, the second receiving circuit is in room
Total null voltage a under temperature0', the sensitivity b of the second receiving circuit at room temperature0', the zero-bit temperature coefficient of the second receiving circuit
α ', the second receiving circuit sensitivity temperature coefficient β ', the output voltage of the first receiving circuit measured when temperature rises to t
Ut, the second receiving circuit output voltage Ut', calculate the PM2.5 concentration values p and p ' after temperature-compensating；
Step 3.5, final PM2.5 concentration values P obtained using linear interpolation algorithmf, i.e.,：
<mrow>
<msub>
<mi>P</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>p</mi>
<mo>+</mo>
<msup>
<mi>p</mi>
<mo>&prime;</mo>
</msup>
</mrow>
<mn>2</mn>
</mfrac>
<mo>.</mo>
</mrow>
2. PM2.5 detection methods according to claim 1, it is characterised in that step 2 is carried out as follows：
Step 2.1, receive infrared ray caused by radiating circuit, convert optical signals into current signal；
Step 2.2, by photoelectric conversion module export current signal be converted into voltage signal；
Step 2.3, voltage signal is amplified；
Step 2.4, by photoelectric conversion module sense infrared ray caused by electric signal filter out, that is, filter out noise；
Step 2.5, obtain two-way reaction PM2.5 concentration voltage signal transmit to main control unit.
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| CN109011862A (en) * | 2018-07-05 | 2018-12-18 | 杨柳锋 | A kind of indoor formaldehyde detection processing device |
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