CN103592348A - Portable quick indoor air quality detector - Google Patents
Portable quick indoor air quality detector Download PDFInfo
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- CN103592348A CN103592348A CN201310587485.4A CN201310587485A CN103592348A CN 103592348 A CN103592348 A CN 103592348A CN 201310587485 A CN201310587485 A CN 201310587485A CN 103592348 A CN103592348 A CN 103592348A
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Abstract
The invention provides a portable quick indoor air quality detector which comprises an HCHO (formaldehyde) sensor module, a first current and voltage conversion circuit, a first low-pass filtration and amplification circuit, an NH3 sensor module, a second current and voltage conversion circuit, a second low-pass filtration and amplification circuit, a C6H6 sensor module, a third current and voltage conversion circuit, a third low-pass filtration and amplification circuit, a VOC (volatile organic compound) sensor module and a fourth low-pass filtration and amplification circuit, wherein the NH3 sensor module, the second current and voltage conversion circuit and the second low-pass filtration and amplification circuit are sequentially connected; the C6H6 sensor module, the third current and voltage conversion circuit and the third low-pass filtration and amplification circuit are sequentially connected; the VOC sensor module and the fourth low-pass filtration and amplification circuit are sequentially connected; the first low-pass filtration and amplification circuit, the second low-pass filtration and amplification circuit, the third low-pass filtration and amplification circuit and the fourth low-pass filtration and amplification circuit are connected with an A/D (analog/digital) conversion circuit, respectively; and the A/D conversion circuit is connected with an FPGA (field programmable gate A) processor. The quick detector further comprises a power supply module. The quick detector has the advantages of high detection speed and measuring precision, convenience in carrying and the like, and provides a simple and reliable method and means for monitoring indoor air quality of common public families quickly and accurately in real time.
Description
Technical field
The invention belongs to Indoor Environment Detection technical field, relate to a kind of detector of fast detecting IAQ (indoor air quality), be specifically related to a kind of Portable type room air quality fast detector.
Background technology
Raising day by day along with living standard, people also more and more pay attention to IAQ (indoor air quality) situation, in existing various building materials, all contain a certain amount of objectionable impurities, people often judge the situation of IAQ (indoor air quality) by sense of smell, so both jeopardize the health of oneself, be secondly also difficult to the accurately quality of judgement IAQ (indoor air quality).Because the air quality accidents such as leukaemia that cause not up to standard happen occasionally, therefore in the urgent need to finding a kind of equipment that simply, fast, accurately detects IAQ (indoor air quality).In the checkout equipment using at present, the measuring error of some equipment is larger, and some equipment does not reach testing requirement, and some equipment is had relatively high expectations to operating personnel and professional knowledge, makes existing checkout equipment all be difficult to spread to numerous average families.Therefore, invent a kind of simple to operate, easy to carry, to detect fast and accurately air quality detector be in good time and necessary.
Summary of the invention
The object of this invention is to provide a kind of simple to operate, detect Portable type room air quality fast detector fast and accurately, be applicable to average family IAQ (indoor air quality) and detect.
For achieving the above object, the technical solution adopted in the present invention is: a kind of Portable type room air quality fast detector, comprises the HCHO sensor assembly, the first current-to-voltage converting circuit and the first low-pass filtering amplifying circuit that are connected successively; The NH being connected successively
3sensor assembly, the second current-to-voltage converting circuit and the second low-pass filtering amplifying circuit; The C being connected successively
6h
6sensor assembly, the 3rd current-to-voltage converting circuit and the 3rd low-pass filtering amplifying circuit; The VOC sensor assembly being connected successively and the 4th low-pass filtering amplifying circuit; The first low-pass filtering amplifying circuit, the second low-pass filtering amplifying circuit, the 3rd low-pass filtering amplifying circuit and the 4th low-pass filtering amplifying circuit are connected with A/D change-over circuit respectively, and A/D change-over circuit is connected with FPGA processor; This fast detector also comprises power module.
IAQ (indoor air quality) fast detector of the present invention is mainly used in the fast detecting of indoor formaldehyde concentration, ammonia concentration, benzene concentration and volatile organic matter concentration, and by the monitoring correction detected value to ambient temperature and humidity, greatly improve the accuracy of measuring, the fast simple detecting instrument in a kind of comparatively desirable scene, for IAQ (indoor air quality) fast detecting portability provides larger possibility.
Accompanying drawing explanation
Fig. 1 is the structural representation of fast detector of the present invention.
Fig. 2 is the electrical block diagram of fast detector of the present invention.
Fig. 3 is the function module design figure of fast detector of the present invention.
Fig. 4 is the power module design drawing of fast detector of the present invention.
Fig. 5 is the panel designs figure of fast detector of the present invention.
In Fig. 1: 1.HCHO sensor assembly, 2.NH
3sensor assembly, 3.C
6h
6sensor assembly, 4.VOC sensor assembly, 5. the 3rd current-to-voltage converting circuit, 6. the 4th low-pass filtering amplifying circuit, 7. the 3rd low-pass filtering amplifying circuit, 8.A/D change-over circuit, 9.FPGA processor, 10.USB interface, 11. function buttons, 12. power modules, 13. humiture detection modules, 14. liquid crystal and pilot lamp show, 15. second low-pass filtering amplifying circuits, 16. first low-pass filtering amplifying circuits, 17. second current-to-voltage converting circuits, 18. first current-to-voltage converting circuits.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, fast detector of the present invention, comprises the HCHO sensor assembly 1, the first current-to-voltage converting circuit 18 and the first low-pass filtering amplifying circuit 16 that are connected successively; The NH being connected successively
3sensor assembly 2, the second current-to-voltage converting circuit 17 and the second low-pass filtering amplifying circuit 15; The C being connected successively
6h
6sensor assembly 3, the 3rd current-to-voltage converting circuit 5 and the 3rd low-pass filtering amplifying circuit 7; The VOC sensor assembly 4 being connected successively and the 4th low-pass filtering amplifying circuit 6; The first low-pass filtering amplifying circuit 16, the second low-pass filtering amplifying circuit 15, the 3rd low-pass filtering amplifying circuit 7 are connected with A/D change-over circuit 8 respectively with the 4th low-pass filtering amplifying circuit 6, and A/D change-over circuit 8 is connected with FPGA processor 9; FPGA processor 9 also shows that with usb 10, function button 11, humiture detection module 13 and liquid crystal and pilot lamp 14 are connected respectively.This fast detector also comprises power module 12, and power module 12 is given each unit power supply in detector.
HCHO sensor assembly 1(formaldehyde sensor module) the electrochemical sensor CH being produced by Membrapor company
2o/S-10-S and formaldehyde sensor interface circuit form.NH
3sensor assembly 2(ammoniacal sensor module) the electrochemical sensor ME3-NH being produced by Winsensor company
3form with ammoniacal sensor interface circuit; C
6h
6sensor assembly 3(benzene sensor assembly) the electrochemical sensor ME4-C being produced by Winsensor company
6h
6form with benzene sensor interface circuitry.
The structure of formaldehyde sensor interface circuit, ammoniacal sensor interface circuit and benzene sensor interface circuitry is identical.And, electrochemical sensor CH
2o/S-10-S, electrochemical sensor ME3-NH
3and electrochemical sensor ME4-C
6h
6the title of electrode with to represent symbol also identical.Below with galvanochemistry formaldehyde sensor CH
2o/S-10-S and sensor interface circuitry are example, and the structure of sensor assembly is described.
HCHO sensor assembly 1 comprises formaldehyde sensor and formaldehyde sensor interface circuit, and as shown in Figure 2, formaldehyde sensor interface circuit comprises the first operational amplifier IC1 and field effect transistor Q.Formaldehyde sensor adopts electrochemical sensor CH
2o/S-10-S, formaldehyde sensor electrode CE is connected with the output terminal of the first operational amplifier IC1 with one end of the first capacitor C 1, one end of the second capacitor C 2 respectively; The contrast electrode RE of formaldehyde sensor is connected with the source electrode of field effect transistor Q with one end of the first resistance R 1 respectively, the drain electrode of field effect transistor Q meets the working electrode SE of formaldehyde sensor, the grid of field effect transistor Q is connected with one end of the 4th resistance R 4, another termination+5V voltage of the 4th resistance R 4.The other end of the first resistance R 1 is connected with the other end of the first capacitor C 1 with one end of the second resistance R 2 respectively, and the other end of the second resistance R 2 connects respectively the other end of the second capacitor C 2 and the inverting input of the first operational amplifier IC1; The normal phase input end of the first operational amplifier IC1 connects one end of the 3rd resistance R 3, the other end ground connection of the 3rd resistance R 3.The working electrode SE of formaldehyde sensor is connected with the first current-to-voltage converting circuit 5.The first select ± 5V of operational amplifier IC1 power voltage supply.The first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first capacitor C 1, the second capacitor C 2 and the first operational amplifier IC1 have formed potentiostat circuit, field effect transistor Q is in order to make sensor in preliminary work state, when down circuitry, the source electrode of field effect transistor Q and drain electrode short circuit, so working electrode SE and the contrast electrode RE short circuit of sensor, prevent that sensor is long start-up time, the in the situation that of system cut-off, guarantee that the contrast electrode RE of sensor and working electrode SE short circuit are to keep the electromotive force of these two electrodes to equate.
The first current-to-voltage converting circuit 18, the second current-to-voltage converting circuit 17 are identical with the structure of the 3rd current-to-voltage converting circuit 5, are example below with the 3rd current-to-voltage converting circuit 5:
The first current-to-voltage converting circuit 18 comprises the second operational amplifier IC2 and the 3rd operational amplifier IC3, sees Fig. 2, the second operational amplifier IC2 and the 3rd all select ± 5V of operational amplifier power voltage supply.The normal phase input end of the second operational amplifier IC2 is connected with one end of the 6th resistance R 6 with one end of the 5th resistance R 5 respectively, the working electrode SE of another termination formaldehyde sensor of the 5th resistance R 5.The other end of the 6th resistance R 6 is connected with one end of one end of the second potentiometer R8, the moving contact of the second potentiometer R8 and the first potentiometer R7 respectively; The other end difference ground connection of the second potentiometer R8 and one end of the 15 resistance R 15, the normal phase input end of another termination the 3rd operational amplifier IC3 of the 15 resistance R 15; The inverting input of the 3rd operational amplifier IC3 is connected with one end of the 17 resistance R 17 with one end of the 16 resistance R 16 respectively; The moving contact of the other end of the other end of the 17 resistance R 17, the first potentiometer R7 and the first potentiometer R7 connects respectively the output terminal of the 3rd operational amplifier IC3, and the output terminal of the 3rd operational amplifier IC3 is connected with the first low-pass filtering amplifying circuit 16; The other end of the 16 resistance R 16 is connected with the output terminal of the second operational amplifier IC2 with one end of the 14 resistance R 14 respectively, and the inverting input of the second operational amplifier IC2 is connected with one end of the 9th resistance R 9 with one end of the 14 resistance R 14 other ends, the tenth resistance R 10 respectively; The other end ground connection of the 9th resistance R 9, the moving contact of another termination the 3rd potentiometer R11 of the tenth resistance R 10, one end of termination the 12 resistance R 12 of the 3rd potentiometer R11, another termination+2.5V voltage of the 12 resistance R 12; One end of another termination the 13 resistance R 13 of the 3rd potentiometer R11, another termination-2.5V voltage of the 13 resistance R 13.
The first low-pass filtering amplifying circuit 16 comprises four-operational amplifier IC4, select ± 5V of four-operational amplifier IC4 power voltage supply.The normal phase input end of four-operational amplifier IC4 is connected with one end of the 20 resistance R 20, the other end ground connection of the 20 resistance R 20; The inverting input of four-operational amplifier IC4 is connected with one end of the 4th capacitor C 4 with one end of the 19 resistance R 19 respectively, the other end of the 19 resistance R 19 is connected with one end of one end of the 18 resistance R 18, one end of the 3rd capacitor C 3 and the 4th potentiometer R21 respectively, the other end ground connection of the 3rd capacitor C 3, the other end of the 18 resistance R 18 is connected with the output terminal of the 3rd operational amplifier IC3; The moving contact of the other end of the 4th potentiometer R21, the 4th potentiometer R21, the 4th other end of capacitor C 4 and the output terminal of four-operational amplifier IC4 are connected with one end of the 22 resistance R 22 respectively, another termination A/D change-over circuit 8 of the 22 resistance R 22.
HCHO sensor assembly 1, NH
3sensor assembly 2 and C
6h
6the output of sensor assembly 3 is low current signal, all connects a current-to-voltage converting circuit after each sensor assembly.The current signal of sensor assembly input current voltage conversion circuit enters the normal phase input end of operational amplifier by the 5th resistance R 5; The 5th resistance R 5, the 9th resistance R 9 and the 14 resistance R 14 and the second operational amplifier IC2 form first order circuit; The tenth R10, the 3rd potentiometer R11, the 12 resistance R 12 and the 13 resistance R 13 form the inverting input that offset voltage regulating circuit is connected to the second operational amplifier IC2; The 15 resistance R the 15, the 16 resistance R 16 and the 17 resistance R 17 and the 3rd operational amplifier IC3 form second level circuit; This first order circuit with second level circuit by input signal being connected with output signal with the T-shaped feedback resistive network that the second potentiometer R8 forms by the 6th resistance R 6, the first potentiometer R7, wherein meet the resistance of the 6th resistance R 6 much larger than the resistance of the first potentiometer R7, the resistance of the first potentiometer R7 is more than or equal to the resistance of the second potentiometer R8, the feedback resistance R of this current-to-voltage converting circuit
f≈ R6 * (1+R7/R8).When R6 mono-regularly, by regulating the conversion gain that the ratio of R7 and R8 can fine-adjusting current voltage conversion circuit, the transformational relation of this current-to-voltage converting circuit is V
o=R
f* I.The Main Function of low-pass filtering amplifying circuit is the signal to noise ratio (S/N ratio) that improves circuit, by regulating the 3rd potentiometer R11 can change the offset voltage of current-to-voltage converting circuit, make output voltage between 0V ~ 5V, while making to be input as zero, the output of current-to-voltage converting circuit is also zero; Due to HCHO sensor assembly 1, NH
3sensor assembly 2 and C
6h
6the range of current of sensor assembly 3 output is different, can be consistent by regulating the magnitude relationship of the 6th resistance R 6, the first potentiometer R7 and the second potentiometer R8 to realize the output voltage range of current-to-voltage converting circuit.
The voltage signal obtaining after current-to-voltage converting circuit conversion enters low-pass filtering amplifying circuit, the first low-pass filtering amplifying circuit 16, the second low-pass filtering amplifying circuit 15 and the 3rd low-pass filtering amplifying circuit 7 all adopt the anti-phase amplification active low-pass filter of second order, by regulating the 4th potentiometer R21 can change enlargement factor.
VOC sensor assembly 4(volatile organic matter module) select piD-TECH plus sensor, the supply voltage of this sensor to be+5V, the voltage signal of output 0V ~ 2.5V.The output terminal OUT of this sensor is connected with the 4th low-pass filtering amplifying circuit 7, and the 4th low-pass filtering amplifying circuit 7 adopts the second order positive that has both amplification and low-pass filtering function to amplify active low-pass filter amplifying circuit.As shown in Figure 2, the 4th low-pass filtering amplifying circuit 7 comprises the 5th operational amplifier IC5, the 5th select ± 5V of operational amplifier IC5 power voltage supply.The normal phase input end of the 5th operational amplifier IC5 is connected with one end of the 24 resistance R 24 with one end of the 7th capacitor C 7 respectively, the other end of the 24 resistance R 24 is connected with one end of the 23 resistance R 23 with one end of the 6th capacitor C 6 respectively, the output terminal OUT of another termination piD-TECH plus sensor of the 23 resistance R 23; The other end of the 7th capacitor C 7 respectively with the other end of the 6th capacitor C 6, one end of the 5th capacitor C 5 with ground be connected, the input end VCC of another termination piD-TECH plus sensor of the 5th capacitor C 5; The GND end ground connection of piD-TECH plus sensor; The inverting input of the 5th operational amplifier IC5 is connected with one end of the 26 resistance R 26 with one end of the 25 resistance R 25 respectively, the other end ground connection of the 25 resistance R 25, the output terminal of the other end of the 26 resistance R 26 and the 5th operational amplifier IC5 is connected with one end of the 27 resistance R 27 respectively, and the other end of the 27 resistance R 27 is connected with A/D change-over circuit 8.
VOC sensor supply voltage is+5V, be output as the voltage signal of 0V ~ 2.5V, output terminal connects the 4th low-pass filtering amplifying circuit 6, the 4th low-pass filtering amplifying circuit 6 has both amplification and low-pass filtering function, its enlargement factor A=1+R26/R25, here get R25=R26, enlargement factor is 2 like this, and the voltage range that second order positive amplifies the output of active low-pass filter amplifying circuit is 0V～5V.
Jing Si road low-pass filtering amplifying circuit is processed and is obtained Si road voltage signal input A/D change-over circuit 8, A/D change-over circuit 8 adopts four-way analog to digital converter AD7856-2, this analog to digital converter is controlled and is communicated by letter by FPGA processor 9, and analog to digital converter is transported to data in FPGA processor 9, to carry out subsequent treatment.
The field programmable gate array EP2C5T144C8 of FPGA processor adopting ALTERA company, comprise that with its common functional module forming controlling LCD MODULE LCD240128 carries out the demonstration of four kinds of content of material and ambient temperature and humidity, whether control indicating lamp module utilizes four kinds of content of material of diode displaying to exceed standard, accept the printing key of key-press module input, options button and acknowledgement key function information, the humiture that the temperature and humidity measurement module that control consists of AM2302 is carried out indoor environment detects, the USB interface that control consists of SL811HST prints output, as shown in Figure 3.
HCHO sensor assembly 1 in fast detector of the present invention, NH
3sensor assembly and C
6h
6sensor assembly output current signal, this current signal converts voltage signal to through current-to-voltage converting circuit, then obtains through low-pass filtering amplifying circuit and analog to digital conversion circuit the digital signal that need detect gas concentration.The voltage signal of VOC sensor assembly 4 outputs obtains the digital signal of VOC concentration through the 4th low-pass filtering amplifying circuit 6 and analog to digital conversion; Humiture detection module 13 detects ambient temperature value and wet value degree, and the ambient temperature value that FPGA processor 9 records according to humiture detection module 13 and humidity value are revised and be presented on liquid crystal display to the numerical value of these four kinds of content of material; Revised numerical value and national standard content value compare and show normal or the situation that exceeds standard by pilot lamp.Three buttons are set for selecting measurand and printing being set on the panel of this fast detector, as shown in Figure 5, in this panel, also comprise liquid crystal display piece, four pilot lamp, three function buttons and a USB interface, usb 10 is for output print result.
After fast detector of the present invention powers on, in LCDs, inquiry selects to need the object of test, can select to be arbitrarily no less than a kind of measurand, after choosing, press acknowledgement key, instrument starts to detect the humiture value of current environment and the content of measurand, while is in the temperature and humidity value of liquid crystal display screen display current environment, and according to humiture value, the content of the measured matter under current environment is revised and shown in LCDs, four pilot lamp compare according to indoor environment national standard content limit value default in the current revised content value of measurand and program, if work as pre-test revised content value, exceed limit value, pilot lamp becomes redness, if do not exceeded, be green, if not selecting this material measures, corresponding pilot lamp does not show.In instrument use procedure, by USB interface, connect mini-printer, after pressing printing key, can print current each content of material measuring, the humiture value of current environment and the limit value of national standard.During working sensor, potentiostat circuit performance autoregulation.
FPGA accepts printing key, options button and the acknowledgement key function information of key-press module input, options button is used for selecting measurand, acknowledgement key is used for confirming selected measurand information, and printing key is used for controlling print sensor and measures also corrected concentration value, national normal value and current humiture value; The humiture that the temperature and humidity measurement module that FPGA control consists of AM2302 device is carried out indoor environment detects, and the concentration value detecting for revising sensor improves measuring accuracy.FPGA controls the output that the USB interface consisting of SL811HST prints data.
This instrument panel design as shown in Figure 5, comprises liquid crystal display piece, four pilot lamp, three function buttons and a USB interface.
Fast detector of the present invention can quick and precisely effectively be measured formaldehyde in indoor air (HCHO), ammonia (NH
3), benzene (C
6h
6) and the content of volatile organic matter (VOC), by detecting the humiture value of indoor environment, again revise measured value, make measured value more accurate, by liquid crystal display, show numerical value and whether these four kinds of content of material are exceeded standard and carry out pilot lamp sign, and possessing USB interface and can be connected with mini-printer the measured information obtaining of instrument that prints.
Claims (8)
1. a Portable type room air quality fast detector, is characterized in that, comprises the HCHO sensor assembly (1), the first current-to-voltage converting circuit (18) and the first low-pass filtering amplifying circuit (16) that are connected successively; The NH being connected successively
3sensor assembly (2), the second current-to-voltage converting circuit (17) and the second low-pass filtering amplifying circuit (15); The C being connected successively
6h
6sensor assembly (3), the 3rd current-to-voltage converting circuit (5) and the 3rd low-pass filtering amplifying circuit (7); The VOC sensor assembly (4) being connected successively and the 4th low-pass filtering amplifying circuit (6); The first low-pass filtering amplifying circuit (16), the second low-pass filtering amplifying circuit (15), the 3rd low-pass filtering amplifying circuit (7) and the 4th low-pass filtering amplifying circuit (6) are connected with A/D change-over circuit (8) respectively, and A/D change-over circuit (8) is connected with FPGA processor (9); This fast detector also comprises power module (12).
2. Portable type room air quality fast detector according to claim 1, is characterized in that, described HCHO sensor assembly (1) is by electrochemical sensor CH
2o/S-10-S and formaldehyde sensor interface circuit form; NH
3sensor assembly (2) is by electrochemical sensor ME3-NH
3form with ammoniacal sensor interface circuit; C
6h
6sensor assembly (3) is by electrochemical sensor ME4-C
6h
6form with benzene sensor interface circuitry; These three kinds of electrochemical sensors include electrode (CE), contrast electrode (RE) and working electrode (SE); The structure of these three kinds of sensor interface circuitries is identical; Described sensor interface circuitry comprises the first operational amplifier (IC1) and field effect transistor (Q); Electrochemical sensor electrode (CE) is connected with the output terminal of the first operational amplifier (IC1) with one end of the first electric capacity (C1), one end of the second electric capacity (C2) respectively; The contrast electrode of electrochemical sensor (RE) is connected with the source electrode of field effect transistor (Q) with one end of the first resistance (R1) respectively, the drain electrode of field effect transistor (Q) connects the working electrode (SE) of electrochemical sensor, the grid of field effect transistor (Q) is connected with one end of the 4th resistance (R4), another termination+5V voltage of the 4th resistance (R4); The other end of the first resistance (R1) is connected with the other end of the first electric capacity (C1) with one end of the second resistance (R2) respectively, and the other end of the second resistance (R2) connects respectively the other end of the second electric capacity (C2) and the inverting input of the first operational amplifier (IC1); The normal phase input end of the first operational amplifier (IC1) connects one end of the 3rd resistance (R3), the other end ground connection of the 3rd resistance (R3); The working electrode of electrochemical sensor (SE) is connected with current-to-voltage converting circuit.
3. Portable type room air quality fast detector according to claim 1, is characterized in that, described the first current-to-voltage converting circuit (18), the second current-to-voltage converting circuit (17) are identical with the structure of the 3rd current-to-voltage converting circuit (5),
Described current-to-voltage converting circuit comprises the second operational amplifier (IC2) and the 3rd operational amplifier (IC3), the normal phase input end of the second operational amplifier (IC2) is connected with one end of the 6th resistance (R6) with one end of the 5th resistance (R5) respectively, the working electrode (SE) of another termination electrochemical sensor of the 5th resistance (R5); The other end of the 6th resistance (R6) is connected with one end of one end of the second potentiometer (R8), the moving contact of the second potentiometer (8) and the first potentiometer (R7) respectively; The other end difference ground connection of the second potentiometer (R8) and one end of the 15 resistance (R15), the normal phase input end of another termination the 3rd operational amplifier (IC3) of the 15 resistance (R15); The inverting input of the 3rd operational amplifier (IC3) is connected with one end of the 17 resistance (R17) with one end of the 16 resistance (R16) respectively; The moving contact of the other end of the other end of the 17 resistance (R17), the first potentiometer (R7) and the first potentiometer (R7) connects respectively the output terminal of the 3rd operational amplifier (IC3), and the output terminal of the 3rd operational amplifier (IC3) is connected with low-pass filtering amplifying circuit; The other end of the 16 resistance (R16) is connected with the output terminal of the second operational amplifier (IC2) with one end of the 14 resistance (R14) respectively, and the inverting input of the second operational amplifier (IC2) is connected with one end of the 9th resistance (R9) with one end of the 14 resistance (R14) other end, the tenth resistance (R10) respectively; The other end ground connection of the 9th resistance (R9), the moving contact of another termination the 3rd potentiometer (R11) of the tenth resistance (R10), one end of one termination the 12 resistance (R12) of the 3rd potentiometer (R11), another termination+2.5V voltage of the 12 resistance (R12); One end of another termination the 13 resistance (R13) of the 3rd potentiometer (R11), another termination-2.5V voltage of the 13 resistance (R13).
4. Portable type room air quality fast detector according to claim 1, is characterized in that, described the first low-pass filtering amplifying circuit (16), the second low-pass filtering amplifying circuit (15) are identical with the structure of the 3rd low-pass filtering amplifying circuit (7);
Described low-pass filtering amplifying circuit comprises four-operational amplifier (IC4), and the normal phase input end of four-operational amplifier (IC) is connected with one end of the 20 resistance (R20), the other end ground connection of the 20 resistance (R20); The inverting input of four-operational amplifier (IC4) is connected with one end of the 4th electric capacity (C4) with one end of the 19 resistance (R19) respectively, the other end of the 19 resistance (R19) is connected with one end of one end of the 18 resistance (R18), one end of the 3rd electric capacity (C3) and the 4th potentiometer (R21) respectively, the other end ground connection of the 3rd electric capacity (C3), the other end of the 18 resistance (R18) is connected with the output terminal of the 3rd operational amplifier (IC3); The moving contact of the other end of the 4th potentiometer (R21), the 4th potentiometer (R21), the 4th other end of electric capacity (C4) and the output terminal of four-operational amplifier (IC4) are connected with one end of the 22 resistance (R22) respectively, another termination A/D change-over circuit (8) of the 22 resistance (R22).
5. Portable type room air quality fast detector according to claim 1, is characterized in that, described VOC sensor assembly (4) adopts piD-TECH plus sensor; The 4th described low-pass filtering amplifying circuit (6) comprises the 5th operational amplifier (IC5), the normal phase input end of the 5th operational amplifier (IC5) is connected with one end of the 24 resistance (R24) with one end of the 7th electric capacity (C7) respectively, the other end of the 24 resistance (R24) is connected with one end of the 23 resistance (R23) with one end of the 6th electric capacity (C6) respectively, the output terminal (OUT) of another termination piD-TECH plus sensor of the 23 resistance (R23); The other end of the 7th electric capacity (C7) respectively with the other end of the 6th electric capacity (C6), one end of the 5th electric capacity (C5) with ground be connected, the input end (VCC) of another termination piD-TECH plus sensor of the 5th electric capacity (C5); (GND) end ground connection of piD-TECH plus sensor; The inverting input of the 5th operational amplifier (IC5) is connected with one end of the 26 resistance (R26) with one end of the 25 resistance (R25) respectively, the other end ground connection of the 25 resistance (R25), the output terminal of the other end of the 26 resistance (R26) and the 5th operational amplifier (IC5) is connected with one end of the 27 resistance (R27) respectively, and the other end of the 27 resistance (R27) is connected with A/D change-over circuit (8).
6. according to Portable type room air quality fast detector described in claim 1,4 or 5, it is characterized in that, described A/D change-over circuit (8) adopts four-way analog to digital converter AD7856-2.
7. Portable type room air quality fast detector according to claim 1, it is characterized in that, FPGA processor (9) also shows that with USB interface (10), function button (11), humiture detection module (13) and liquid crystal and pilot lamp (14) are connected respectively.
8. according to Portable type room air quality fast detector described in claim 1 or 7, it is characterized in that, described FPGA processor (9) adopts field programmable gate array EP2C5T144C8 device.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901172A (en) * | 2014-04-15 | 2014-07-02 | 江苏大学 | Gas quality detector |
| CN104345137A (en) * | 2014-09-26 | 2015-02-11 | 邹思佳 | Paint mixing cutter for detecting harmful substances |
| CN105136878A (en) * | 2015-08-14 | 2015-12-09 | 成都易思科科技有限公司 | CO detection signal amplifying circuit |
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| CN107045040A (en) * | 2016-12-28 | 2017-08-15 | 汪家琳 | Indoor toxic gas automatic detection and purification air interchanger |
| CN107561215A (en) * | 2017-06-05 | 2018-01-09 | 苏州天信德环保科技有限公司 | A kind of gridding miniature air quality-monitoring substation |
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| WO2022141475A1 (en) * | 2020-12-31 | 2022-07-07 | 广州奥松电子有限公司 | Measurement system and apparatus, and measurement method and temperature and humidity compensation method therefor |
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| CN103901172A (en) * | 2014-04-15 | 2014-07-02 | 江苏大学 | Gas quality detector |
| CN103901172B (en) * | 2014-04-15 | 2016-06-15 | 江苏大学 | A kind of gaseous mass detector |
| CN104345137A (en) * | 2014-09-26 | 2015-02-11 | 邹思佳 | Paint mixing cutter for detecting harmful substances |
| CN105136878A (en) * | 2015-08-14 | 2015-12-09 | 成都易思科科技有限公司 | CO detection signal amplifying circuit |
| CN106442868A (en) * | 2016-07-14 | 2017-02-22 | 广东红禾朗科技实业有限公司 | Portable air quality tester |
| CN106510751A (en) * | 2016-09-28 | 2017-03-22 | 华南师范大学 | Multifunctional electronic stethoscope and auscultation system |
| CN106647446A (en) * | 2016-10-28 | 2017-05-10 | 江苏金米智能科技有限责任公司 | Intelligent monitoring system for community environment |
| CN106680441A (en) * | 2016-11-29 | 2017-05-17 | 北京无线电计量测试研究所 | Portable meat detector, system and method |
| CN107045040A (en) * | 2016-12-28 | 2017-08-15 | 汪家琳 | Indoor toxic gas automatic detection and purification air interchanger |
| CN107561215A (en) * | 2017-06-05 | 2018-01-09 | 苏州天信德环保科技有限公司 | A kind of gridding miniature air quality-monitoring substation |
| CN107831274A (en) * | 2017-11-06 | 2018-03-23 | 南京力通达电气技术有限公司 | One kind is used for bushing oil and gas composite on-Line Monitor Device |
| WO2022141475A1 (en) * | 2020-12-31 | 2022-07-07 | 广州奥松电子有限公司 | Measurement system and apparatus, and measurement method and temperature and humidity compensation method therefor |
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