CN205538571U - Particulate matter concentration measurement system in low concentration particulate matter online test appearance - Google Patents
Particulate matter concentration measurement system in low concentration particulate matter online test appearance Download PDFInfo
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- CN205538571U CN205538571U CN201620097755.2U CN201620097755U CN205538571U CN 205538571 U CN205538571 U CN 205538571U CN 201620097755 U CN201620097755 U CN 201620097755U CN 205538571 U CN205538571 U CN 205538571U
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Abstract
The utility model relates to a particulate matter concentration measurement system in low concentration particulate matter online test appearance belongs to particulate matter detection's technical field, the problem of the technique is solved for: the utility model provides a measuring accuracy is high, the little particulate matter concentration measurement system in low concentration particulate matter online test appearance of test error, the technical scheme who adopts does: a particulate matter concentration measurement system in low concentration particulate matter online test appearance, includes: power circuit board, analog circuit board and digital circuit board, power circuit board is used for providing the power for analog circuit board and digital circuit board, the analog circuit board includes: laser instrument, the luminous circuit of laser instrument and signal conditioning circuit, the digital circuit board includes master control circuit, voltage - current conversion circuit and communication circuit, the laser instrument give out light, give off light circuit, signal conditioning circuit, voltage - current conversion circuit and communication circuit respectively with master control circuit links to each other, be applicable to environment detection area.
Description
Technical field
Measuring concentration of granules in certain system in the utility model a kind of low concentrations of particulates thing In-circiut tester, belongs to the technical field of particulate matter detection.
Background technology
At field of Environment Protection, the data accuracy of particulate matter on-line monitoring instrument is most important, and it is the sole indicator evaluating prevention and control of pollution source facility regulation effect；The most domestic main product is direct insertion rear scattering laser particulate matter tester, but, this particulate matter surveys the data accuracy of instrument online but by such as: the many factors such as flue dust humidity, particle size are affected, and cause its certainty of measurement low, and measure error is big.
It is embodied in original particulate matter tester test circuit:
The power supply noise of power unit is big, generally 10mV, and can only power with 24V, and available machine time length is easily caused power supply hot；Artificial circuit part, general employing base amplifier, as amplifying and filtering, owing to the multiplication factor of photodiode signal is required very big by circuit, causes bigger temperature drift and time drift；Current output circuit portions, common " amplifier+triode " of general employing carries out electric current output, the electric current poor linearity of output.
To sum up, original particulate matter In-circiut tester is suitable only for testing the particulate matter of high concentration, is not suitable for testing low concentrations of particulates thing, therefore, a kind of can carry out the tester of on-line testing and be just particularly important by low concentrations of particulates thing.
Utility model content
The utility model overcomes the deficiency that prior art exists, technical problem to be solved to be: provide the measuring concentration of granules in certain system in the low concentrations of particulates thing In-circiut tester that a kind of measuring accuracy is high, test error is little.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is:
A kind of measuring concentration of granules in certain system in low concentrations of particulates thing In-circiut tester, including: power supply circuit board, analog circuit board and digital circuit board, described power supply circuit board is for providing power supply to analog circuit board and digital circuit board；Described analog circuit board includes: laser instrument, laser instrument illuminating circuit and signal conditioning circuit, described digital circuit board includes that governor circuit, current/charge-voltage convertor and telecommunication circuit, described laser instrument illuminating circuit, signal conditioning circuit, current/charge-voltage convertor are connected with described governor circuit respectively with telecommunication circuit；Described laser instrument illuminating circuit receives the control laser instrument luminescence instruction that governor circuit is sent, and the laser signal that laser instrument is launched is converted to current signal send back to governor circuit, the laser signal that described laser instrument is launched produces light scattering signal after exposing to tested particulate matter；Described signal conditioning circuit receives light scattering signal, and according to the signal condition instruction that governor circuit is sent, the light scattering signal received is carried out signal amplification and Gain tuning；Light scattering signal after the adjustment that described governor circuit receiving signal reason circuit is sent, light scattering signal after this adjustment is converted to the concentration voltage signal of tested particulate matter, and this concentration voltage signal is sent carry out electric current conversion to current/charge-voltage convertor after export.
Preferably, described power supply circuit board includes on-off circuit, mu balanced circuit and power polarity conversion circuit, described on-off circuit is connected with described mu balanced circuit and power polarity conversion circuit respectively, described mu balanced circuit and the 5V output voltage terminals A1 of power supply circuit board, and the 3.2V output voltage terminals A2 of power supply circuit board is connected, described power polarity conversion circuit and the 485-5V output voltage terminals A3 of power supply circuit board, and-5V output voltage terminals the A4 of power supply circuit board is connected.
nullThe circuit structure of described laser instrument illuminating circuit is: including: laser-driven chip IC1，One end of the negative pole end KLD and resistance R1 of described laser-driven chip IC1 is connected，It is connected with the negative pole of laser instrument behind one end of the other end shunt-wound capacitance C1 of described resistance R1，The positive pole of described laser-driven chip IC1 monitors that end AMD is connected with the positive pole of laser instrument，It is connected with the control signal output PWM-1 of governor circuit after the input IN series resistor R2 of described laser-driven chip IC1，One end of the power end VCC shunt-wound capacitance C2 of described laser-driven chip IC1、Behind one end of electric capacity C3, the 5V output voltage terminals A1 with power supply circuit board is connected，Ground connection after the other end of the other end shunt-wound capacitance C3 of described electric capacity C2，With one end of electric capacity C5 after the house dog end CWD serial capacitance C4 of described laser-driven chip IC1、Ground connection after one end connection of electric capacity R3，The other end of described electric capacity C5 controls end CI with the power of laser-driven chip IC1 and is connected，The other end of described resistance R3 is connected with the reference current input ISET end of laser-driven chip IC1；The other end of described electric capacity C1 one end of connecting resistance R4, the common port of laser instrument, the input negative terminal IN-of amplifier IC2, the other end of described resistance R4 also meets the 5V output voltage terminals A1 of power supply circuit board, the input anode IN+ of amplifier IC2, the earth terminal GND ground connection of described amplifier IC2, the positive input terminal of the output OUT and amplifier IC3 of described amplifier IC2 is connected, the negative input end of described amplifier IC3 is also connected with the laser current input LS-1 of governor circuit after connecing the output of amplifier IC3, the power supply negative terminal V-ground connection of described amplifier IC3, one end of the power positive end V+ shunt-wound capacitance C6 of described amplifier IC3, the 3.2V output voltage terminals A2 of power supply circuit board, the other end ground connection of described electric capacity C6.
Preferably, described signal conditioning circuit includes pressure drop circuit and the gain adjustment circuit being sequentially connected with, described pressure drop circuit respectively with the 3.2V output voltage terminals A2 of described power supply circuit board, and-5V output voltage terminals the A4 of power supply circuit board is connected, the voltage positive output terminal B1 output 2.5V voltage of described pressure drop circuit, the voltage negative lead-out terminal B2 of described pressure drop circuit exports-2.5V voltage.
nullThe circuit structure of described gain adjustment circuit is: including: light receiving diode D1，The plus earth of described light receiving diode D1，The negative pole of described light receiving diode D1 and after connecing the input negative terminal of amplifier IC21 with one end of resistance R21、One end of electric capacity C21 is connected，With the other end of electric capacity C21 after the other end of the other end shunt-wound capacitance C21 of described resistance R21、One end of electric capacity C23、The output OUT of amplifier IC21 is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit behind one end of the power positive end V+ shunt-wound capacitance C22 of described amplifier IC21，The other end ground connection of described electric capacity C22，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit behind one end of the power supply negative terminal V-shunt-wound capacitance C24 of described amplifier IC21，The other end ground connection of described electric capacity C24，The input positive ending grounding of described amplifier IC21；nullIt is connected with one end of resistance R23 after the other end of described electric capacity C23 one end of connecting resistance R22，The other end ground connection of described resistance R22，It is connected with the negative input end of amplifier IC22 after the other end of described resistance R23 one end of connecting resistance R25，The other end of described resistance R25 also connects one end and the sliding end of adjustable resistance R26 of adjustable resistance R26，The other end of described adjustable resistance R26 and after connecing the output of amplifier IC22 with the input S2B of single-pole double-throw switch (SPDT) K1、The input S1A of single-pole double-throw switch (SPDT) K1 is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit behind one end of the power positive end V+ shunt-wound capacitance C26 of described amplifier IC22，The other end ground connection of described electric capacity C26，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit behind one end of the power supply negative terminal V-shunt-wound capacitance C25 of described amplifier IC22，The other end ground connection of described electric capacity C25，Ground connection after the input anode series resistor R24 of described amplifier IC21；nullThe input S2A the input S3B of order double-pole double throw switch K1 of described single-pole double-throw switch (SPDT) K1、Input D3、Input S3A、Ground connection after low level Enable Pin EN，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit after the power end VSS shunt-wound capacitance C30 of described single-pole double-throw switch (SPDT) K1，Ground connection after the other end of described electric capacity C30 the earth terminal GND of order double-pole double throw switch K1，The control end A0 of described single-pole double-throw switch (SPDT) K1 connecing controls the one end after end A1 with resistance R31、The control signal output SYNC of governor circuit is connected，The other end of described resistance R31 is connected with voltage positive output terminal B1 of pressure drop circuit，The control end A2 of described single-pole double-throw switch (SPDT) K1 also connects ground connection after input S1B，It is connected with voltage positive output terminal B1 of pressure drop circuit behind one end of the power end VDD shunt-wound capacitance C31 of described single-pole double-throw switch (SPDT) K1，The other end ground connection of described electric capacity C31，After the output D2 series resistor R32 of described single-pole double-throw switch (SPDT) K1 and one end of connecting resistance R34、The input negative terminal of amplifier IC31，The other end of described resistance R34 is also connected with one end of resistance R36 after connecing the output of amplifier IC31，It is connected with one end of resistance R33 after the input anode of described amplifier IC31 one end of connecting resistance R35，The other end of described resistance R33 is connected with the output D1 of single-pole double-throw switch (SPDT) K1，The other end ground connection of described resistance R35，It is connected with voltage positive output terminal B1 of pressure drop circuit behind one end of the power positive end V+ shunt-wound capacitance C33 of described amplifier IC31，The other end ground connection of described electric capacity C33，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit behind one end of the power supply negative terminal V-shunt-wound capacitance C32 of described amplifier IC31，The other end ground connection of described electric capacity C32；nullIt is connected with one end of electric capacity C34 after the other end of described resistance R36 one end of connecting resistance R37，It is connected with the input anode of amplifier I32 behind one end of the other end shunt-wound capacitance C37 of described resistance R37，The other end ground connection of described electric capacity C37，It is connected with one end of resistance R39 after the input negative terminal of described amplifier I32 one end of connecting resistance R38，The other end ground connection of described resistance R38，The other end of described resistance R39 and after connecing the output of amplifier I32 with the other end of electric capacity C34、The input SIGNAL of governor circuit is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit behind one end of the power positive end V+ shunt-wound capacitance C35 of described amplifier IC32，The other end ground connection of described electric capacity C35，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit behind one end of the power supply negative terminal V-shunt-wound capacitance C36 of described amplifier IC32，The other end ground connection of described electric capacity C36.
The utility model compared with prior art has the advantages that
1, the measuring concentration of granules in certain system in a kind of low concentrations of particulates of the utility model thing In-circiut tester, during use, the control laser instrument luminescence instruction that governor circuit is sent is received by laser instrument illuminating circuit, and the laser signal that laser instrument is launched is converted to current signal send back to governor circuit, the laser signal that described laser instrument is launched produces light scattering signal after exposing to tested particulate matter；Described signal conditioning circuit receives light scattering signal, and according to the signal condition instruction that governor circuit is sent, the light scattering signal received is carried out signal amplification and Gain tuning；Light scattering signal after the adjustment that described governor circuit receiving signal reason circuit is sent, light scattering signal after this adjustment is converted to the concentration voltage signal of tested particulate matter, and this concentration voltage signal is sent carry out electric current conversion to current/charge-voltage convertor after export；Achieve the detection of the particle concentration to tested gas, by laser instrument illuminating circuit and the signal transacting of signal conditioning circuit, avoid the measure error that signal disturbing causes greatly, improve certainty of measurement.
2, in the utility model, described amplifier IC2 has zero shift characteristic, solve temperature drift and time drift；Make the measuring accuracy height of particulate matter In-circiut tester, noise is low, test error is little, is suitable for the on-line checking of low concentrations of particulates thing.
3, in the utility model, power supply circuit board includes on-off circuit, mu balanced circuit and power polarity conversion circuit, by mu balanced circuit and power polarity conversion circuit, external power supply is converted the voltage needed for analog circuit board and digital circuit board, wherein on-off circuit have employed switching power source chip step-down so that the input power of this measurement system can be from 9V ~ 36V, and described current/charge-voltage convertor is electric current loop chip, greatly reducing noise, the linearity is good.
Accompanying drawing explanation
The utility model is described in more detail below in conjunction with the accompanying drawings.
Fig. 1 is electrical block diagram of the present utility model；
Fig. 2 is the structural representation of power supply circuit board in the utility model；
Fig. 3 is the structural representation of signal conditioning circuit in the utility model；
Fig. 4 is the circuit theory diagrams of laser instrument illuminating circuit in the utility model；
Fig. 5 is the circuit theory diagrams of gain adjustment circuit in the utility model；
In figure: 1 is power supply circuit board, 2 is analog circuit board, and 3 is digital circuit board, 4 is laser instrument illuminating circuit, and 5 is laser instrument illuminating circuit, and 6 is governor circuit, 7 is current/charge-voltage convertor, 8 is telecommunication circuit, and 9 is laser instrument, and 10 is on-off circuit, 11 is mu balanced circuit, 12 is power polarity conversion circuit, and 13 is pressure drop circuit, and 14 is gain adjustment circuit.
Detailed description of the invention
As shown in Figures 1 to 5, a kind of measuring concentration of granules in certain system in low concentrations of particulates thing In-circiut tester, including: power supply circuit board 1, analog circuit board 2 and digital circuit board 3, described: power supply circuit board 1 is for providing power supply to analog circuit board 2 and digital circuit board 3；Described analog circuit board 2 includes: laser instrument 9, laser instrument illuminating circuit 4 and signal conditioning circuit 5, described digital circuit board 3 includes that governor circuit 6, current/charge-voltage convertor 7 and telecommunication circuit 8, described laser instrument illuminating circuit 4, signal conditioning circuit 5, current/charge-voltage convertor 7 are connected with described governor circuit 6 respectively with telecommunication circuit 8；Described laser instrument illuminating circuit 4 receives the luminous instruction of control laser instrument 9 that governor circuit 6 is sent, and the laser signal that laser instrument 9 is launched is converted to current signal send back to governor circuit 6, the laser signal that described laser instrument 9 is launched produces light scattering signal after exposing to tested particulate matter；Described signal conditioning circuit 5 receives light scattering signal, and according to the signal condition instruction that governor circuit 6 is sent, the light scattering signal received is carried out signal amplification and Gain tuning；Light scattering signal after the adjustment that described governor circuit 6 receiving signal reason circuit 5 is sent, light scattering signal after this adjustment is converted to the concentration voltage signal of tested particulate matter, and this concentration voltage signal is sent carry out electric current conversion to current/charge-voltage convertor 7 after export.
Specifically, described power supply circuit board 1 includes on-off circuit 10, mu balanced circuit 11 and power polarity conversion circuit 12, described on-off circuit 10 is connected with described mu balanced circuit 11 and power polarity conversion circuit 12 respectively, described mu balanced circuit 11 and the 5V output voltage terminals A1 of power supply circuit board 1, and the 3.2V output voltage terminals A2 of power supply circuit board 1 is connected, described power polarity conversion circuit 12 and the 485-5V output voltage terminals A3 of power supply circuit board 1, and-5V output voltage terminals the A4 of power supply circuit board 1 is connected；Described signal conditioning circuit 5 includes pressure drop circuit 13 and the gain adjustment circuit 14 being sequentially connected with, described pressure drop circuit 13 respectively with the 3.2V output voltage terminals A2 of described power supply circuit board 1, and-5V output voltage terminals the A4 of power supply circuit board 1 is connected, the voltage positive output terminal B1 output 2.5V voltage of described pressure drop circuit 13, the voltage negative lead-out terminal B2 of described pressure drop circuit 13 exports-2.5V voltage.
nullFurther，The circuit structure of described laser instrument illuminating circuit 4 is: including: laser-driven chip IC1，One end of the negative pole end KLD and resistance R1 of described laser-driven chip IC1 is connected，It is connected with the negative pole of laser instrument 9 behind one end of the other end shunt-wound capacitance C1 of described resistance R1，The positive pole of described laser-driven chip IC1 monitors that end AMD is connected with the positive pole of laser instrument 9，It is connected with the control signal output PWM-1 of governor circuit 6 after the input IN series resistor R2 of described laser-driven chip IC1，One end of the power end VCC shunt-wound capacitance C2 of described laser-driven chip IC1、Behind one end of electric capacity C3, the 5V output voltage terminals A1 with power supply circuit board 1 is connected，Ground connection after the other end of the other end shunt-wound capacitance C3 of described electric capacity C2，With one end of electric capacity C5 after the house dog end CWD serial capacitance C4 of described laser-driven chip IC1、Ground connection after one end connection of electric capacity R3，The other end of described electric capacity C5 controls end CI with the power of laser-driven chip IC1 and is connected，The other end of described resistance R3 is connected with the reference current input ISET end of laser-driven chip IC1；nullThe other end of described electric capacity C1 one end of connecting resistance R4、The common port of laser instrument 9、The input negative terminal IN-of amplifier IC2，The other end of described resistance R4 also meets the 5V output voltage terminals A1 of power supply circuit board 1、The input anode IN+ of amplifier IC2，The earth terminal GND ground connection of described amplifier IC2，The positive input terminal of the output OUT and amplifier IC3 of described amplifier IC2 is connected，The negative input end of described amplifier IC3 is also connected with the laser current input LS-1 of governor circuit 6 after connecing the output of amplifier IC3，The power supply negative terminal V-ground connection of described amplifier IC3，One end of the power positive end V+ shunt-wound capacitance C6 of described amplifier IC3、The 3.2V output voltage terminals A2 of power supply circuit board 1，The other end ground connection of described electric capacity C6.
nullThe circuit structure of described gain adjustment circuit 14 is: including: light receiving diode D1，The plus earth of described light receiving diode D1，The negative pole of described light receiving diode D1 and after connecing the input negative terminal of amplifier IC21 with one end of resistance R21、One end of electric capacity C21 is connected，With the other end of electric capacity C21 after the other end of the other end shunt-wound capacitance C21 of described resistance R21、One end of electric capacity C23、The output OUT of amplifier IC21 is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit 13 behind one end of the power positive end V+ shunt-wound capacitance C22 of described amplifier IC21，The other end ground connection of described electric capacity C22，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit 13 behind one end of the power supply negative terminal V-shunt-wound capacitance C24 of described amplifier IC21，The other end ground connection of described electric capacity C24，The input positive ending grounding of described amplifier IC21；
nullIt is connected with one end of resistance R23 after the other end of described electric capacity C23 one end of connecting resistance R22，The other end ground connection of described resistance R22，It is connected with the negative input end of amplifier IC22 after the other end of described resistance R23 one end of connecting resistance R25，The other end of described resistance R25 also connects one end and the sliding end of adjustable resistance R26 of adjustable resistance R26，The other end of described adjustable resistance R26 and after connecing the output of amplifier IC22 with the input S2B of single-pole double-throw switch (SPDT) K1、The input S1A of single-pole double-throw switch (SPDT) K1 is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit 13 behind one end of the power positive end V+ shunt-wound capacitance C26 of described amplifier IC22，The other end ground connection of described electric capacity C26，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit 13 behind one end of the power supply negative terminal V-shunt-wound capacitance C25 of described amplifier IC22，The other end ground connection of described electric capacity C25，Ground connection after the input anode series resistor R24 of described amplifier IC21；nullThe input S2A the input S3B of order double-pole double throw switch K1 of described single-pole double-throw switch (SPDT) K1、Input D3、Input S3A、Ground connection after low level Enable Pin EN，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit 13 after the power end VSS shunt-wound capacitance C30 of described single-pole double-throw switch (SPDT) K1，Ground connection after the other end of described electric capacity C30 the earth terminal GND of order double-pole double throw switch K1，The control end A0 of described single-pole double-throw switch (SPDT) K1 connecing controls the one end after end A1 with resistance R31、The control signal output SYNC of governor circuit 6 is connected，The other end of described resistance R31 is connected with voltage positive output terminal B1 of pressure drop circuit 13，The control end A2 of described single-pole double-throw switch (SPDT) K1 also connects ground connection after input S1B，It is connected with voltage positive output terminal B1 of pressure drop circuit 13 behind one end of the power end VDD shunt-wound capacitance C31 of described single-pole double-throw switch (SPDT) K1，The other end ground connection of described electric capacity C31，After the output D2 series resistor R32 of described single-pole double-throw switch (SPDT) K1 and one end of connecting resistance R34、The input negative terminal of amplifier IC31，The other end of described resistance R34 is also connected with one end of resistance R36 after connecing the output of amplifier IC31，It is connected with one end of resistance R33 after the input anode of described amplifier IC31 one end of connecting resistance R35，The other end of described resistance R33 is connected with the output D1 of single-pole double-throw switch (SPDT) K1，The other end ground connection of described resistance R35，It is connected with voltage positive output terminal B1 of pressure drop circuit 13 behind one end of the power positive end V+ shunt-wound capacitance C33 of described amplifier IC31，The other end ground connection of described electric capacity C33，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit 13 behind one end of the power supply negative terminal V-shunt-wound capacitance C32 of described amplifier IC31，The other end ground connection of described electric capacity C32；nullIt is connected with one end of electric capacity C34 after the other end of described resistance R36 one end of connecting resistance R37，It is connected with the input anode of amplifier I32 behind one end of the other end shunt-wound capacitance C37 of described resistance R37，The other end ground connection of described electric capacity C37，It is connected with one end of resistance R39 after the input negative terminal of described amplifier I32 one end of connecting resistance R38，The other end ground connection of described resistance R38，The other end of described resistance R39 and after connecing the output of amplifier I32 with the other end of electric capacity C34、The input SIGNAL of governor circuit 6 is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit 13 behind one end of the power positive end V+ shunt-wound capacitance C35 of described amplifier IC32，The other end ground connection of described electric capacity C35，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit 13 behind one end of the power supply negative terminal V-shunt-wound capacitance C36 of described amplifier IC32，The other end ground connection of described electric capacity C36.
In the present embodiment, described current/charge-voltage convertor 7 is electric current loop chip；Described amplifier IC2 has zero shift characteristic, solve temperature drift and time drift；On-off circuit have employed switching power source chip step-down so that the input power of this measurement system from 9V ~ 36V, can improve the ability of the anti-power-supply fluctuation of tester；Described current/charge-voltage convertor includes that model is electric current loop chip, greatly reduces noise, and the linearity is good so that the measuring accuracy of particulate matter In-circiut tester is high, noise is low, test error is little, is suitable for the on-line checking of low concentrations of particulates thing.
The utility model achieves the detection of the particle concentration to tested gas, by laser instrument illuminating circuit and the signal transacting of signal conditioning circuit, avoid the measure error that signal disturbing causes greatly, improve certainty of measurement, by test, the concentration signal being converted into fluctuation is reduced to 0.1mg.Meet the requirement of low concentration Apparatus for Dust Content in Stack.
To sum up, the utility model has substantive distinguishing features and progress, above in conjunction with accompanying drawing, embodiment of the present utility model is explained in detail, but the utility model is not limited to above-described embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible on the premise of without departing from the utility model objective, various changes can be made.
Claims (5)
1. the measuring concentration of granules in certain system in a low concentrations of particulates thing In-circiut tester, including: power supply circuit board (1), analog circuit board (2) and digital circuit board (3), described power supply circuit board (1) is for providing power supply to analog circuit board (2) and digital circuit board (3)；
It is characterized in that: described analog circuit board (2) including: laser instrument (9), laser instrument illuminating circuit (4) and signal conditioning circuit (5), described digital circuit board (3) includes that governor circuit (6), current/charge-voltage convertor (7) and telecommunication circuit (8), described laser instrument illuminating circuit (4), signal conditioning circuit (5), current/charge-voltage convertor (7) are connected with described governor circuit (6) respectively with telecommunication circuit (8)；
Described laser instrument illuminating circuit (4) receives the luminous instruction of control laser instrument (9) that governor circuit (6) is sent, and the laser signal that laser instrument (9) is launched is converted to current signal send back to governor circuit (6), the laser signal that described laser instrument (9) is launched produces light scattering signal after exposing to tested particulate matter；Described signal conditioning circuit (5) receives light scattering signal, and according to the signal condition instruction that governor circuit (6) is sent, the light scattering signal received is carried out signal amplification and Gain tuning；
Light scattering signal after the adjustment that described governor circuit (6) receiving signal reason circuit (5) is sent, light scattering signal after this adjustment is converted to the concentration voltage signal of tested particulate matter, and this concentration voltage signal is sent carry out electric current conversion to current/charge-voltage convertor (7) after export.
Measuring concentration of granules in certain system in a kind of low concentrations of particulates thing In-circiut tester the most according to claim 1, it is characterized in that: described power supply circuit board (1) includes on-off circuit (10), mu balanced circuit (11) and power polarity conversion circuit (12), described on-off circuit (10) is connected with described mu balanced circuit (11) and power polarity conversion circuit (12) respectively, described mu balanced circuit (11) and the 5V output voltage terminals A1 of power supply circuit board (1), and the 3.2V output voltage terminals A2 of power supply circuit board (1) is connected, described power polarity conversion circuit (12) and the 485-5V output voltage terminals A3 of power supply circuit board (1), and-5V output voltage terminals the A4 of power supply circuit board (1) is connected.
nullMeasuring concentration of granules in certain system in a kind of low concentrations of particulates thing In-circiut tester the most according to claim 1，It is characterized in that: the circuit structure of described laser instrument illuminating circuit (4) is: including: laser-driven chip IC1，One end of the negative pole end KLD and resistance R1 of described laser-driven chip IC1 is connected，Behind one end of the other end shunt-wound capacitance C1 of described resistance R1, the negative pole with laser instrument (9) is connected，The positive pole of described laser-driven chip IC1 monitors that end AMD is connected with the positive pole of laser instrument (9)，It is connected with the control signal output PWM-1 of governor circuit (6) after the input IN series resistor R2 of described laser-driven chip IC1，One end of the power end VCC shunt-wound capacitance C2 of described laser-driven chip IC1、Behind one end of electric capacity C3, the 5V output voltage terminals A1 with power supply circuit board (1) is connected，Ground connection after the other end of the other end shunt-wound capacitance C3 of described electric capacity C2，With one end of electric capacity C5 after the house dog end CWD serial capacitance C4 of described laser-driven chip IC1、Ground connection after one end connection of electric capacity R3，The other end of described electric capacity C5 controls end CI with the power of laser-driven chip IC1 and is connected，The other end of described resistance R3 is connected with the reference current input ISET end of laser-driven chip IC1；
nullThe other end of described electric capacity C1 one end of connecting resistance R4、The common port of laser instrument (9)、The input negative terminal IN-of amplifier IC2，The other end of described resistance R4 also meets the 5V output voltage terminals A1 of power supply circuit board (1)、The input anode IN+ of amplifier IC2，The earth terminal GND ground connection of described amplifier IC2，The positive input terminal of the output OUT and amplifier IC3 of described amplifier IC2 is connected，The negative input end of described amplifier IC3 is also connected with the laser current input LS-1 of governor circuit (6) after connecing the output of amplifier IC3，The power supply negative terminal V-ground connection of described amplifier IC3，One end of the power positive end V+ shunt-wound capacitance C6 of described amplifier IC3、The 3.2V output voltage terminals A2 of power supply circuit board (1)，The other end ground connection of described electric capacity C6.
Measuring concentration of granules in certain system in a kind of low concentrations of particulates thing In-circiut tester the most according to claim 1, it is characterized in that: described signal conditioning circuit (5) includes pressure drop circuit (13) and the gain adjustment circuit (14) being sequentially connected with, described pressure drop circuit (13) respectively with the 3.2V output voltage terminals A2 of described power supply circuit board (1), and-5V output voltage terminals the A4 of power supply circuit board (1) is connected, the voltage positive output terminal B1 output 2.5V voltage of described pressure drop circuit (13), the voltage negative lead-out terminal B2 of described pressure drop circuit (13) exports-2.5V voltage.
nullMeasuring concentration of granules in certain system in a kind of low concentrations of particulates thing In-circiut tester the most according to claim 4，It is characterized in that: the circuit structure of described gain adjustment circuit (14) is: including: light receiving diode D1，The plus earth of described light receiving diode D1，The negative pole of described light receiving diode D1 and after connecing the input negative terminal of amplifier IC21 with one end of resistance R21、One end of electric capacity C21 is connected，With the other end of electric capacity C21 after the other end of the other end shunt-wound capacitance C21 of described resistance R21、One end of electric capacity C23、The output OUT of amplifier IC21 is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit (13) behind one end of the power positive end V+ shunt-wound capacitance C22 of described amplifier IC21，The other end ground connection of described electric capacity C22，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit (13) behind one end of the power supply negative terminal V-shunt-wound capacitance C24 of described amplifier IC21，The other end ground connection of described electric capacity C24，The input positive ending grounding of described amplifier IC21；
nullIt is connected with one end of resistance R23 after the other end of described electric capacity C23 one end of connecting resistance R22，The other end ground connection of described resistance R22，It is connected with the negative input end of amplifier IC22 after the other end of described resistance R23 one end of connecting resistance R25，The other end of described resistance R25 also connects one end and the sliding end of adjustable resistance R26 of adjustable resistance R26，The other end of described adjustable resistance R26 and after connecing the output of amplifier IC22 with the input S2B of single-pole double-throw switch (SPDT) K1、The input S1A of single-pole double-throw switch (SPDT) K1 is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit (13) behind one end of the power positive end V+ shunt-wound capacitance C26 of described amplifier IC22，The other end ground connection of described electric capacity C26，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit (13) behind one end of the power supply negative terminal V-shunt-wound capacitance C25 of described amplifier IC22，The other end ground connection of described electric capacity C25，Ground connection after the input anode series resistor R24 of described amplifier IC21；
nullThe input S2A the input S3B of order double-pole double throw switch K1 of described single-pole double-throw switch (SPDT) K1、Input D3、Input S3A、Ground connection after low level Enable Pin EN，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit (13) after the power end VSS shunt-wound capacitance C30 of described single-pole double-throw switch (SPDT) K1，Ground connection after the other end of described electric capacity C30 the earth terminal GND of order double-pole double throw switch K1，The control end A0 of described single-pole double-throw switch (SPDT) K1 connecing controls the one end after end A1 with resistance R31、The control signal output SYNC of governor circuit (6) is connected，The other end of described resistance R31 is connected with voltage positive output terminal B1 of pressure drop circuit (13)，The control end A2 of described single-pole double-throw switch (SPDT) K1 also connects ground connection after input S1B，It is connected with voltage positive output terminal B1 of pressure drop circuit (13) behind one end of the power end VDD shunt-wound capacitance C31 of described single-pole double-throw switch (SPDT) K1，The other end ground connection of described electric capacity C31，After the output D2 series resistor R32 of described single-pole double-throw switch (SPDT) K1 and one end of connecting resistance R34、The input negative terminal of amplifier IC31，The other end of described resistance R34 is also connected with one end of resistance R36 after connecing the output of amplifier IC31，It is connected with one end of resistance R33 after the input anode of described amplifier IC31 one end of connecting resistance R35，The other end of described resistance R33 is connected with the output D1 of single-pole double-throw switch (SPDT) K1，The other end ground connection of described resistance R35，It is connected with voltage positive output terminal B1 of pressure drop circuit (13) behind one end of the power positive end V+ shunt-wound capacitance C33 of described amplifier IC31，The other end ground connection of described electric capacity C33，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit (13) behind one end of the power supply negative terminal V-shunt-wound capacitance C32 of described amplifier IC31，The other end ground connection of described electric capacity C32；
nullIt is connected with one end of electric capacity C34 after the other end of described resistance R36 one end of connecting resistance R37，It is connected with the input anode of amplifier I32 behind one end of the other end shunt-wound capacitance C37 of described resistance R37，The other end ground connection of described electric capacity C37，It is connected with one end of resistance R39 after the input negative terminal of described amplifier I32 one end of connecting resistance R38，The other end ground connection of described resistance R38，The other end of described resistance R39 and after connecing the output of amplifier I32 with the other end of electric capacity C34、The input SIGNAL of governor circuit (6) is connected，It is connected with voltage positive output terminal B1 of pressure drop circuit (13) behind one end of the power positive end V+ shunt-wound capacitance C35 of described amplifier IC32，The other end ground connection of described electric capacity C35，It is connected with the voltage negative lead-out terminal B2 of pressure drop circuit (13) behind one end of the power supply negative terminal V-shunt-wound capacitance C36 of described amplifier IC32，The other end ground connection of described electric capacity C36.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105547951A (en) * | 2016-01-29 | 2016-05-04 | 中绿环保科技股份有限公司 | Particulate matter concentration measuring system in low-concentration particulate matter on-line tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105547951A (en) * | 2016-01-29 | 2016-05-04 | 中绿环保科技股份有限公司 | Particulate matter concentration measuring system in low-concentration particulate matter on-line tester |
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