CN102854117A - Optoelectronic signal acquisition and conversion device for sensor used for detecting dust concentration - Google Patents
Optoelectronic signal acquisition and conversion device for sensor used for detecting dust concentration Download PDFInfo
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- CN102854117A CN102854117A CN2012103171347A CN201210317134A CN102854117A CN 102854117 A CN102854117 A CN 102854117A CN 2012103171347 A CN2012103171347 A CN 2012103171347A CN 201210317134 A CN201210317134 A CN 201210317134A CN 102854117 A CN102854117 A CN 102854117A
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Abstract
The invention provides an optoelectronic signal acquisition and conversion device for a sensor used for detecting dust concentration, which belongs to the technical field of measuring electronics. The optoelectronic signal acquisition and conversion device comprises an I/V conversion circuit, a voltage amplifier circuit, a voltage follower circuit and a power lead-in and signal output circuit, wherein the output terminal of the power lead-in and signal output circuit is connected with the I/V conversion circuit, the voltage amplifier circuit and the voltage follower circuit, the output terminal of the I/V conversion circuit is connected with the voltage amplifier circuit, the output terminal of the voltage amplifier circuit is connected with the voltage follower circuit, the output terminal of the voltage follower circuit is connected with the power lead-in and signal output circuit, and the I/V conversion circuit comprises a silicon photocell D1, resistors R2, R3 and R5, capacitors C1 to C3 and C8 and an operational amplifier U1 with an extreme low bias current. The optoelectronic signal acquisition and conversion device has the advantages of good working stability, strong anti-interference ability, accurate acquisition data, etc.
Description
Technical field
The invention belongs to the measurement electronic technology field, relate to a kind of photoelectric signal collection conversion equipment of sensor of dust concentration, be specifically related to a kind of photoelectric signal collection conversion equipment for the optical profile type sensor of dust concentration
Background technology
Dust content is high under the coal mine, and composition is harmful, and workers with long time is worked in dust atmosphere, suffers from easily pneumoconiosis; Contain inflammable and explosive composition in the dust, cause easily fire or explosive incident; High concentrate dust can accelerate wear and tear in machines in addition, shortens the serviceable life of machine.Sensor of dust concentration is exactly in order to satisfy existing mine monitoring downhole powder dust concentration, to utilize the high-tech sensor of laser light scattering principle exploitation.Sensor of dust concentration is mainly used in the dust work places such as mine, cement mill, but there is the concentration of the dust that swims in the environment of inflammable and explosive inflammable gas potpourri in continuous detecting, can under the natural airflow state, monitor in real time, on the spot, uninterruptedly and show downhole powder dust concentration, the switching value signal of the simultaneously device for reducing dust of output and sprinkle water and spray interlock, realized the optimum efficiency of dust measuring depositing dust, have measurement quick and precisely, the function and characteristic such as highly sensitive, on the spot demonstration, remote signal, stable performance.Present stage existing sensor of dust concentration to mainly contain optics, ray, Weighing type, charge type several, wherein the use of optical profile type is the most extensive.The colliery subsurface environment is abominable, and light is very weak, and the detection accuracy of general photodiode is poor, sensitivity is low, in addition because the current signal that collects is minimum, and need to could be for subordinate's circuit after amplifying circuit amplifies; And photomultiplier sensitivity is very high, noise is low and can not be subjected to strong illumination, be adapted at using under the coal mine, it can convert faint optical signal to electric signal, but needs in use the voltage that provides higher, this causes potential safety hazard easily in the dust work place, and use cost is also higher.
Can the photoelectric signal collection conversion equipment that is used for sensor of dust concentration that for this reason, provide a kind of dust accuracy of detection height, low cost of manufacture, can use again safely be that technical matters to be solved is arranged at present
Summary of the invention
The purpose of this invention is to provide that a kind of circuit design is simple, stable work in work, cost are moderate, have the preferably photoelectric signal collection conversion equipment of the sensor of dust concentration of measurement effect.
The objective of the invention is to reach like this, a kind of photoelectric signal collection conversion equipment of sensor of dust concentration, comprise the I/V change-over circuit for output the first output voltage V out1, the voltage amplifier circuit that is used for output the second output voltage V out2, the voltage follower circuit and the power supply that are used for output the 3rd output voltage V out3 are introduced and signal output apparatus, power supply is introduced output terminal and the I/V change-over circuit with signal output apparatus, voltage amplifier circuit is connected with voltage follower circuit, the output terminal of I/V change-over circuit is connected with voltage amplifier circuit, the output terminal of voltage amplifier circuit is connected with voltage follower circuit, the output terminal of voltage follower circuit is introduced with power supply and is connected with signal output apparatus, described I/V change-over circuit comprises silicon photocell D1, resistance R 2, R3, R5, capacitor C 1～C3, C8 and utmost point Low-bias Current operational amplifier U1,2 pin of the negative pole of silicon photocell D1 and utmost point Low-bias Current operational amplifier U1, one end of resistance R 2 and an end of capacitor C 8 connect, 6 pin of utmost point Low-bias Current operational amplifier U1 and an end of resistance R 3, one end of the other end of capacitor C 8 and resistance R 5 connects, the other end of the other end connecting resistance R2 of resistance R 3, one end of another termination capacitor C 2 of resistance R 5 is also exported described the first output voltage V out1,7 pin of utmost point Low-bias Current operational amplifier U1 and an end of capacitor C 1 meet positive direct-current power supply VCC jointly, 4 pin of utmost point Low-bias Current operational amplifier U1 and an end of capacitor C 3 meet negative direct supply-VCC jointly, 3 of utmost point Low-bias Current operational amplifier U1,8 pin, the positive pole of silicon photocell D1, the other end of capacitor C 1, the other end common ground of the other end of capacitor C 3 and capacitor C 2.
The present invention is owing to adopted said structure, utilize silicon photocell to replace traditional photodiode or photomultiplier to convert the light signal that collects to electric signal, having adopted utmost point Low-bias Current operational amplifier that electric current is amplified and converts voltage in I/V change-over circuit 1 exports, in voltage amplifier circuit, adopted low noise variable gain instrument amplifier that the voltage of exporting in the I/V change-over circuit is amplified processing, in voltage follower circuit, adopted low noise, the bipolarity operational amplifier of non-chopper-zero-stabilized is as the main processing element of follower, thereby makes the present invention have good operating stability, antijamming capability is strong, the advantages such as image data standard.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Fig. 2 is the electrical schematic diagram of the I/V change-over circuit of one embodiment of the invention.
Fig. 3 is the electrical schematic diagram of the voltage amplifier circuit of one embodiment of the invention.
Fig. 4 is the electrical schematic diagram of the voltage follower circuit of one embodiment of the invention.
Fig. 5 is the power supply introducing of one embodiment of the invention and the electrical schematic diagram of signal output apparatus.
Embodiment
For the auditor that the makes Patent Office especially public can be expressly understood technical spirit of the present invention and beneficial effect more, the applicant general elaborates by reference to the accompanying drawings in the mode of embodiment below, but all be not restriction to the present invention program to the description of embodiment, any according to the present invention's design done only for pro forma but not substantial equivalent transformation all should be considered as technical scheme category of the present invention.
See also Fig. 1, a kind of photoelectric signal collection conversion equipment for sensor of dust concentration, comprise I/V change-over circuit 1, voltage amplifier circuit 2, voltage follower circuit 3 and power supply are introduced and signal output apparatus 4, described power supply is introduced with signal output apparatus 4 direct supply that main circuit provides is supplied with respectively I/V change-over circuit 1, voltage amplifier circuit 2 and voltage follower circuit 3, the output terminal of I/V change-over circuit 1 is connected with voltage amplifier circuit 2, the output terminal of voltage amplifier circuit 2 is connected with voltage follower circuit 3, the output termination power of voltage follower circuit 3 is introduced and signal output apparatus 4, is introduced with signal output apparatus 4 by power supply the signal that Collect conversion obtains is exported to subordinate equipment.
See also Fig. 2, aforesaid I/V change-over circuit 1 comprises silicon photocell D1, resistance R 2, R3, R5, capacitor C 1～C3, C8 and utmost point Low-bias Current operational amplifier U1, in the present embodiment, described silicon photocell D1 adopts S1227, and utmost point Low-bias Current operational amplifier U1 adopts AD549JH.Wherein silicon photocell D1 converts the light signal under the coal mine to electric signal, and the marking current Is that gathers is sent into 2 pin, 3 pin of utmost point Low-bias Current operational amplifier U1, capacitor C 8 strobes, the proportion resistor that resistance R 2, R3 amplify as output, capacitor C 1, C3 play the power supply filter action, the output voltage of resistance R 5 and 2 pairs of circuit of capacitor C carries out capacitance-resistance filter, thereby makes the next stage circuit can obtain pure input signal, and the proportionate relationship of the first output voltage V out1 and electric current I s is:
Vout1=Is*(R2+R3)
See also Fig. 3, aforesaid voltage amplifier circuit 2 comprises resistance R 1, R4, capacitor C 5, C7 and low noise variable gain instrument amplifier U2, and in the present embodiment, described low noise variable gain instrument amplifier U2 adopts AD623AR.Wherein 3 pin of low noise variable gain instrument amplifier U2 are as the first output voltage V out1 of described I/V change-over circuit 1 output of the input termination of circuit, resistance R 1, R4 amplify resistance as ratio, capacitor C 5, C7 play the power supply filter action, 6 pin of low noise variable gain instrument amplifier U2 are exported the second output voltage V out2, and the proportionate relationship of the second output voltage V out2 and the first output voltage V out1 is:
Vout2=(1+100KΩ/(R1+R4))*Vout1。
See also Fig. 4, aforesaid voltage follower circuit 3 comprises capacitor C 4, C6, resistance R 6 and bipolarity operational amplifier U3.In the present embodiment, described bipolarity operational amplifier U3 adopts OP07CSZ, is the bipolarity operational amplifier of low noise, non-chopper-zero-stabilized, and it uses as follower, and Main Function is to reduce output impedance.2,6 pin of bipolarity operational amplifier U3 link to each other and do the feedback use, and capacitor C 4, C6 play the power supply filter action, and resistance R 6 is current-limiting resistance, exports the 3rd output voltage V out3 by this resistance.
See also Fig. 5, aforesaid power supply is introduced with signal output apparatus 4 and is comprised socket J1, capacitor C 9, C10 and resistance R 7, wherein capacitor C 9, C10 play the power supply filter action, and resistance R 7 is stake resistance, and socket J1 is the interface of main circuit power input and the 3rd output voltage V out3 output.
In sum, technical scheme provided by the invention has overcome the shortcoming in the prior art, has reached goal of the invention, has embodied the described technique effect of applicant
Claims (1)
1.
A kind of photoelectric signal collection conversion equipment of sensor of dust concentration, it is characterized in that comprising the I/V change-over circuit (1) for output the first output voltage V out1, the voltage amplifier circuit (2) that is used for output the second output voltage V out2, the voltage follower circuit (3) and the power supply that are used for output the 3rd output voltage V out3 are introduced and signal output apparatus (4), power supply is introduced output terminal and the I/V change-over circuit (1) with signal output apparatus (4), voltage amplifier circuit (2) is connected 3 with voltage follower circuit) connect, the output terminal of I/V change-over circuit (1) is connected with voltage amplifier circuit (2), the output terminal of voltage amplifier circuit (2) is connected with voltage follower circuit (3), the output terminal of voltage follower circuit (3) is introduced with power supply and is connected with signal output apparatus (4), described I/V change-over circuit (1) comprises silicon photocell D1, resistance R 2, R3, R5, capacitor C 1～C3, C8 and utmost point Low-bias Current operational amplifier U1,2 pin of the negative pole of silicon photocell D1 and utmost point Low-bias Current operational amplifier U1, one end of resistance R 2 and an end of capacitor C 8 connect, 6 pin of utmost point Low-bias Current operational amplifier U1 and an end of resistance R 3, one end of the other end of capacitor C 8 and resistance R 5 connects, the other end of the other end connecting resistance R2 of resistance R 3, one end of another termination capacitor C 2 of resistance R 5 is also exported described the first output voltage V out1,7 pin of utmost point Low-bias Current operational amplifier U1 and an end of capacitor C 1 meet positive direct-current power supply VCC jointly, 4 pin of utmost point Low-bias Current operational amplifier U1 and an end of capacitor C 3 meet negative direct supply-VCC jointly, 3 of utmost point Low-bias Current operational amplifier U1,8 pin, the positive pole of silicon photocell D1, the other end of capacitor C 1, the other end common ground of the other end of capacitor C 3 and capacitor C 2
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| CN2012103171347A CN102854117A (en) | 2012-08-31 | 2012-08-31 | Optoelectronic signal acquisition and conversion device for sensor used for detecting dust concentration |
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| CN2012103171347A CN102854117A (en) | 2012-08-31 | 2012-08-31 | Optoelectronic signal acquisition and conversion device for sensor used for detecting dust concentration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241796A (en) * | 2015-10-26 | 2016-01-13 | 广东奥迪威传感科技股份有限公司 | Dust detection apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120055233A1 (en) * | 2010-09-07 | 2012-03-08 | Honda Motor Co., Ltd. | Particulate matter detection device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120055233A1 (en) * | 2010-09-07 | 2012-03-08 | Honda Motor Co., Ltd. | Particulate matter detection device |
Non-Patent Citations (4)
| Title |
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| 《中国优秀博硕士学位论文全文数据库（硕士）》 20040315 田贻丽 "粉尘浓度测量方法的研究" 第1-49页 1 , 第1期 * |
| 《中国优秀硕士学位论文全文数据库》 20120315 栾兴华 "微弱光信号放大采集系统方案的设计" 第15-31页 1 , 第3期 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241796A (en) * | 2015-10-26 | 2016-01-13 | 广东奥迪威传感科技股份有限公司 | Dust detection apparatus |
| CN105241796B (en) * | 2015-10-26 | 2018-02-23 | 广东奥迪威传感科技股份有限公司 | Dust investigating |
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Application publication date: 20130102 |