CN102854110A - Mining sensor for detection of dust concentration - Google Patents
Mining sensor for detection of dust concentration Download PDFInfo
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- CN102854110A CN102854110A CN2012103167854A CN201210316785A CN102854110A CN 102854110 A CN102854110 A CN 102854110A CN 2012103167854 A CN2012103167854 A CN 2012103167854A CN 201210316785 A CN201210316785 A CN 201210316785A CN 102854110 A CN102854110 A CN 102854110A
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Abstract
The invention provides a mining sensor for detection of dust concentration, which belongs to the technical field of coal mining safety facilities. The sensor comprises an I/V conversion circuit used for outputting a first output voltage, a voltage amplifier circuit used for outputting a second output voltage, a voltage follower circuit used for outputting a third output voltage 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, 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, and the power lead-in and signal output circuit comprises a socket J1, capacitors C9 and C10 and a resistor R7. The mining sensor has the advantages of good working stability, strong anti-interference ability, accurate acquisition data, good reliability, etc.
Description
Technical field
The invention belongs to the coalmining safety facility technical field, be specifically related to a kind of mining dust concentration detecting sensor
Background technology
Dust content is high under the coal mine, and composition is harmful, and workers with long time is worked in dust atmosphere, easily suffers from pneumoconiosis; Contain inflammable and explosive composition in the dust, easily cause 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 easily causes potential safety hazard in the dust work place, and use cost is also higher.
For this reason, can provide that a kind of dust accuracy of detection is high, low cost of manufacture, can use safely again and the mining dust concentration detecting sensor of functional reliability excellence is 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 structure is simple, stable work in work, measurement effect is good and functional reliability is excellent mining dust concentration detecting sensor.
The objective of the invention is to reach like this, a kind of mining dust concentration detecting sensor, 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; Described power supply is introduced and signal output apparatus, comprise socket J1, capacitor C 9, C10 and resistance R 7,1 pin of socket J1 and the positive pole of capacitor C 10 meet positive direct-current power supply VCC jointly, 2 pin of socket J1 and the negative pole of capacitor C 9 meet negative direct supply-VCC jointly, 4 pin of socket J1 meet the 3rd output voltage V out3 of described voltage follower circuit output, be used for connecting subordinate equipment, the other end of the negative pole of the positive pole of capacitor C 9, capacitor C 10, an end of resistance R 7, resistance R 7 and 3, the 5 pin common grounds of socket J1.
The present invention is owing to having 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 the I/V change-over circuit 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 and good reliability.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Fig. 2 is the electrical schematic diagram of I/V change-over circuit shown in Figure 1.
Fig. 3 is the electrical schematic diagram of voltage amplifier circuit shown in Figure 1.
Fig. 4 is the electrical schematic diagram of voltage follower circuit shown in Figure 1.
Fig. 5 is power supply introducing shown in Figure 1 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 mining dust concentration detecting sensor, 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 mining dust concentration detecting sensor, 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; Described power supply is introduced with signal output apparatus (4) and is comprised socket J1, capacitor C 9, C10 and resistance R 7,1 pin of socket J1 and the positive pole of capacitor C 10 meet positive direct-current power supply VCC jointly, 2 pin of socket J1 and the negative pole of capacitor C 9 meet negative direct supply-VCC jointly, 4 pin of socket J1 meet the 3rd output voltage V out3 of described voltage follower circuit (3) output, be used for connecting subordinate equipment, the other end of the negative pole of the positive pole of capacitor C 9, capacitor C 10, an end of resistance R 7, resistance R 7 and 3, the 5 pin common grounds of socket J1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103167854A CN102854110A (en) | 2012-08-31 | 2012-08-31 | Mining sensor for detection of dust concentration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103167854A CN102854110A (en) | 2012-08-31 | 2012-08-31 | Mining sensor for detection of dust concentration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007833A (en) * | 2017-11-20 | 2018-05-08 | 合肥硕佳电子科技有限公司 | A kind of automatic range dust detector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369157A (en) * | 2008-09-25 | 2009-02-18 | 山东科技大学 | Mine dust concentration control device |
| US20120055233A1 (en) * | 2010-09-07 | 2012-03-08 | Honda Motor Co., Ltd. | Particulate matter detection device |
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2012
- 2012-08-31 CN CN2012103167854A patent/CN102854110A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369157A (en) * | 2008-09-25 | 2009-02-18 | 山东科技大学 | Mine dust concentration control device |
| US20120055233A1 (en) * | 2010-09-07 | 2012-03-08 | Honda Motor Co., Ltd. | Particulate matter detection device |
Non-Patent Citations (4)
| Title |
|---|
| 《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 * |
| 栾兴华: ""微弱光信号放大采集系统方案的设计"", 《中国优秀硕士学位论文全文数据库》 * |
| 田贻丽: ""粉尘浓度测量方法的研究"", 《中国优秀博硕士学位论文全文数据库（硕士）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007833A (en) * | 2017-11-20 | 2018-05-08 | 合肥硕佳电子科技有限公司 | A kind of automatic range dust detector |
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Application publication date: 20130102 |