CN102866090A - Dust concentration detection sensor used for coal mine - Google Patents
Dust concentration detection sensor used for coal mine Download PDFInfo
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- CN102866090A CN102866090A CN201210317178XA CN201210317178A CN102866090A CN 102866090 A CN102866090 A CN 102866090A CN 201210317178X A CN201210317178X A CN 201210317178XA CN 201210317178 A CN201210317178 A CN 201210317178A CN 102866090 A CN102866090 A CN 102866090A
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Abstract
A dust concentration detection sensor used for a coal mine belongs to the technical field of mine safety facilities. The dust concentration detection sensor comprises a current/voltage (I/V) conversion circuit, a voltage amplification circuit, a voltage following circuit and a power input and signal output circuit, wherein the output end of the power supply input and signal output circuit is connected with the I/V conversion circuit, the voltage amplification circuit and the voltage following circuit, the output end of the I/V conversion circuit is connected with the voltage amplification circuit, the output end of the voltage amplification circuit is connected with the voltage following circuit, the output end of the voltage following circuit is connected with the power input and signal output circuit, the voltage amplification circuit comprises resistors R1 and R4, capacitors C5 and C7 and a low-noise variable gain instrument amplifier U2, the voltage following circuit comprises capacitors C4 and C6, a resistor R6 and a bipolar operational amplifier U3, and the power supply input and signal output circuit comprises a socket J1, a capacitor C9, a capacitor C10 and a resistor R7. The working stability is good, the interference resistance is strong, the collected data is accurate and the reliability is good.
Description
Technical field
The invention belongs to mine safety facility technology field, be specifically related to the dust concentration detecting sensor that use in a kind of colliery
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 dust concentration detecting sensor that uses in the colliery of functional reliability excellence has positive effect
Summary of the invention
The purpose of this invention is to provide that a kind of circuit design is simple, the dust concentration detecting sensor of stable work in work, measurement effect is good and functional reliability is excellent colliery use.
The objective of the invention is to reach like this, the dust concentration detecting sensor that use in a kind of colliery, 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 voltage amplifier circuit comprises resistance R 1, R4, capacitor C 5, C7 and low noise variable gain instrument amplifier U2, the end of the 1 pin connecting resistance R1 of low noise variable gain instrument amplifier U2, the end of the other end connecting resistance R4 of resistance R 1,8 pin of another termination low noise variable gain instrument amplifier U2 of resistance R 4,3 pin of low noise variable gain instrument amplifier U2 meet the first output voltage V out1 of described I/V change-over circuit output, 6 pin of low noise variable gain instrument amplifier U2 are exported described the second output voltage V out2,7 pin of low noise variable gain instrument amplifier U2 and an end of capacitor C 5 meet positive direct-current power supply VCC jointly, 4 pin of low noise variable gain instrument amplifier U2 and an end of capacitor C 7 meet negative direct supply-VCC, the other end of capacitor C 5 jointly, 2 of the other end of capacitor C 7 and low noise variable gain instrument amplifier U2,5 pin common grounds; Described voltage follower circuit comprises capacitor C 4, C6, resistance R 6 and bipolarity operational amplifier U3,2 pin of bipolarity operational amplifier U3 connect an end of 6 pin and resistance R 6, the other end of resistance R 6 is exported described the 3rd output voltage V out3,3 pin of bipolarity operational amplifier U3 meet the second output voltage V out2 of described voltage amplifier circuit output, 7 pin of bipolarity operational amplifier U3 and an end of capacitor C 4 meet positive direct-current power supply VCC jointly, 4 pin of bipolarity operational amplifier U3 and an end of capacitor C 6 meet negative direct supply-VCC jointly, the other end common ground of the other end of capacitor C 4 and capacitor C 6; Described power supply is introduced with signal output apparatus 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 outputs, 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, the dust concentration detecting sensor that use in a kind of colliery, 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.
The dust concentration detecting sensor that use in a kind of colliery, 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 voltage amplifier circuit (2) comprises resistance R 1, R4, capacitor C 5, C7 and low noise variable gain instrument amplifier U2, the end of the 1 pin connecting resistance R1 of low noise variable gain instrument amplifier U2, the end of the other end connecting resistance R4 of resistance R 1,8 pin of another termination low noise variable gain instrument amplifier U2 of resistance R 4,3 pin of low noise variable gain instrument amplifier U2 meet the first output voltage V out1 of described I/V change-over circuit (1) output, 6 pin of low noise variable gain instrument amplifier U2 are exported described the second output voltage V out2,7 pin of low noise variable gain instrument amplifier U2 and an end of capacitor C 5 meet positive direct-current power supply VCC jointly, 4 pin of low noise variable gain instrument amplifier U2 and an end of capacitor C 7 meet negative direct supply-VCC, the other end of capacitor C 5 jointly, 2 of the other end of capacitor C 7 and low noise variable gain instrument amplifier U2,5 pin common grounds; Described voltage follower circuit (3), comprise capacitor C 4, C6, resistance R 6 and bipolarity operational amplifier U3,2 pin of bipolarity operational amplifier U3 connect an end of 6 pin and resistance R 6, the other end of resistance R 6 is exported described the 3rd output voltage V out3,3 pin of bipolarity operational amplifier U3 meet the second output voltage V out2 of described voltage amplifier circuit (2) output, 7 pin of bipolarity operational amplifier U3 and an end of capacitor C 4 meet positive direct-current power supply VCC jointly, 4 pin of bipolarity operational amplifier U3 and an end of capacitor C 6 meet negative direct supply-VCC jointly, the other end common ground of the other end of capacitor C 4 and capacitor C 6; 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
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210317178XA CN102866090A (en) | 2012-08-31 | 2012-08-31 | Dust concentration detection sensor used for coal mine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210317178XA CN102866090A (en) | 2012-08-31 | 2012-08-31 | Dust concentration detection sensor used for coal mine |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975733A (en) * | 2010-09-27 | 2011-02-16 | 常熟市矿山机电器材有限公司 | Dust detection system and dust detection circuit |
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- 2012-08-31 CN CN201210317178XA patent/CN102866090A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975733A (en) * | 2010-09-27 | 2011-02-16 | 常熟市矿山机电器材有限公司 | Dust detection system and dust detection circuit |
Non-Patent Citations (3)
| Title |
|---|
| 张君，赵杰: "仪表放大器AD623的性能与应用", 《仪表技术》, no. 5, 31 December 2002 (2002-12-31) * |
| 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 信息科技辑》, no. 3, 15 March 2012 (2012-03-15) * |
| 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） 基础科学辑》, no. 1, 15 March 2004 (2004-03-15) * |
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Application publication date: 20130109 |