CN102854111B - Dust concentration detector - Google Patents
Dust concentration detector Download PDFInfo
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- CN102854111B CN102854111B CN201210316786.9A CN201210316786A CN102854111B CN 102854111 B CN102854111 B CN 102854111B CN 201210316786 A CN201210316786 A CN 201210316786A CN 102854111 B CN102854111 B CN 102854111B
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Abstract
The invention provides a dust concentration detector, which belongs to the technical field of coal mining facilities. The dust concentration detector 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, 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 voltage follower circuit comprises capacitors C4 and C6, a resistor R6 and a bipolar operational amplifier U3. The dust concentration detector has the advantages of good working stability, strong anti-interference ability, accurate acquisition data, good reliability, etc.
Description
Technical field
the invention belongs to mining facility technology field, be specifically related to a kind of dust concentration detector.
Background technology
under coal mine, dust content is high, and composition is harmful, and workers with long time is worked in dust atmosphere, easily suffers from pneumoconiosis; In dust, contain inflammable and explosive composition, hold fire hazardous 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 meet existing mine monitoring downhole powder dust concentration, utilizes 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, the concentration that can continuous detecting has the dust that swims in the environment of inflammable and explosive inflammable gas potpourri, can under natural airflow state, monitor and show downhole powder dust concentration in real time, on the spot, uninterruptedly, the switching value signal of the device for reducing dust of output and sprinkle water and spray interlock simultaneously, realized the optimum efficiency of dust measuring depositing dust, have measurement quick and precisely, the function and characteristic such as highly sensitive, demonstration on the spot, 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.Colliery subsurface environment is severe, and light is very weak, and the detection accuracy of general photodiode is poor, sensitivity is low, in addition because the current signal collecting 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 subject to strong illumination, be adapted at using under 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 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 and the dust concentration detector of functional reliability excellence is to have at present technical matters to be solved again.
Summary of the invention
the dust concentration detector that the object of this invention is to provide the simple and functional reliability excellence of a kind of circuit structure.
the object of the invention is to reach like this, a kind of dust concentration detector, comprise for exporting the I/V change-over circuit of the first output voltage V out1, for exporting the voltage amplifier circuit of the second output voltage V out2, for exporting voltage follower circuit and the power supply of the 3rd output voltage V out3, introduce 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 and is connected with signal output apparatus with power supply, 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 one end of resistance R 2 and capacitor C 8 connects, 6 pin of utmost point Low-bias Current operational amplifier U1 and one 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, described the first output voltage V out1 is also exported in one end of another termination capacitor C 2 of resistance R 5, 7 pin of utmost point Low-bias Current operational amplifier U1 and one 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 one 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 voltage follower circuit comprises capacitor C 4, C6, resistance R 6 and bipolarity operational amplifier U3, 2 pin of bipolarity operational amplifier U3 connect one 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 one end of capacitor C 4 meet positive direct-current power supply VCC jointly, 4 pin of bipolarity operational amplifier U3 and one 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.
the present invention is owing to having adopted said structure, utilize silicon photocell to replace traditional photodiode or photomultiplier to convert the light signal collecting to electric signal, in I/V change-over circuit, having adopted the utmost point Low-bias Current operational amplifier electric current to be amplified and convert voltage to exports, in voltage amplifier circuit, adopted low noise variable gain instrument amplifier to amplify processing to the voltage of exporting in I/V change-over circuit, 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 make the present invention there is good operating stability, antijamming capability is strong, the advantages such as image data standard and good reliability.
Accompanying drawing explanation
fig. 1 is theory diagram of the present invention.
fig. 2 is the electrical schematic diagram of the I/V change-over circuit shown in Fig. 1.
fig. 3 is the electrical schematic diagram of the voltage amplifier circuit shown in Fig. 1.
fig. 4 is the electrical schematic diagram of the voltage follower circuit shown in Fig. 1.
fig. 5 is the power supply introducing shown in Fig. 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, applicant elaborates the mode with embodiment below by reference to the accompanying drawings, but to the description of embodiment, be not all the restriction to the present invention program, any according to the present invention design, done only for pro forma but not substantial equivalent transformation all should be considered as technical scheme category of the present invention.
refer to Fig. 1, a kind of dust concentration detector, 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 direct supply main circuit being provided with signal output apparatus 4 and 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, by power supply, introduce signal Collect conversion being obtained with signal output apparatus 4 and export to subordinate equipment.
refer to 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 coal mine to electric signal, and the marking current Is of collection 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 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 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)
refer to 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 I/V change-over circuit 1 output described in the input termination of circuit, resistance R 1, R4 amplify resistance as ratio, capacitor C 5, C7 play 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。
refer to 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 are connected and do feedback use, and capacitor C 4, C6 play power supply filter action, and resistance R 6 is current-limiting resistance, by this resistance output the 3rd output voltage V out3.
refer to 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 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 prior art, has reached goal of the invention, has embodied the technique effect described in applicant.
Claims (1)
1.
a kind of dust concentration detector, it is characterized in that comprising for exporting the I/V change-over circuit (1) of the first output voltage V out1, for exporting the voltage amplifier circuit (2) of the second output voltage V out2, for exporting voltage follower circuit (3) and the power supply of the 3rd output voltage V out3, introduce 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 with 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 terminal of voltage follower circuit (3) is introduced and is connected with signal output apparatus (4) with power supply, 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 one end of resistance R 2 and capacitor C 8 connects, 6 pin of utmost point Low-bias Current operational amplifier U1 and one 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, described the first output voltage V out1 is also exported in one end of another termination capacitor C 2 of resistance R 5, 7 pin of utmost point Low-bias Current operational amplifier U1 and one 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 one 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 voltage follower circuit (3) comprises capacitor C 4, C6, resistance R 6 and bipolarity operational amplifier U3, 2 pin of bipolarity operational amplifier U3 connect one 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 one end of capacitor C 4 meet positive direct-current power supply VCC jointly, 4 pin of bipolarity operational amplifier U3 and one 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 voltage amplifier circuit (2) comprises resistance R 1, R4, capacitor C 5, C7 and low noise variable gain instrument amplifier U2, 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 I/V change-over circuit (1) output described in the input termination of circuit, resistance R 1, R4 amplify resistance as ratio, capacitor C 5, C7 play power supply filter action, and 6 pin of low noise variable gain instrument amplifier U2 are exported the second output voltage V out2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210316786.9A CN102854111B (en) | 2012-08-31 | 2012-08-31 | Dust concentration detector |
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| CN201210316786.9A CN102854111B (en) | 2012-08-31 | 2012-08-31 | Dust concentration detector |
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| CN102854111B true CN102854111B (en) | 2014-03-05 |
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| CN105938082B (en) * | 2016-05-26 | 2019-05-17 | 江汉大学 | A kind of driving circuit and personal sampler of personal sampler |
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| US4110604A (en) * | 1976-11-04 | 1978-08-29 | Becton, Dickinson And Company | Particle density measuring system |
| US4203100A (en) * | 1977-05-23 | 1980-05-13 | Hochiki Corporation | Light decrease type smoke sensor |
| JP3928347B2 (en) * | 2000-10-10 | 2007-06-13 | 富士電機システムズ株式会社 | Electronic circuit for particle counter turbidimeter and particle counter |
| CN201512547U (en) * | 2009-10-14 | 2010-06-23 | 青岛科联环保仪器有限公司 | Integrated dry cloth bag dust removing on-line monitoring device for large-scale blast furnace gas |
| CN201876435U (en) * | 2010-12-10 | 2011-06-22 | 青岛环瑞机电科技有限公司 | Dust content on-line monitoring device for bag-type dust removal |
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