CN201138324Y - Photoelectric coal dust concentration sensor in rare diffusing type - Google Patents
Photoelectric coal dust concentration sensor in rare diffusing type Download PDFInfo
- Publication number
- CN201138324Y CN201138324Y CNU2007200330666U CN200720033066U CN201138324Y CN 201138324 Y CN201138324 Y CN 201138324Y CN U2007200330666 U CNU2007200330666 U CN U2007200330666U CN 200720033066 U CN200720033066 U CN 200720033066U CN 201138324 Y CN201138324 Y CN 201138324Y
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- photoelectric
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- coal dust
- dust concentration
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Abstract
The utility model discloses a backscattering photoelectric smut concentration sensor. The photoelectric detection part thereof includes an emitting circuit which composed of a light transmitter and an emitting lens, a receive circuit consisting of an optical receiver and a receiving lens, and a circuit board. The photoelectric detection part is arranged at the upper part of the inner side of an explosion preventing shell. The top of the explosion preventing shell is provided with an opening sealed by a light inlet window. The emitting circuit and the receiving circuit are arranged symmetrically left and right and the optical axes between the two circuits intersect outside the light inlet window. The angle between respective optical axis and symmetry axis is between 5 degrees and 20 degrees. The circuit board is provided with a modulation circuit modulating the light source emitted by the light transmitter and a demodulation circuit demodulating the signals received by the optical receiver. The utility model has simple structure and small size. The detecting area is located outside the shell and the outside smut can be detected accurately. The detection is more direct and the detection data is more accurate. Both the structural space and the detection performance problems of the sensor are solved.
Description
Technical field
The utility model relates to the photoelectric sensor technical field, particularly relates to a kind of back scattering type photoelectric coal dust concentration sensor that is applicable in coal mining and the cement industry.
Background technology
When detecting coal dust concentration with optical method both at home and abroad at present, adopt transmission beam method and scattering method mostly.But its radiating portion and receiving unit are positioned at respectively and are detected the both sides, district, and volume is bigger, and range of application is restricted.For scattering method, the coal dust concentration sensor can be divided into the two-way dispersion type that preceding scatter-type, back scattering type combine with front and back according to the optical reflection principle.When the angle between the optical axis that the axis of the light that optical transmitting set sends and optical receiver receive is between 90-180 °, be preceding scatter-type; When the angle between the optical axis that the axis of the light that optical transmitting set sends and optical receiver receive is between 0-90 °, be back scattering type.Intersection between the emission light path of optical transmitting set and the receiving light path of optical receiver is a detecting area, and the volume size of coal dust concentration sensor integral body directly is decided by the full-size of detecting area.Thereby traditional sensor detecting area all is positioned at enclosure interior, and overall volume is all bigger.Especially back scattering type photoelectric coal dust concentration sensor, scattering angle is more little, and just big more to the response output of flue dust, especially the response characteristic to coal dust is good more.Thereby, just need less scattering angle for improving the response performance of sensor, just must increase its volume; For reduced volume to increase scattering angle, just must weaken response performance.In a word, can not be taken into account between the structure space of sensor and the response performance.
The utility model content
Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of back scattering type photoelectric coal dust concentration sensor is provided, it is simple in structure and volume is small and exquisite, detecting area is positioned at outside the whole sensor housing, makes the effective solution that gets both of sensor construction space and detection performance.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of back scattering type photoelectric coal dust concentration sensor, its photoelectric detection part comprises the launching circuit that optical transmitting set 3 and diversing lens 4 are formed, receiving loop and wiring board 10 that optical receiver 7 and receiver lens 4 are formed, described photoelectric detection part is installed in the inside upper part of explosion-proof casing 9, explosion-proof casing 9 top correspondences are provided with opening and adopt light inlet window 8 to seal, described launching circuit and receiving loop left-right symmetric are laid, the optical axis intersection of the two is 5-20 in the angle between optical axis and the axis of symmetry outside the light inlet window 8 and separately, and wiring board 10 is provided with optical transmitting set 3 is sent light source modulation circuit of modulating 18 and the demodulator circuit 13 that optical receiver 7 received signals are carried out demodulation.
As a kind of preferred version of the present utility model, described explosion-proof casing 9 inner corresponding launching circuits and receiving loop are provided with base 1, and optical transmitting set 3 all is fixedly mounted on the base 1 by fixed support with receiver lens 4 with diversing lens 4 and optical receiver 7.
As another kind of preferred version of the present utility model, described light inlet window 8 is a dustproof glass.
As another preferred version of the present utility model, also be provided with amplifying circuit 12, A/D change-over circuit 14, main control chip 15 and display circuit 17 on the described wiring board 10, the received signal of optical receiver 7 inputs to demodulator circuit 13 again after amplifying circuit 12 amplifies, behind A/D change-over circuit 14, import main control chip 15 through the signal that demodulator circuit 13 demodulates, main control chip 16 shows testing result by the display circuit 17 that joins with it synchronously through after the internal arithmetics, simultaneously main control chip in real time with detected dust concentration signal conveys to host computer 16.
To sum up, adopt a kind of back scattering type photoelectric coal dust of the utility model concentration sensor, have the following advantages: 1, build is small and exquisite, simple in structure, compact and reasonable; 2, the highly sensitive and good seal performance of sensor itself, this body structure is little to the influence of test environment coal dust, especially the coal dust of disperse shape; 3, easy and simple to handle, practical, its detecting area is located at outside the whole sensor housing, can be directly to external world coal dust make more exactly and detecting, do not need in advance tested flue dust etc. is pumped to the detecting chamber that is positioned at enclosure interior by specialized equipment; 4, detection is more direct, and it is more accurate to detect data, because its detecting area is positioned at outside the whole housing, can directly detect; 5, dispose explosion-proof casing, security performance is higher.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the utility model back scattering type photoelectric coal dust concentration sensor.
Fig. 2 is the structural representation of this practical new photoelectric detection part.
Fig. 3 is the structural representation of the utility model detecting area part.
Fig. 4 is the circuit block diagram of the utility model wiring board part.
Description of reference numerals:
The 1-base; 2-launches support; The 3-optical transmitting set;
The 4-diversing lens; The 5-receiver lens; The 6-receiving tray;
The 7-optical receiver; The 8-dustproof glass; The 9-explosion-proof casing;
The 10-wiring board; The 11-detecting area; The 12-amplifying circuit;
The 13-demodulator circuit; The 14-A/D change-over circuit; The 15-main control chip;
The 16-host computer; The 17-display circuit; The 19-oscillatory circuit.
Embodiment
As shown in Figure 1, described back scattering type photoelectric coal dust concentration sensor, its photoelectric detection part comprises launching circuit of being made up of optical transmitting set 3 and diversing lens 4 and receiving loop and the wiring board of being made up of optical receiver 7, receiver lens 4 10, and photoelectric detection part is installed in the inside upper part of explosion-proof casing 9.In conjunction with Fig. 2, explosion-proof casing 9 inner corresponding launching circuits and receiving loop are provided with base 1, and optical transmitting set 3 is fixedly mounted on the base 1 by emission support 2, receiving tray 6 respectively with receiver lens 4 with diversing lens 4, optical receiver 7.While explosion-proof casing 9 tops are provided with opening and adopt light inlet window 8 is that dustproof glass seals, and launching circuit and receiving loop left-right symmetric are laid.Wiring board 10 is provided with optical transmitting set 3 is sent the demodulator circuit 13 that light source modulation circuit of modulating 18 and the corresponding signal that optical receiver 7 is received carry out demodulation.
As shown in Figure 4, also be provided with amplifying circuit 12, A/D change-over circuit 14, main control chip 15 and display circuit 17 on the wiring board 10.The received signal of optical receiver 7 inputs to demodulator circuit 13 again after amplifying circuit 12 amplifies, import main control chip 15 again through the signal that demodulator circuit 13 demodulates behind A/D change-over circuit 14.Main control chip 16 shows testing result by the display circuit 17 that joins with it synchronously through after the internal arithmetic, can directly read test result from this display circuit 17, simultaneously main control chip in real time with detected dust concentration signal conveys to host computer 16.In this circuit, be respectively each power circuit by power pack power supply is provided, oscillatory circuit 19 provides vibration source for modulation circuit 18 simultaneously.Be positioned at outside the explosion-proof casing 9 just because of its detecting area 11, inevitably will be subjected to the influence of extraneous parasitic light,, in radiating circuit, added the optical modulating circuit 18 of conventional use, light is changed by certain natural frequency in order to eliminate this influence.After receiving light path received scattered light signal, 13 of demodulator circuits that uses by routine came out the modulated light signal demodulation that changes with natural frequency in the radiating circuit.Like this, just solved the problem of interference of stray light.
As shown in Figure 3, optical axis intersection between launching circuit and the receiving loop is between 5-20 ° in the angle α between optical axis and the axis of symmetry outside the light inlet window 8 and separately, the explosion-proof casing 9 that the two formed detecting area 11 is positioned at whole back scattering type photoelectric coal dust concentration sensor is that light inlet window 8 is outside the dustproof glass, zone among the figure between NN ' MM ' is detecting area 11, and the visible different formed detecting area 11 of scattering angle is different.Be positioned at outside the whole sensor just because of detecting area 11, sensor can be directly to external world coal dust make more exactly and detecting, do not need in advance tested flue dust etc. is pumped to the detecting chamber that is positioned at enclosure interior by specialized equipment.Thereby its detection is more direct relatively, and it is more accurate to detect data.
It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (4)
1. back scattering type photoelectric coal dust concentration sensor, its photoelectric detection part comprises the launching circuit that optical transmitting set (3) and diversing lens (4) are formed, receiving loop and wiring board (10) that optical receiver (7) and receiver lens (4) are formed, it is characterized in that: described photoelectric detection part is installed in the inside upper part of explosion-proof casing (9), explosion-proof casing (9) top correspondence is provided with opening and adopts light inlet window (8) to seal, described launching circuit and receiving loop left-right symmetric are laid, the optical axis intersection of the two is 5-20 ° in the angle between optical axis and the axis of symmetry outside the light inlet window (8) and separately, and wiring board (10) is provided with optical transmitting set (3) is sent light source modulation circuit of modulating (18) and the demodulator circuit (13) that optical receiver (7) received signal is carried out demodulation.
2. according to the described back scattering type photoelectric coal dust of claim 1 concentration sensor, it is characterized in that: inner corresponding launching circuit of described explosion-proof casing (9) and receiving loop are provided with base (1), and optical transmitting set (3) all is fixedly mounted on the base (1) by fixed support with receiver lens (4) with diversing lens (4) and optical receiver (7).
3. according to claim 1 or 2 described back scattering type photoelectric coal dust concentration sensors, it is characterized in that: described light inlet window (8) is a dustproof glass.
4. according to claim 1 or 2 described back scattering type photoelectric coal dust concentration sensors, it is characterized in that: also be provided with amplifying circuit (12) on the described wiring board (10), A/D change-over circuit (14), main control chip (15) and display circuit (17), the received signal of optical receiver (7) inputs to demodulator circuit (13) again after amplifying circuit (12) amplifies, behind A/D change-over circuit (14), import main control chip (15) through the signal that demodulator circuit (13) demodulates, main control chip (16) is through showing testing result synchronously by the display circuit (17) that joins with it after the internal arithmetic, simultaneously main control chip in real time with detected dust concentration signal conveys to host computer (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200330666U CN201138324Y (en) | 2007-12-20 | 2007-12-20 | Photoelectric coal dust concentration sensor in rare diffusing type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200330666U CN201138324Y (en) | 2007-12-20 | 2007-12-20 | Photoelectric coal dust concentration sensor in rare diffusing type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201138324Y true CN201138324Y (en) | 2008-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200330666U Expired - Fee Related CN201138324Y (en) | 2007-12-20 | 2007-12-20 | Photoelectric coal dust concentration sensor in rare diffusing type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201138324Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198349A (en) * | 2014-09-17 | 2014-12-10 | 深圳市信诚佳业电子有限公司 | Dust detection device and dust detection method |
| CN106152211A (en) * | 2016-03-29 | 2016-11-23 | 宁波方太厨具有限公司 | A kind of real-time oil smoke concentration monitoring system and application have the lampblack absorber of this system |
| CN109342281A (en) * | 2018-09-13 | 2019-02-15 | 北京雪迪龙科技股份有限公司 | The laser dust monitor and monitoring method of digital modulation and demodulation |
| CN117664816A (en) * | 2024-02-02 | 2024-03-08 | 深圳市美思先端电子有限公司 | External light path particulate matter sensor and particulate matter detection method |
-
2007
- 2007-12-20 CN CNU2007200330666U patent/CN201138324Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198349A (en) * | 2014-09-17 | 2014-12-10 | 深圳市信诚佳业电子有限公司 | Dust detection device and dust detection method |
| CN104198349B (en) * | 2014-09-17 | 2015-08-12 | 深圳市信诚佳业电子有限公司 | Dust investigating and dust detection method |
| CN106152211A (en) * | 2016-03-29 | 2016-11-23 | 宁波方太厨具有限公司 | A kind of real-time oil smoke concentration monitoring system and application have the lampblack absorber of this system |
| CN106152211B (en) * | 2016-03-29 | 2019-02-15 | 宁波方太厨具有限公司 | A kind of real-time oil smoke concentration monitoring system and application have the kitchen ventilator of the system |
| CN109342281A (en) * | 2018-09-13 | 2019-02-15 | 北京雪迪龙科技股份有限公司 | The laser dust monitor and monitoring method of digital modulation and demodulation |
| CN109342281B (en) * | 2018-09-13 | 2021-10-01 | 北京雪迪龙科技股份有限公司 | Laser dust monitor with digital modulation and demodulation and monitoring method |
| CN117664816A (en) * | 2024-02-02 | 2024-03-08 | 深圳市美思先端电子有限公司 | External light path particulate matter sensor and particulate matter detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: XI AN LAOTE ELECTRONIC LIMITED LIABILITY COMPANY Free format text: FORMER OWNER: XI AN LAOTE INFORMATION TECHNOLOGY CO., LTD. Effective date: 20121221 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 710075 XI AN, SHAANXI PROVINCE TO: 710065 XI AN, SHAANXI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20121221 Address after: 710065 Shaanxi city of Xi'an province high tech Zone high two road and building room 612 Patentee after: Xi'an Laote Electronic Limited Liability Company Address before: 710075 Shaanxi Province, Xi'an City High Road No. 25 building 17C enjoye Patentee before: Xi'an Laote Information Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081022 Termination date: 20141220 |
|
| EXPY | Termination of patent right or utility model |