CN103411634A - Intelligent background suppression photoelectric sensor - Google Patents
Intelligent background suppression photoelectric sensor Download PDFInfo
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- CN103411634A CN103411634A CN2012104907945A CN201210490794A CN103411634A CN 103411634 A CN103411634 A CN 103411634A CN 2012104907945 A CN2012104907945 A CN 2012104907945A CN 201210490794 A CN201210490794 A CN 201210490794A CN 103411634 A CN103411634 A CN 103411634A
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Abstract
Disclosed is an intelligent background suppression photoelectric sensor which relates to the field of photoelectric sensor technology. A side of an emission lens of the intelligent background suppression photoelectric sensor is provided with an LED emission tube. An anode of the LED emission tube is connected to a power supply, and a cathode of the LED emission tube is connected to an end of a first phase and assignment controlled current source. The phase A of the first phase and assignment controlled current source is connected to an end of a clock source. The other end of the clock source is connected to the phase B of a second phase and assignment controlled current source. An IO end of the second phase and assignment controlled current source is connected separately to a signal conditioning circuit and an amplitude comparator. An end of the second phase and assignment controlled current source is connected to a cathode of an LED compensation emission tube, and an anode of the LED compensation emission tube is connected to the power supply. The intelligent background suppression photoelectric sensor can be resistant to hard light interference, can set different emission current strength according to the distance of a target when the distance is set and reduce distance attenuation while the sensor is detecting an object of low reflectivity at a distance.
Description
Technical field:
The present invention relates to the photoelectric sensor technical field, be specifically related to intelligent background and suppress photoelectric sensor.
Background technology:
The background suppression type photoelectric sensor, testing result only with detect distance dependent, and it is irrelevant with color of object surface and reflecting rate, go for detecting the dark-coloured objective body of bright color background surface, because the color of target detection thing is different with reflecting rate, select the conventional scattered reflection type sensor can't reliable detection in a lot of occasions.
On market, existing background suppresses optical sensor, and following two kinds of design proposals are arranged:
The first is to adopt mechanical type to regulate receiver lens, receiving device is the double reception photodiode, its ultimate principle is: receiver is divided into remote area and proximal end region, different far and near objective bodies be reflected back light in the intensity in far and near zone by difference, when the proximal end region receiving light power is greater than far-end, for objective body being detected, could change the detection distance by regulating receiver lens.This scheme can't realize the automatic setting of distance, uses inconvenience.
Another is that electronic type is regulated, adopt position transducer PSD to realize, this scheme can realize the automatic adjusting of distance in theory, but circuit is realized high cost, can't be applied in sensor field, therefore the sensor distance adjusting of existing this scheme of use is still to adopt the potentiometer mode.
As shown in Figure 1, existing background suppresses photoelectric sensor by firing pulse generator 1, transmitter 2, detected material 3, the positional information that PSD position transducer 4 will receive luminous point converts two-way current signal I1 and I2 to, two-way pre-amplification circuit 5 realizes that electric current turns voltage and carries out the signal amplification, binary channels synchronous ADC circuit 6 is realized the synchronous acquisition of signal by the ADC passage of CH1 and CH2, be translated into digital quantity, SPI serial data collection interface 7 sends digital quantity signal to MCU, 8 pairs of data-signals of MCU micro-chip processor carry out calculation process, opener electrode output circuit 9 output measuring-signals.
There is in sum following shortcoming: one, higher to installing and using environmental requirement.The power of surround lighting can directly affect receiver sensitivity, and surround lighting is crossed the testing result that can affect by force sensor, usually uses below 5000Lux; When surround lighting changed, sensor needed calibration;
Two, distance adjustment need to be used potentiometer, and signal amplifies front end to be placed potentiometer and can introduce noise, product be the decline of shell protection grade, and can't meet the regulatory demand of intellectualizing system;
Three, transmitter current intensity mostly is fixed value, when detecting distant objects, because the object to be detected reflected signal is very faint, making sensor detect stability weakens, objective body to low reflecting rate, for example reflecting rate is that 6% black objects health check-up is surveyed the inspection result certain decay is arranged, and black and white colour sensitivity attenuation range is between 10% to 30% usually.
Summary of the invention:
The purpose of this invention is to provide intelligent background and suppress photoelectric sensor, it can resist intense laser interfere, can be according to the distance of object when distance is set, set different transmitter current intensity, and having reduced the range attenuation of sensor when detecting the low reflecting rate object in distant place, the black and white colour sensitivity decays<10%.
In order to solve the existing problem of background technology, the present invention adopts following technical scheme: it comprises diversing lens 11, the first phase place and assignment controllable current source 12, clock source 13, the second phase place and assignment controllable current source 14, magnitude comparator 15, pre-amplification circuit 16, lightguide 17, PSD position transducer 18, receiver lens 19, LED power valve S, LED compensate for emission pipe C, one side of diversing lens 11 is provided with LED power valve S, the positive pole of LED power valve S connects power supply, the negative pole of LED power valve S is connected with an end of the first phase place and assignment controllable current source 1, the A phase of the first phase place and assignment controllable current source 1 is connected with an end of clock source 13, the other end of clock source 13 is connected with the B of the second phase place and assignment controllable current source 14, the IO of the second phase place and assignment controllable current source 14 end respectively with signal conditioning circuit, magnitude comparator 15 connects, one end of the second phase place and assignment controllable current source 14 is connected with the negative pole of LED compensate for emission pipe C, the positive pole of LED compensate for emission pipe C is connected with power supply, LED compensate for emission pipe C matches with lightguide 17, one side of lightguide 17 is provided with PSD position transducer 18, one side of PSD position transducer 18 is provided with receiver lens 19, the I1 pin of PSD position transducer 18, the I2 pin is connected with pre-amplification circuit 16 respectively.
The destruction source of the dynamic balancing state that the present invention compensates due to system self-correcting mechanism is from all impacts in environment, the displacement information that has not only comprised testee, also comprised the impact of the dynamically balanced factors of all destructions such as surround lighting, temperature variation, therefore, system possesses extremely strong anti-interference.
The present invention has realized that background suppresses the intellectuality of photoelectric sensor, except the above-mentioned function of setting, self-correcting etc. certainly, also possesses communication function, can by communication interface, send master system to by detecting data, make sensor go for the occasion that site environment is severe and need to regulate, and intelligent control system, need the Real-time Obtaining sensor information, and sensor parameters is regulated, and the signal conditioning circuit cost is only 20% of former scheme in addition, and the market sight is huge.
The present invention has following beneficial effect: one, anti-intense laser interfere, and sensor can be used in the occasion of ambient light intensity as 200000Lux, thoroughly solved existing background and suppressed photoelectric sensor and can't be suitable for the shortcoming with the high light environment; (daylight environment: under the fine day high light in summer of open air, illumination is 200000Lux);
Two, changed traditional background inhibition photoelectric sensor and must rely on potentiometer to carry out distance adjustment, had intelligent from setting, self-correcting function;
Three, sensor can be according to the distance of object when distance is set, set different transmitter current intensity, make up existing sensor design defect in this regard, and reduced the range attenuation of sensor when detecting the low reflecting rate object in distant place, black and white colour sensitivity decay<10%.
The accompanying drawing explanation:
Fig. 1 is the structural representation of background technology,
Fig. 2 is structural representation of the present invention,
Fig. 3 is the optical triangulation range measurement principle figure of emission light path in this embodiment,
Fig. 4 is applied to the schematic diagram of PSD device signal conditioning for this embodiment.
Embodiment:
Referring to Fig. 2, this embodiment adopts following technical scheme: it comprises diversing lens 11, the first phase place and assignment controllable current source 12, clock source 13, the second phase place and assignment controllable current source 14, magnitude comparator 15, pre-amplification circuit 16, lightguide 17, PSD position transducer 18, receiver lens 19, LED power valve S, LED compensate for emission pipe C, one side of diversing lens 11 is provided with LED power valve S, the positive pole of LED power valve S connects power supply, the negative pole of LED power valve S is connected with an end of the first phase place and assignment controllable current source 1, the A phase of the first phase place and assignment controllable current source 1 is connected with an end of clock source 13, the other end of clock source 13 is connected with the B of the second phase place and assignment controllable current source 14, the IO of the second phase place and assignment controllable current source 14 end respectively with signal conditioning circuit, magnitude comparator 15 connects, one end of the second phase place and assignment controllable current source 14 is connected with the negative pole of LED compensate for emission pipe C, the positive pole of LED compensate for emission pipe C is connected with power supply, LED compensate for emission pipe C matches with lightguide 17, one side of lightguide 17 is provided with PSD position transducer 18, one side of PSD position transducer 18 is provided with receiver lens 19, the I1 pin of PSD position transducer 18, the I2 pin is connected with pre-amplification circuit 16 respectively.
Referring to Fig. 3, if emission of light is blocked by testee 21, reflex to the remote location of PSD, if light is blocked by testee 22, reflex to the center of leaning on of PSD, if light is blocked by testee 23, reflex to the proximal location of PSD, according to the detection principle of PSD device to facula position, sensor can detect the distance of testee, and the color shape of its testing result and object etc. are irrelevant, can realize the background inhibit feature.
Referring to Fig. 4, this embodiment has following characteristics: one, increased the compensate for emission pipe newly, the compensate for emission pipe is by the driven with current sources conducting, it is one group of pulse anti-phase with source power valve control signal, the phase phasic difference is 180 ° each other, when LED power valve S conducting, PSD receives the signal by the object reflection, when LED compensate for emission pipe C conducting, what PSD received is the compensating signal through the lightguide conduction, signal is after receiving preposition amplification, compare twice amplitude, HALIOS system key is the stack by amplitude signal, signal after making to superpose reaches dynamic balancing state.When the signal from outside and interference caused dynamic balancing state to be destroyed, the system automatic calibration, constantly regulated the compensate for emission electric current, according to how many judgement PSD of compensation rate, receives the power of signal I1 and I2;
Two, implementation procedure need to be carried out time-division processing to signal, uses two or more Loop, and each Loop refers to a multi pulse detection cycle, and I1 enters the AN end, in Loop1, carries out data acquisition, and I2 enters the KA end, in Loop2, carries out data acquisition.
The destruction source of the dynamic balancing state that this embodiment compensates due to system self-correcting mechanism is from all impacts in environment, the displacement information that has not only comprised testee, also comprised the impact of the dynamically balanced factors of all destructions such as surround lighting, temperature variation, therefore, system possesses extremely strong anti-interference.
This embodiment has realized that background suppresses the intellectuality of photoelectric sensor, except the above-mentioned function of setting, self-correcting etc. certainly, also possesses communication function, can by communication interface, send master system to by detecting data, make sensor go for the occasion that site environment is severe and need to regulate, and intelligent control system, need the Real-time Obtaining sensor information, and sensor parameters is regulated, the signal conditioning circuit cost is only 20% of former scheme in addition, and the market sight is huge.
This embodiment has following beneficial effect: one, anti-intense laser interfere, and sensor can be used in the occasion of ambient light intensity as 200000Lux, thoroughly solved existing background and suppressed photoelectric sensor and can't be suitable for the shortcoming with the high light environment; (daylight environment: under the fine day high light in summer of open air, illumination is 200000Lux);
Two, changed traditional background inhibition photoelectric sensor and must rely on potentiometer to carry out distance adjustment, had intelligent from setting, self-correcting function;
Three, sensor can be according to the distance of object when distance is set, set different transmitter current intensity, make up existing sensor design defect in this regard, and reduced the range attenuation of sensor when detecting the low reflecting rate object in distant place, black and white colour sensitivity decay<10%.
Claims (1)
1. intelligent background suppresses photoelectric sensor, it is characterized in that it comprises diversing lens (11), the first phase place and assignment controllable current source (12), clock source (13), the second phase place and assignment controllable current source (14), magnitude comparator (15), pre-amplification circuit (16), lightguide (17), PSD position transducer (18), receiver lens (19), LED power valve (S), LED compensate for emission pipe (C), one side of diversing lens (11) is provided with LED power valve (S), the positive pole of LED power valve (S) connects power supply, the negative pole of LED power valve (S) is connected with an end of the first phase place and assignment controllable current source (1), the A phase of the first phase place and assignment controllable current source (1) is connected with an end of clock source (13), the other end of clock source (13) is connected with the B of the second phase place and assignment controllable current source (14), the IO of the second phase place and assignment controllable current source (14) end respectively with signal conditioning circuit, magnitude comparator (15) connects, one end of the second phase place and assignment controllable current source (14) is connected with the negative pole of LED compensate for emission pipe (C), the positive pole of LED compensate for emission pipe (C) is connected with power supply, LED compensate for emission pipe (C) matches with lightguide (17), one side of lightguide (17) is provided with PSD position transducer (18), one side of PSD position transducer (18) is provided with receiver lens (19), the I1 pin of PSD position transducer (18), the I2 pin is connected with pre-amplification circuit (16) respectively.
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| CN2012104907945A CN103411634A (en) | 2012-11-28 | 2012-11-28 | Intelligent background suppression photoelectric sensor |
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| CN2012104907945A CN103411634A (en) | 2012-11-28 | 2012-11-28 | Intelligent background suppression photoelectric sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116558553A (en) * | 2023-07-07 | 2023-08-08 | 深圳市华众自动化工程有限公司 | Small background suppression photoelectric sensor |
Citations (6)
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| US4849781A (en) * | 1986-12-27 | 1989-07-18 | Olympus Optical Co., Ltd. | Range detector |
| CN1101985A (en) * | 1993-06-29 | 1995-04-26 | 株式会社伊奈斯 | Range sensor suitable for a sanitary device |
| CN1806168A (en) * | 2003-04-15 | 2006-07-19 | 医药及科学传感器公司 | System and method for attenuating the effect of ambient light on an optical sensor |
| EP2405283A1 (en) * | 2010-07-06 | 2012-01-11 | Mechaless Systems GmbH | Optoelectronic measuring assembly with a compensation light source |
| WO2012013757A1 (en) * | 2010-07-30 | 2012-02-02 | Mechaless Systems Gmbh | Opto-electronic measuring arrangement with electro-optical basic coupling |
| CN203037271U (en) * | 2012-11-28 | 2013-07-03 | 上海兰宝传感科技股份有限公司 | Intelligent background inhibition photoelectric sensor |
-
2012
- 2012-11-28 CN CN2012104907945A patent/CN103411634A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4849781A (en) * | 1986-12-27 | 1989-07-18 | Olympus Optical Co., Ltd. | Range detector |
| CN1101985A (en) * | 1993-06-29 | 1995-04-26 | 株式会社伊奈斯 | Range sensor suitable for a sanitary device |
| CN1806168A (en) * | 2003-04-15 | 2006-07-19 | 医药及科学传感器公司 | System and method for attenuating the effect of ambient light on an optical sensor |
| EP2405283A1 (en) * | 2010-07-06 | 2012-01-11 | Mechaless Systems GmbH | Optoelectronic measuring assembly with a compensation light source |
| WO2012013757A1 (en) * | 2010-07-30 | 2012-02-02 | Mechaless Systems Gmbh | Opto-electronic measuring arrangement with electro-optical basic coupling |
| CN203037271U (en) * | 2012-11-28 | 2013-07-03 | 上海兰宝传感科技股份有限公司 | Intelligent background inhibition photoelectric sensor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116558553A (en) * | 2023-07-07 | 2023-08-08 | 深圳市华众自动化工程有限公司 | Small background suppression photoelectric sensor |
| CN116558553B (en) * | 2023-07-07 | 2023-09-22 | 深圳市华众自动化工程有限公司 | Small background suppression photoelectric sensor |
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Application publication date: 20131127 |