CN103698277A - Differential motion detection method of fine object - Google Patents
Differential motion detection method of fine object Download PDFInfo
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- CN103698277A CN103698277A CN201310656786.8A CN201310656786A CN103698277A CN 103698277 A CN103698277 A CN 103698277A CN 201310656786 A CN201310656786 A CN 201310656786A CN 103698277 A CN103698277 A CN 103698277A
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Abstract
The invention belongs to detection methods, and in particular relates to a differential motion detection method of a fine object. The method is characterized in that a controllable light emitting element is fixed on a base; two photosensitive detection elements are symmetrically arranged on two sides of the controllable light emitting element; an arced reflector is fixed on the opposite side of the base; when the fine object is detected, the controllable light emitting element is controlled by a driving circuit to emit a light beam which twinkles according to specific frequency; the light beam is transmitted to the photosensitive detection elements on two sides through the arced reflector; output signals of the photosensitive detection elements on two sides are respectively processed by a same amplification circuit and a filtering circuit so as to obtain two receiving signals; the two received signals are subtracted so as to obtain an analog signal for expressing a fine object passing event; the analog signal is compared with a preset threshold so as to obtain a pulse signal corresponding to the passing event. According to the detection method, a differential motion technique is adopted for detection, the structure is simple, the scheme is scientific and reasonable, a high anti-interference capability is achieved, and the detection method can be easily popularized and applied to various automatic equipment and instruments.
Description
Technical field
The invention belongs to detection method class, specifically a kind of differential detection method of fine object.
Background technology
Producing and field of scientific study, often need to fine object accurately be detected and be counted, such as the number of turns metering of yarn in textile machine etc.Traditional detection method generally adopts optical detection principle, common are two kinds of modes of photoelectricity correlation and photoelectric reflection, by adopting an active illuminating element to send light beam, light beam by direct projection or reflected illumination to photoelectric coupling receiving element, once fine object enters beam Propagation region, will affect the luminous flux of photoelectric coupling receiving element, thereby cause the amplitude of receiving element output electrical signals to change, and then by judgement amplitude intensity of variation, realize the detection of fine object.In addition, receiving element output signal and predetermined threshold value are compared and can also obtain fine object by the pulse signal of event, then realize that digitizing detects and metering.That said method has is simple in structure, non-contact detecting, significant advantage that cost is low, but also has the limitation that is subject to ambient light interference, circuit parameter drift impact.Be embodied in output signal except comprising the amplitude fluctuations that fine object shading light road causes, also contain the undesired signal that ambient light changes, circuit parameter drift produces.This makes fine object be difficult to determine by the threshold value of event.Threshold value is too small easily causes false triggering, and threshold value is excessive can cause undetected survey again, and then affects accuracy and the reliability of fine object detection.In fine object detection field, also rarely has the reasonable detection scheme that possesses high sensitivity and high reliability at present.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of differential detection method of simple in structure, scientific and reasonable, fine object that antijamming capability is strong is provided.
Technical scheme of the present invention is as follows:
A kind of differential detection method of fine object, it is characterized in that: on a pedestal, fix a controllable luminous element, controllable luminous elements on either side is arranged symmetrically with two sensitization detecting elements, two sensitization detecting elements, controllable luminous element tube ordering is consistent by direction with fine object, the fixing cambered surface reflecting optics on pedestal opposite, fine object is the region between cambered surface reflecting optics and pedestal by path, cambered surface reflecting optics axis overlaps with the light beam that controllable luminous element sends, cambered surface angle guarantees that folded light beam major part exposes to the sensitization detecting element of controllable luminous elements on either side, adopting driving circuit to control controllable luminous element sends by the light beam of characteristic frequency flicker, light beam transfers to the sensitization detecting element of both sides by cambered surface reflecting optics, the output signal of both sides sensitization detecting element obtains two-way after processing by identical amplifying circuit and filtering circuit respectively and receives signal, by having obtained two-way reception signal subtraction, obtain expressing fine object by the simulating signal of event, this simulating signal and predetermined threshold value are compared and obtained with fine object by the corresponding pulse signal of event.
Two sensitization detecting elements of the present invention are arranged symmetrically in controllable luminous elements on either side, and the installation of cambered surface transmitting mirror guarantees that both sides transmitting light path is symmetrical, and surround lighting is consistent on the impact of both sides transmitting light path.
The present invention also can adopt controllable luminous element and sensitization detecting element correlation mounting means, specifically: on a pedestal, fix a controllable luminous element, two sensitization detecting elements are installed on another relative pedestal, and controllable luminous element is consistent by direction with ordering and the fine object shown in arrow of two sensitization detecting elements; Between two sensitization detecting elements, light barrier is installed; Controllable luminous element sends light beam irradiates to a two sensitization detecting element; While carrying out fine object detection, driving circuit is controlled controllable luminous element and is sent by the light beam of characteristic frequency flicker and transfer to both sides sensitization detecting element, the output signal of both sides sensitization detecting element obtains two-way after processing by identical amplifying circuit and filtering circuit respectively and receives signal, two-way is received to signal subtraction and obtain expressing fine object by the simulating signal of event, this simulating signal and predetermined threshold value are compared and obtain the pulse signal corresponding with the event of passing through.
It controls driving circuit of the present invention controllable luminous element to send the flicker frequency of light beam consistent with the frequency response characteristic of sensitization detecting element, and meets the not undetected requirement during by light path with maximal rate of detected fine object.
Two sensitization detecting elements of the present invention receiving circuit is separately positioned at same controller, and circuit parameter drift impact is close.
Controllable luminous element of the present invention can adopt light emitting diode, and sensitization detecting element adopts photoelectric coupling receiving tube.
It is close when not having fine object to pass through that two-way of the present invention receives its amplitude of signal, subtracts each other gained simulating signal amplitude and level off to zero.At fine object, pass through in process, certainly will be successively by the light path that is subject to of two sensitization detecting elements, after amplifying, cause by two-way amplifying circuit two-way to receive signal amplitude instantaneous obviously inconsistent, and make to subtract each other gained and express fine object by instantaneous the enlarging markedly of simulating signal amplitude of event, reach differential detection effect; The present invention is subtracted each other and has been offset ambient light interference impact and circuit parameter drift impact by the output signal that is arranged symmetrically with sensitization detecting element by two, strengthen fine object by the signal to noise ratio (S/N ratio) of simulating signal that event produces, do not relied on stability and the ideal operation environment of single receiving circuit.The present invention adopts differential technique to detect, and simple in structure, scheme is scientific and reasonable, and antijamming capability is strong, is easy to promote the use of in multiple automation equipment and instrument.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention one schematic diagram
Fig. 2 is the embodiment of the present invention two schematic diagram.
Embodiment
As shown in Figure 1, a kind of fine object, by detection method, is characterized in that embodiment mono-:
A, at pedestal one 1 diode installeds 3, photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24, photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 are symmetrically arranged in light emitting diode 3 both sides, light emitting diode 3, photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 orderings with shown in fine object 9 arrows to pass through direction consistent; Between light emitting diode 3 and photoelectric coupling receiving tube 2 and photoelectric coupling receiving tube 24, be separately installed with light barrier 1 and light barrier 26;
B, on pedestal 2 12, with light emitting diode 3 opposite faces, cambered surface catoptrons 11, the dead in line that the axis of cambered surface catoptron 11 and light emitting diode 3 send light beam 7 are installed; The reflected light 1 of light beam 7 exposes to photoelectric coupling receiving tube 1, and the reflection ray 28 of light beam 7 exposes to photoelectric coupling receiving tube 4;
C, light emitting diode 3, photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 are connected to respectively and detect controller 20.Detect in controller 20 and be provided with driving circuit 13, amplifying circuit 2 14, amplifying circuit 1, filtering circuit 2 15, filtering circuit 1 and subtraction circuit 18, wherein driving circuit 13 is connected to light emitting diode 3, photoelectric coupling receiving tube 1 is connected to amplifying circuit 1, photoelectric coupling receiving tube 24 is connected to amplifying circuit 2 14, amplifying circuit 1 is connected to filtering circuit 1, amplifying circuit 2 14 is connected to filtering circuit 2 15, and filtering circuit 1 and filtering circuit 2 15 are connected to subtraction circuit 18;
D, subtraction circuit 18 are connected to threshold value comparison and pulse-scaling circuit 19;
E, start when detecting, driving circuit 13 is controlled light emitting diode 3 and is sent by the light beam 7 of characteristic frequency flicker and expose to cambered surface catoptron 11, its reflection ray 1 and reflection ray 28 expose to respectively photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24, before fine object 9 does not have blocking reflected light 1 and reflection ray 28, filtering circuit 2 15 is close with filtering circuit one 17 output signal amplitudes, subtraction circuit 18 output signals are close to zero, and threshold value comparison and pulse-scaling circuit 19 are not triggered;
When F, fine object 9 move to reflected light path, reflection ray 1 is first blocked and causes filtering circuit one 17 output signal amplitudes to be starkly lower than the output signal amplitude of filtering circuit 2 15, subtraction circuit 18 output signals are from enlarging markedly close to zero condition to a positive polarity voltage value, threshold value comparison and pulse-scaling circuit 19 are triggered, thereby realize, once pass through event detection;
When G, fine object 9 continue to move to the transmission path of light beam 7 and reflection ray 28, will cause successively filtering circuit 1 and filtering circuit 2 15 output signals to diminish, and filtering circuit 2 15 output signal amplitudes are starkly lower than the appearance of filtering circuit one 17 output signal amplitude situations simultaneously; Both of these case can cause the output signal of subtraction circuit 18 to be reduced to continuously zero and reverse voltage value from the positive polarity voltage state of value shown in F, and activation threshold value compares and step-by-step counting 19 again.
Photoelectric coupling receiving tube 1 of the present invention is consistent with photoelectric coupling receiving tube 24 its environment light conditions of living in, by the effective surround lighting that suppressed of subtracting each other of output signal after photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 amplification filtering is changed fine object by the interference detecting.
Amplifying circuit 1 of the present invention, amplifying circuit 2 14, filtering circuit 1, filtering circuit 2 15 are in same detection controller 20, its electrical Interference is close with Physics Work environment, therefore electric parameter drift characteristic is also close, by the effective electric parameter that suppressed of subtracting each other of output signal after photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 amplification filtering is drifted about to fine object by the interference of testing process.
Embodiment bis-
Method of the present invention is also applicable to controllable luminous element and sensitization detecting element correlation mounting means, and embodiment as shown in Figure 2.
A, at pedestal one 1 diode installeds 3, photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 are installed on the pedestal 2 12 relative with pedestal 1, light emitting diode 3, photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 orderings with shown in fine object 9 arrows to pass through direction consistent; Between photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24, be separately installed with light barrier 1 and light barrier 26;
The reflection ray 1 that B, light emitting diode 3 send light beam exposes to sensitization detecting element 1, and reflection ray 28 exposes to sensitization detecting element 4;
C, light emitting diode 3, photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24 are connected to respectively and detect controller 20, detect in controller 20 and be provided with driving circuit 13, amplifying circuit 2 14, amplifying circuit 1, filtering circuit 2 15, filtering circuit 1, and subtraction circuit 18, wherein driving circuit 13 is connected to controllable luminous element 3, photoelectric coupling receiving tube 1 is connected to amplifying circuit 1, photoelectric coupling receiving tube 24 is connected to amplifying circuit 2 14, amplifying circuit 1 is connected to filtering circuit 1, amplifying circuit 2 14 is connected to filtering circuit 2 15, filtering circuit 1 and filtering circuit 2 15 are connected to subtraction circuit 18.
D, subtraction circuit 18 are connected to threshold value comparison and pulse-scaling circuit 19;
E, start when detecting, driving circuit 13 control light emitting diodes 3 send by reflection ray 1 and the reflection ray 28 of characteristic frequency flicker and expose to respectively photoelectric coupling receiving tube 1 and photoelectric coupling receiving tube 24, before fine object 9 does not have blocking reflected light 1 and reflection ray 28, filtering circuit 2 15 is close with filtering circuit one 17 output signal amplitudes, subtraction circuit 18 output signals are close to zero, and threshold value comparison and pulse-scaling circuit 19 are not triggered;
When F, fine object 9 move to reflected light path, reflection ray 1 is first blocked and causes filtering circuit one 17 output signal amplitudes to be starkly lower than the output signal amplitude of filtering circuit 2 15, subtraction circuit 18 output signals are from enlarging markedly close to zero condition to a positive polarity voltage value, threshold value comparison and pulse-scaling circuit 19 are triggered, thereby realize, once pass through event detection;
When G, fine object continue to move to the transmission path of reflection ray 28, will cause successively filtering circuit 1 and filtering circuit 2 15 output signals to diminish, and filtering circuit 2 15 output signal amplitudes are starkly lower than the appearance of filtering circuit one 17 output signal amplitude situations simultaneously; Both of these case can cause the output signal of subtraction circuit 18 to be reduced to continuously zero and reverse voltage value from the positive polarity voltage state of value shown in F, and activation threshold value compares and step-by-step counting 19 again.
Claims (6)
1. the differential detection method of a fine object, it is characterized in that: on a pedestal, fix a controllable luminous element, controllable luminous elements on either side is arranged symmetrically with two sensitization detecting elements, receiving tube, controllable luminous element tube ordering is consistent by direction with fine object, the fixing cambered surface reflecting optics on pedestal opposite, fine object is the region between cambered surface reflecting optics and pedestal by path, cambered surface reflecting optics axle center overlaps with the light beam that controllable luminous element sends, cambered surface angle guarantees that folded light beam major part exposes to the sensitization detecting element of controllable luminous elements on either side, while carrying out fine object by detection, adopting driving circuit to control controllable luminous element sends by the light beam of characteristic frequency flicker, light beam transfers to the sensitization detecting element of both sides by cambered surface reflecting optics, the output signal of both sides sensitization detecting element obtains two-way after processing by identical amplifying circuit and filtering circuit respectively and receives signal, by having obtained two-way reception signal subtraction, obtain expressing fine object by the simulating signal of event, by this simulating signal and default threshold value compare obtain with by the corresponding pulse signal of event.
2. the differential detection method of a fine object, it is characterized in that: on a pedestal, fix a controllable luminous element, two sensitization detecting elements are installed on another relative pedestal, controllable luminous element with shown in two sensitization detecting element orderings and fine object arrow to pass through direction consistent; Between two sensitization detecting elements, light barrier is installed; The light beam irradiates to two that controllable luminous element sends a sensitization detecting element; While carrying out fine object by detection, adopting driving circuit to control controllable luminous element sends by the light beam of characteristic frequency flicker, transfer to the sensitization detecting element of both sides, the output signal of both sides sensitization detecting element obtains two-way after processing by identical amplifying circuit and filtering circuit respectively and receives signal, by having obtained two-way, receive signal subtraction and obtain expressing fine object by the simulating signal of event, this simulating signal and default threshold value are compared and obtain the pulse signal corresponding with the event of passing through.
3. fine object differential detection method according to claim 1 and 2, it is characterized in that: it controls driving circuit controllable luminous element to send the flicker frequency of light beam consistent with the frequency response characteristic of sensitization detecting element, and meet the not undetected requirement during by light path with maximal rate of detected fine object.
4. fine object differential detection method according to claim 1 and 2, is characterized in that: two sensitization detecting elements receiving circuit is separately positioned at same controller, and circuit parameter drift impact is close.
5. fine object differential detection method according to claim 1 and 2, is characterized in that: controllable luminous element adopts light emitting diode.
6. fine object differential detection method according to claim 1 and 2, is characterized in that: sensitization detecting element adopts photoelectric coupling receiving tube.
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| CN201310656786.8A CN103698277A (en) | 2013-12-06 | 2013-12-06 | Differential motion detection method of fine object |
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| CN201310656786.8A CN103698277A (en) | 2013-12-06 | 2013-12-06 | Differential motion detection method of fine object |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4276910A (en) * | 1979-03-15 | 1981-07-07 | Gebruder Loepfe Ag | Photoelectrical bobbin feeler |
| WO1993006464A1 (en) * | 1991-09-27 | 1993-04-01 | Rydborn S A O | Apparatus for monitoring |
| DE19525260A1 (en) * | 1995-07-11 | 1997-01-16 | Iro Ab | Optoelectronic control device and weft measuring memory device |
| EP1018645A1 (en) * | 1998-12-22 | 2000-07-12 | W. SCHLAFHORST AG & CO. | Device for detection of foreign substances in strands of textile material |
| CN2605563Y (en) * | 2003-03-31 | 2004-03-03 | 中国科学院安徽光学精密机械研究所 | Spectral differential absorption photoelectric measuring apparatus capable of eliminating scattering influence |
| WO2007010325A1 (en) * | 2005-07-22 | 2007-01-25 | Premier Evolvics Pvt. Ltd. | Detecting foreign substances in a textile material |
| US20080292360A1 (en) * | 2007-05-21 | 2008-11-27 | Shuji Hirai | Optical sensor and image forming apparatus including same |
| CN102636498A (en) * | 2012-03-22 | 2012-08-15 | 深圳市华星光电技术有限公司 | Detection device and detection method for glass substrate |
-
2013
- 2013-12-06 CN CN201310656786.8A patent/CN103698277A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4276910A (en) * | 1979-03-15 | 1981-07-07 | Gebruder Loepfe Ag | Photoelectrical bobbin feeler |
| WO1993006464A1 (en) * | 1991-09-27 | 1993-04-01 | Rydborn S A O | Apparatus for monitoring |
| DE19525260A1 (en) * | 1995-07-11 | 1997-01-16 | Iro Ab | Optoelectronic control device and weft measuring memory device |
| EP1018645A1 (en) * | 1998-12-22 | 2000-07-12 | W. SCHLAFHORST AG & CO. | Device for detection of foreign substances in strands of textile material |
| CN2605563Y (en) * | 2003-03-31 | 2004-03-03 | 中国科学院安徽光学精密机械研究所 | Spectral differential absorption photoelectric measuring apparatus capable of eliminating scattering influence |
| WO2007010325A1 (en) * | 2005-07-22 | 2007-01-25 | Premier Evolvics Pvt. Ltd. | Detecting foreign substances in a textile material |
| US20080292360A1 (en) * | 2007-05-21 | 2008-11-27 | Shuji Hirai | Optical sensor and image forming apparatus including same |
| CN102636498A (en) * | 2012-03-22 | 2012-08-15 | 深圳市华星光电技术有限公司 | Detection device and detection method for glass substrate |
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Application publication date: 20140402 |