CN105651312B - A kind of device for suppressing bias light interference - Google Patents
A kind of device for suppressing bias light interference Download PDFInfo
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- CN105651312B CN105651312B CN201610107492.3A CN201610107492A CN105651312B CN 105651312 B CN105651312 B CN 105651312B CN 201610107492 A CN201610107492 A CN 201610107492A CN 105651312 B CN105651312 B CN 105651312B
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- photochopper
- light
- background objects
- interference
- receiving lens
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- 230000003287 optical effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000005622 photoelectricity Effects 0.000 claims 1
- 239000003500 flue dust Substances 0.000 description 18
- 238000005259 measurement Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
The invention discloses a kind of device for suppressing bias light interference, the receiving light path formed including light source and by receiving lens, photochopper and optical-electrical converter, the laser beam that light source is sent is irradiated on measured object and background objects, the convergence Jing Guo receiving lens and photochopper block interference light caused by flashlight caused by measured object and background objects successively, the device that is finally photoelectrically converted reception；Photochopper is arranged at the background objects image center that interference light is formed after receiving lens, and the size of photochopper blocked area is consistent with the size of background objects image, and the size of photochopper blocked area is less than the size of measured object image；Optical-electrical converter is located at the measured object image that flashlight is formed after receiving lens.Apparatus of the present invention are provided with photochopper in receiving light path, and bias light interference sections are absorbed using photochopper, farthest inhibit interference of the bias light to flashlight, improve the Signal to noise ratio for receiving light, improve the measuring accuracy of instrument.
Description
Technical field
The present invention relates to a kind of device for suppressing bias light interference, belong to technical field of optical instrument.
Background technology
In the tester based on optical method, its general principle is light irradiation testee, by being dissipated to testee
Light is penetrated to be detected, analyze measurement result is calculated.But nearby always there are some backgrounds in the testee in actual environment
Object, reflection of these background objects to light, scattering can be equally entered in photodetector (optical-electrical converter), so as to disturb pair
The measurement of testee.Testee scattered light signal is often submerged in strong background reflection, the interference of scattering light, be from this
Measurement is completed under the strong jamming pattern of sample becomes extremely difficult, therefore suppresses strong bias light interference, improves the letter for receiving optical signal
Number with interference than SIR (Signal to Interference Ratio), turn into the key technology that must be solved.
The content of the invention
Goal of the invention：The technical problems to be solved by the invention are to provide a kind of device for suppressing bias light interference, pass through
Increase photochopper in receiving light path, so as to inhibit the interference of bias light, improve signal and the interference received in optical signal
Than realizing accurately measuring for instrument.
The content of the invention：To realize above-mentioned technique effect, the technical solution adopted in the present invention is：
A kind of device for suppressing bias light interference, including light source and by receiving lens, photochopper and optical-electrical converter group
Into receiving light path, the laser beam that the light source is sent is irradiated on measured object and background objects, flashlight caused by measured object and
The convergence Jing Guo receiving lens and photochopper block interference light caused by background objects successively, the device that is finally photoelectrically converted reception；
The photochopper is arranged at the background objects image that interference light is formed after receiving lens, and the photochopper blocks
The size in area is consistent with the size of the background objects image, and the size of the photochopper blocked area is less than the measured object image
Size；
The optical-electrical converter is located at the measured object image that flashlight is formed after receiving lens.
A kind of method for being suppressed bias light interference using above-mentioned suppression bias light countermeasure set, is comprised the following steps：
Step 1, corresponding background objects are determined according to different application scenarios；
Step 2, the position of receiving lens and the focal length needed for it are determined according to measured object, calculates optical-electrical converter
Position and the minimum dimension of required sensitive surface；
Step 3, the distance of background objects and receiving lens is measured, background is obtained according to the distance of background objects and receiving lens
The image space and size of thing, the photochopper of required size is arranged on the position of background objects imaging；
Step 4, the position of light source and the direction of laser beam are set.
Wherein, the angle in the direction of the laser beam and receiving light path direction is light source and measured object line and receiving light path
The angle formed.
The principle of apparatus of the present invention is：In different application scenarios, because the distance of measured object and receiving lens is
Know, by the receiving lens of focal length needed for selection, and then the position of optical-electrical converter and the minimum of required sensitive surface is determined
Size；Then according to background objects and the distance of receiving lens, the positions and dimensions of background objects imaging is calculated, are imaged in background objects
Position set photochopper (a such as metallic plate) completely made of light screening material, the size of the photochopper is according to background objects
Size determines.
Photochopper position is calculated by following manner：The inverse of distance between photochopper and receiving lens, plus the back of the body
The inverse of distance between scenery and receiving lens, equal to the inverse of receiving lens focal length.
Beneficial effect：The suppression bias light countermeasure set of the present invention, it is provided with photochopper in receiving light path, using shading
Device absorbs to bias light interference sections, farthest inhibits interference of the bias light to flashlight, improves reception light
Signal to noise ratio, improve the measuring accuracy of instrument.
Brief description of the drawings
Fig. 1 is that the present invention suppresses structural representation of the bias light countermeasure set in embodiment application scenarios；
Fig. 2 is the schematic diagram that the present invention suppresses bias light countermeasure set；
When Fig. 3 is in device without photochopper, using the bias light interference strength of ZEMAX software emulations；
When Fig. 4 is in device without photochopper, using the signal light intensity of ZEMAX software emulations；
Fig. 5 is the intensity after being suppressed using the bias light interference of ZEMAX software emulations when having photochopper in device；
Fig. 6 is when having photochopper in device, using the signal light intensity of ZEMAX software emulations.
Embodiment
Technical scheme is described further with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention suppresses the device of bias light interference, including light source 101 and (connect by receiving lens 107
Receipts lens 107 are convex lens), the receiving light path that forms of photochopper 110 and optical-electrical converter 113, apparatus of the present invention are applied to
The measurement of low concentration flue dust in stationary source flue, in this application scenarios, measured object is flue dust 103, and background objects are cigarette
Road wall 104, light source 101 send laser beam 102 and are irradiated to inside flue, and the scattering light of flue dust 103 is flashlight 106, walling of flue
104 diffuse passes through receiving lens 107, receiving lens 107 for ambient interferences light 105, flashlight 106 and interference light 105
There is convergence effect to flashlight 106 (scattering light) and interference light 105 (diffusing), flashlight 106 (scattering light) convergence is energy
The scattering light I108 for S is measured, interference light 105 (diffusing) convergence is the I109 that diffuses that energy is I；Scatter light I108 and
The I109 that diffuses is come at photochopper 110, and photochopper 110 stops scattering light I108, and remainder is scattering light after stop
II111, its light intensity are So, and photochopper 110 stops the I109 that diffuses, and remainder is the II112 that diffuses after stop, its light
Strong is Io；Optical-electrical converter 113 receives the II112 and scattering light II111 that diffuses, and is converted to electric signal, its signal exported
Compare SIR=So/Io with interference.
As shown in Fig. 2 apparatus of the present invention are applied to the measurement of low concentration flue dust in stationary source flue, measured object flue dust
103, background objects walling of flue 104, a height of A of thing of flue dust 103 and walling of flue 104 in receiving light path；Tested flue dust 103 is receiving thoroughly
The right side of mirror 107 is imaged as flue dust as 202, and its image height is B, and the part is the scattered signal light of measured object；Walling of flue 104 is connecing
The right side for receiving lens 107 is imaged as walling of flue as 201, and its image height is C, and the part is ambient interferences light；Optical-electrical converter 113 is put
Put and (the ambient interferences light of background objects image 201 is eliminated in its optical signal received at measured object image (flue dust picture) 202
Composition), its photosensitive area size is B；Photochopper 110 is placed at background objects image (walling of flue picture) 201, and its blocked area size is
C, it absorbs the energy of background objects image 201, so as to play a part of suppressing bias light interference；
Wherein, the high A=20mm of thing；The photosensitive area area of optical-electrical converter 113 is B*B=4*4mm2, photochopper 110 it is straight
Footpath C=1.4mm, flue dust are 4mm as 202 image height B, and walling of flue is 1.4mm as 201 image height C；Receiving lens 107 it is a diameter of
30mm, focal length f=100mm, receiving lens 107 and the distance V of photochopper 1101(photochopper 110 is located at distance and received=103mm
The focal point 3mm of lens 107 position), receiving lens 107 and the distance V of optical-electrical converter 113S=120mm, receiving lens 107
With the distance U of walling of flue 104I=3500mm, receiving lens 107 and the distance U of flue dust 103S=600mm.
As illustrated in figures 3-6, flue dust 103, it is assumed that caused scattering light is modeled as respectively in scattering under the irradiation of light beam 102
To uniformly light-emitting body, its luminous intensity is normalized to 1；Walling of flue 104, it is assumed that the caused diffusing reflection under the irradiation of light beam 102
It is modeled as each being normalized to 1 to uniformly light-emitting body, its luminous intensity；Modeled using ZEMAX optical softwares, and carry out reception light intensity
Simulation analysis, it is as a result as follows：
Assuming that the present invention suppresses to be not provided with photochopper 110 in bias light countermeasure set, also without flue dust 103 is tested, only
Have walling of flue 104 produce diffusing reflection under the conditions of, optical-electrical converter 113 export walling of flue as 201 interference strength I=
0.91373, shown in simulation result Fig. 3；
Assuming that the present invention suppresses to be not provided with photochopper 110 in bias light countermeasure set, also produced without walling of flue 104 unrestrained
Reflection, only tested flue dust 103 are produced under scattered signal optical condition, and the flue dust that optical-electrical converter 113 exports is as 202 signal intensities
S=0.58429, shown in simulation result Fig. 4；
Therefore the present invention suppresses in bias light countermeasure set under conditions of photochopper 110 is not provided with, its opto-electronic conversion
The Signal to noise ratio SIR that device 113 exports is S/I=0.63945.
The present invention suppresses photochopper 110 be present in bias light countermeasure set, is not tested flue dust 103, only walling of flue 104
Produce diffusing reflection under the conditions of, optical-electrical converter 113 export walling of flue as 201 interference strength Io=9.6725 × 10-7, emulation
Shown in result figure 5；
The present invention suppresses photochopper 110 in bias light countermeasure set be present, but produces diffusing reflection without walling of flue 104, only
Have under scattered signal optical condition caused by tested flue dust 103, the flue dust that optical-electrical converter 113 exports is as 202 signal intensity So=
0.53542, shown in simulation result Fig. 6；
Therefore the present invention suppresses under conditions of setting photochopper 110 in bias light countermeasure set, and optical-electrical converter 113 exports
SIR be So/Io=5.535 × 105。
As seen from the above comparison, photochopper 110 is provided with device and is not provided with photochopper 110, optical-electrical converter
The SIR of 113 outputs improves (So/Io)/(S/I)=8.656 × 106Times, the signal intensity that optical-electrical converter 113 receives subtracts
Small (S-So)/S=8.36%..
The present invention suppress bias light countermeasure set, by walling of flue as 201 at set photochopper 110, make bias light pair
The interference of flashlight is suppressed significantly, and the Signal to noise ratio SIR of its optical-electrical converter 113 output improves 8.656 × 106
Times；Photochopper 110 can cause measured object to be blocked as 202 part optical signals simultaneously, and signal reduces 8.36%.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this hair
Bright protection domain does not limit to and such especially statement and embodiment.One of ordinary skill in the art can be according to this hair
These bright disclosed technical inspirations make various other various specific deformations and combination for not departing from essence of the invention, these deformations
It is still within the scope of the present invention with combining.
Claims (3)
- A kind of 1. device for suppressing bias light interference, it is characterised in that：Including light source and by receiving lens, photochopper and photoelectricity The receiving light path of converter composition, the laser beam that the light source is sent is irradiated on measured object and background objects, caused by measured object The convergence Jing Guo receiving lens and photochopper block interference light caused by flashlight and background objects successively, are finally photoelectrically converted Device receives；The photochopper is arranged at the background objects image that interference light is formed after receiving lens, the photochopper blocked area Size is consistent with the size of the background objects image, and the size of the photochopper blocked area is less than the chi of the measured object image It is very little；The optical-electrical converter is located at the measured object image that flashlight is formed after receiving lens.
- 2. a kind of method for being suppressed bias light interference using the device for suppressing bias light interference described in claim 1, its feature are existed In：Comprise the following steps：Step 1, corresponding background objects are determined according to different application scenarios；Step 2, the position of receiving lens and the focal length needed for it are determined according to measured object, calculates the position of optical-electrical converter With the minimum dimension of required sensitive surface；Step 3, the distance of background objects and receiving lens is measured, background objects are obtained according to the distance of background objects and receiving lens Image space and size, the photochopper of required size is arranged on the position of background objects imaging；Step 4, the position of light source and the direction of laser beam are set.
- 3. the device according to claim 1 for suppressing bias light interference, it is characterised in that：The direction of the laser beam is with connecing Receive the angle that the angle of optical path direction is formed by light source and measured object line with receiving light path.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610107492.3A CN105651312B (en) | 2016-02-26 | 2016-02-26 | A kind of device for suppressing bias light interference |
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| CN201610107492.3A CN105651312B (en) | 2016-02-26 | 2016-02-26 | A kind of device for suppressing bias light interference |
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| CN105651312B true CN105651312B (en) | 2018-04-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106525816A (en) | 2016-12-08 | 2017-03-22 | 同方威视技术股份有限公司 | Non-contact type security check system and method |
| US11112494B2 (en) * | 2017-05-18 | 2021-09-07 | Sharp Kabushiki Kaisha | Photodetector and portable electronic equipment |
| CN107727597B (en) * | 2017-12-04 | 2020-02-21 | 南京安荣信电子科技有限公司 | Ultraviolet differential concentration inversion and interference suppression method for mixed gas |
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| EP2530442A1 (en) * | 2011-05-30 | 2012-12-05 | Axis AB | Methods and apparatus for thermographic measurements. |
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