CN102072810B - Integral measuring method for signal-to-noise ratio of optical filter - Google Patents
Integral measuring method for signal-to-noise ratio of optical filter Download PDFInfo
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- CN102072810B CN102072810B CN 200910220050 CN200910220050A CN102072810B CN 102072810 B CN102072810 B CN 102072810B CN 200910220050 CN200910220050 CN 200910220050 CN 200910220050 A CN200910220050 A CN 200910220050A CN 102072810 B CN102072810 B CN 102072810B
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Abstract
The invention belongs to the field of optical testing, and in particular relates to an integral measuring method for a signal-to-noise ratio of an optical filter, which comprises the following steps of: a, irradiating an optical filter (2) to be measured by utilizing an optical source (1); b, receiving a transmission signal and a noise signal of the optical filter (2) to be measured in the step a by using a photoelectric detector (4); c, after the transmission signal and the noise signal in the step b are converted through a modulus, sending the converted transmission signal and noise signal to a central processing part, calculating and processing; and d, displaying a processing result in the form of a signal-to-noise ratio optical density (OD) value, wherein the signal-to-noise ratio OD value OD in the step d is -lg((St-Sn)/Sn). In the method, a cut-off filter is arranged between the optical filter (2) to be measured and the photoelectric detector (4) to obtain the noise signal; and the transmission and cut-off characteristics of the cut-off filter (3) are opposite to the spectral characteristic of the optical filter (2) to be measured. The integral measuring method is easy to operate, high in detection accuracy, reliable in data and easy for hardware matching.
Description
Technical field
The invention belongs to the optic test field, more particularly, relate to a kind of optical filter signal to noise ratio (S/N ratio) integral measurement method.
Background technology
Biochemical optical filter is to be applied to key element biomedical and the life science instrument, and mainly acting on is isolation and selection material property band spectrum in biomedical check analysis system.To guarantee in the use that the optical filter passband sees through signal and can not flooded by the background area noise signal, therefore will measure the optical filter signal to noise ratio (S/N ratio).At present, for the measurement of optical filter signal to noise ratio (S/N ratio), it is big still to exist the test data error, and measurement result is long computing time, is not easy to problems such as hardware is supporting.
Summary of the invention
The present invention be intended to overcome the weak point of prior art and provide a kind of simple to operate, accuracy of detection is high, data are reliable and be easy to the supporting optical filter signal to noise ratio (S/N ratio) integral measurement method of hardware.
For achieving the above object, the present invention is achieved in that
Optical filter signal to noise ratio (S/N ratio) integral measurement method, can implement as follows:
A, utilize light source irradiation optical filter to be measured;
B, see through signal and noise signal through the said optical filter to be measured of photodetector receiving step a;
C, step b be said to be seen through signal and noise signal and after analog to digital conversion, sends into central processing portion and calculate, handle;
D, result show with the form of signal to noise ratio (S/N ratio) OD value.
As a kind of preferred version, signal to noise ratio (S/N ratio) OD value is in the steps d according to the invention: OD=-1g ((S
t-S
n)/S
n).
As another kind of preferred version, the present invention obtains noise signal through between optical filter to be measured and photodetector, adding the cut-off type filter.
As preferred version, the spectral characteristic of the transmission of cut-off type filter according to the invention and cut-off characteristics and optical filter to be measured is opposite.
Further, the present invention can adopt the whole logical optical range of the said optical filter to be measured of light source irradiation.
Further, the signal that sees through according to the invention is the see through signal of said optical filter to be measured in whole investigative range.
In addition, noise signal according to the invention is the signal that sees through of optical filter cut-off region.
Secondly, light source according to the invention can adopt the halogen tungsten lamp light source.
The present invention is simple to operate, accuracy of detection is high, data are reliable and it is supporting to be easy to hardware.Compared with prior art, the present invention has following characteristics:
1, measurement range is the scope of accepting of photodetector, rather than certain fixed wave length;
2, the test bore is the clear aperture of optical filter, and incident light source can pass through optical filter fully, and test data more accurately and reliably;
3, test gained data are the background value of signal to noise ratio (S/N ratio) conversion, can express by background signal intuitively and see through the magnitude relationship of signal, through the integral and calculating in investigative range, demonstrate the performance of tested optical filter more intuitively;
4, light path system and data acquisition system (DAS) are simple in structure, are prone to realize that hardware is supporting.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.Protection scope of the present invention will not only be confined to the statement of following content.
Fig. 1 is the present invention's optical filter background to be measured detection system structural drawing;
Fig. 2 is a cut-off type filter structural representation of the present invention;
Fig. 3 is the circuit theory diagrams of A/D converter of the present invention;
Fig. 4 sees through curve for bandpass filter of the present invention in whole investigative range;
Fig. 5 is the curve synoptic diagram that sees through of bandpass filter of the present invention and cut-off type filter;
Fig. 6 is the background curves synoptic diagram of bandpass filter of the present invention and cut-off type filter.
Embodiment
According to the spectral response characteristics of illuminating source, optical filter, photodetector, in detector is accepted scope, measure optical filter respectively and see through signal and noise signal, calculate through the follow-up data acquisition module, obtain the signal to noise ratio (S/N ratio) of measured optical filter.
As shown in the figure, optical filter signal to noise ratio (S/N ratio) integral measurement method, can implement as follows:
A, utilize halogen tungsten lamp light source 1 irradiation optical filter 2 to be measured;
B, see through signal and noise signal through the said optical filter 2 to be measured of photodetector 4 receiving step a;
C, step b be said to be seen through signal and noise signal and after analog to digital conversion, sends into central processing portion and calculate, handle;
D, result show with the form of signal to noise ratio (S/N ratio) OD value.
Signal to noise ratio (S/N ratio) OD value is in the steps d according to the invention: OD=-1g ((S
t-S
n)/S
n).
The present invention is through obtaining noise signal at optical filter 2 to be measured and 4 addings of photodetector cut-off type filter 3.
The spectral characteristic of the transmission of cut-off type filter 3 according to the invention and cut-off characteristics and optical filter to be measured 2 is opposite.
The present invention adopts the whole logical optical range of the said optical filter 2 to be measured of light source 1 irradiation.
The signal that sees through according to the invention is the see through signal of said optical filter to be measured in whole investigative range.
Noise signal according to the invention is the signal that sees through of optical filter cut-off region.
As shown in Figure 1; The measurement that optical filter of the present invention sees through signal and noise signal is to utilize halogen tungsten lamp light source 1 as the light source irradiation optical filter, controls respectively through computer processing not add and add suitable cut-off type filter 3, receives signal by photodetector 4 again; Through A/D conversion and computer programs process; Finally the form with the OD value demonstrates, and according to the spectral characteristic of optical filter 2 to be measured, can regulate light source intensity and the type of selecting the cut-off type filter through computer processing simultaneously; The adding of cut-off type filter is through computer program control motor, rotates to required filter position thereby drive the wheel disc that is equipped with dissimilar filters.Fig. 2 is the synoptic diagram of cut-off type filter group wheel disc of the present invention, is the hypersorption filter F-1 number among the figure, is used for baseline calibration, and F-2 number be blank position, is respectively the different filters that end wave band F-3～F-8 number.Fig. 4 is that bandpass filter sees through curve in whole investigative range.Fig. 5 is the curve that sees through of bandpass filter (solid line) and cut-off type filter (dotted line), and the optical filter pass band areas is positioned at the cut-off region of filter.Fig. 6 is the background curves of bandpass filter (solid line) and cut-off type filter (dotted line).Fig. 3 is the circuit theory diagrams of A/D converter of the present invention.
Be with being appreciated that; More than about specific descriptions of the present invention; Only be used to the present invention is described and be not to be subject to the described technical scheme of the embodiment of the invention; Those of ordinary skill in the art should be appreciated that still and can make amendment or be equal to replacement the present invention, to reach identical technique effect; As long as satisfy the use needs, all within protection scope of the present invention.
Claims (1)
1. optical filter signal to noise ratio (S/N ratio) integral measurement method is characterized in that, implements as follows:
A, utilize light source (1) to shine optical filter to be measured (2); Adopt the whole logical optical range of light source (1) the said optical filter to be measured of irradiation (2); Said light source (1) is the halogen tungsten lamp light source;
B, see through signal and noise signal through photodetector (4) the said optical filter to be measured of receiving step a (2); Noise signal obtains through the cut-off type filter (3) that between optical filter to be measured (2) and photodetector (4), adds; The spectral characteristic of the transmission of said cut-off type filter (3) and cut-off characteristics and optical filter to be measured (2) is opposite; The said signal that sees through is the see through signal of said optical filter to be measured in whole investigative range; Said noise signal is the signal that sees through of optical filter cut-off region;
C, step b be said to be seen through signal and noise signal and after analog to digital conversion, sends into central processing portion and calculate, handle;
D, result show with the form of signal to noise ratio (S/N ratio) OD value.
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| CN 200910220050 CN102072810B (en) | 2009-11-20 | 2009-11-20 | Integral measuring method for signal-to-noise ratio of optical filter |
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| CN 200910220050 CN102072810B (en) | 2009-11-20 | 2009-11-20 | Integral measuring method for signal-to-noise ratio of optical filter |
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| CN102072810B true CN102072810B (en) | 2012-12-19 |
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| CN105319542A (en) * | 2015-05-13 | 2016-02-10 | 贾洪涛 | Magnetic type laser radar echo spectrum separator |
| CN107063647A (en) * | 2017-05-05 | 2017-08-18 | 四川九州光电子技术有限公司 | The isolation of filter plate and the detection means and method of input light loss objective |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192808A (en) * | 1995-06-07 | 1998-09-09 | 马西默有限公司 | Optical filter for spectroscopic measurement and method of producing |
| CN101140224A (en) * | 2006-09-08 | 2008-03-12 | 深圳迈瑞生物医疗电子股份有限公司 | Enzyme mark instrument spectrophotometric detecting optical system, and light diaphragm and optical filter wheel thereof |
-
2009
- 2009-11-20 CN CN 200910220050 patent/CN102072810B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192808A (en) * | 1995-06-07 | 1998-09-09 | 马西默有限公司 | Optical filter for spectroscopic measurement and method of producing |
| CN101140224A (en) * | 2006-09-08 | 2008-03-12 | 深圳迈瑞生物医疗电子股份有限公司 | Enzyme mark instrument spectrophotometric detecting optical system, and light diaphragm and optical filter wheel thereof |
Non-Patent Citations (1)
| Title |
|---|
| 钱惠国.再议滤光片光谱透过率的测量.《大学物理实验》.2007,第20卷(第4期),22,25-27. * |
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Owner name: SHENYANG ACADEMY OF INSTRUMENTATION SCIENCE CO., L Free format text: FORMER NAME: SHENYANG INSTRUMENT SCIENTIFIC ACADEMY |
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Address after: 110043 Beihai street, Shenyang, Liaoning, No. 242 Patentee after: Shenyang Academy of Instrumentation Science Co., Ltd. Patentee after: Huibo Optic Technology Co., Ltd., Shenyang Address before: 110043 Beihai street, Shenyang, Liaoning, No. 242 Patentee before: Shenyang Instrument Scientific Academy Patentee before: Huibo Optic Technology Co., Ltd., Shenyang |
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Effective date of registration: 20181213 Address after: 110043 Beihai street, Dadong District, Shenyang, Liaoning Province, No. 242 Patentee after: Shenyang Academy of Instrumentation Science Co., Ltd. Address before: 110043 Beihai street, Dadong District, Shenyang, Liaoning Province, No. 242 Co-patentee before: Huibo Optic Technology Co., Ltd., Shenyang Patentee before: Shenyang Academy of Instrumentation Science Co., Ltd. |