CN1955701B - Hartmann-shack wavefront sensor based on Fourier spectrum filtering module - Google Patents
Hartmann-shack wavefront sensor based on Fourier spectrum filtering module Download PDFInfo
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Abstract
A shack-Hartmann wavefront sensor based on a Fourier spectrum filtering module comprises a reference light source, a reflector, a beam shrinking system, a lens array, a matching lens group and a photoelectric detector. The method is characterized in that: the Fourier spectrum filtering module is connected behind the photoelectric detector and used for suppressing image noise in low signal-to-noise ratio, and the Fourier spectrum filtering module is used for carrying out Fourier transformation on an image acquired by the photoelectric detector and then carrying out filtering processing and signal restoration. The invention can process the detection image through the special Fourier spectrum filtering module and then realize the detection of the extremely weak target with the signal-to-noise ratio lower than 1.0, when the signal-to-noise ratio is 1.0, the wave surface restoration precision reaches 1/10 wavelengths, and the invention has the characteristics of simple structure, stable working performance and mature processing technology, simplifies the production, installation and adjustment of the sensor and is beneficial to realizing the batch production.
Description
Technical field
The present invention relates to a kind of Shack-Hartmann wave front sensor, particularly a kind of Shack-Hartmann wave front sensor based on the Fourier spectral filtration module.
Background technology
Shack-Hartmann wave front sensor is widely used in the ADAPTIVE OPTICS SYSTEMS.Cut apart before utilizing array lens to probing wave, the wavefront of cutting apart is focused on the CCD photodetector, calculates the slope in each sub-aperture, the PHASE DISTRIBUTION before recovery calculates probing wave.Shack-Hartmann wave front sensor in the self-adaptation adaptive optics system that is applied to various uses, also be used for the measurement of various static phase, such as human eye aberration measurement in optical detection, system calibrating and the medical science etc.Shack-the Hartmann wave front sensor of this quasi-tradition can be referring to " application of Hartmann wave front sensor ", Jiang Wenhan, and aquatic foods are great etc., and quantum electronics is reported Vol.15, April, 1998,2, P228-235; " the Wave-front phase detecting error of Shack-Hartmann wave front sensor ", Shen Feng, Jiang Wenhan, the optics journal, Vol.20, No.5, May 2000, P666-671; " Combined shearing interferometer and Hartmann wavefrontsensor ", US patent No.518854, Hutchin etc., June 17,1982.Existing be used for the employing that has in the Shack-Hartmann wave front sensor of astronomical sight the image intensifier link to carry out the detection of more weak target, referring to " ICCD type in the performance evaluation of CCD type low light level Shack-Hartmann wavefront sensor in contrast ", Cao Genrui etc., the optics journal, Vol.19, No.7, July1999, P975-980.
Above-mentioned various Shack-Hartmann wave front sensor exists deficiency to be when being used for extremely weak target detection: when signal to noise ratio (S/N ratio) is very low, signal is flooded by noise, image that photodetector obtains is not treated then can not to obtain accurate slope data, in the Shack-Hartmann wave front sensor that has adopted image intensifier, when signal is enhanced, but noise also is exaggerated simultaneously, therefore can not effectively improve signal to noise ratio (S/N ratio).
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of Shack-Hartmann wave front sensor based on the Fourier spectral filtration module is proposed, this sensor can be effectively to the detection of extremely weak target, improved signal to noise ratio (S/N ratio), and simple in structure, stable work in work is fit to produce in batches.
Technical solution of the present invention is: based on the Shack-Hartmann wave front sensor of Fourier spectral filtration module, comprise reference light source, catoptron, the beam system that contracts, lens arra, matched lenses group, photodetector, it is characterized in that: the Fourier spectral filtration module that the picture noise when being connected to low signal-to-noise ratio behind described photodetector suppresses, the Fourier spectral filtration module carries out Fourier transformation to the image that photodetector obtains, and carries out Filtering Processing and signal restoring then.
Described Fourier spectral module is various digital hardware modules of solidifying the fast Flourier filtering algorithm, and its course of work comprises at first the signal collected Fourier transform that carries out, and filters out noise spectrum and release signal then to back level disposal system.
The present invention has following advantage with respect to prior art: the present invention handles back effective detection that signal to noise ratio (S/N ratio) has been lower than 1.0 extremely weak realization of goal by its distinctive Fourier spectral filtration module to detection image, has remedied the deficiency that existing Shack-Hartmann wave front sensor only is applicable to strong target detection.The present invention is 1.0 o'clock in signal to noise ratio (S/N ratio), and the corrugated recovery accuracy reaches 1/10 wavelength.In addition, the present invention also possesses simple in structure, stable work in work, and the feature of processing technology maturation is oversimplified production, installation and the adjusting of sensor, is beneficial to and realizes producing in batches, can be used for the various high-precision Wavefront detecting occasion at low signal-to-noise ratio.
Description of drawings
Fig. 1 is a light channel structure synoptic diagram of the present invention.
Embodiment
As shown in Figure 1, the present invention is made up of reference light source 1-5, catoptron 6, the beam system 7 that contracts, lens arra 8, matched lenses group 9, CCD photodetector 10 and Fourier spectral filtering FSF module 11, when demarcating Shack-Hartmann wave front sensor, the parallel beam that reference light source 1-5 produces enters detection system through catoptron 6, calibrated sensor is when work, catoptron 6 switches and light path, and detection of a target light enters detection system and surveys.In light path layout, require reference light source light and detection of a target light after catoptron 6, to be total to light path.The beam system 7 that contracts makes backing system (reference light source, target) beam size of Chan Shenging and array lens coupling, before the wavelet that 9 of matched lenses groups afterwards will be cut apart by array lens on imaging and the ccd detector spare 10, the electric signal of being gathered by ccd detector spare 10 at first enters FSF processing module 11 and handles, and enters back level disposal system then.Fourier spectral filtration module 11 is any hardware module that can realize the filtering of high speed Fourier spectral, and array lens can adopt the micro-optic technology, or adopts binary optical technique to process and get, and the photodetector behind the bundle lens that contract is a group or more.
Picture noise when Fourier spectral filtering FSF module 11 realizes low signal-to-noise ratio by following process suppresses, and promptly at first to the signal collected Fourier transform that carries out, filters out noise spectrum and release signal then to back level disposal system.Specific as follows:
(1) image that is obtained by photoelectric detector is carried out Fourier transformation
G
F＝F(s+n)＝S
F+N
F (1)
S wherein, n, S
F, N
FThe signal and the noise of difference representation space territory and frequency field.
(2) Filtering Processing
Wherein u (x) is the screening function:
D is the supporting domain of wave filter, and T is a threshold value.
(3) signal restoring
Because the supporting domain of signal function is limited, the Fourier spectral filtration module has been realized the Noise Suppression of frequency greater than the composition of its supporting domain.
Claims (4)
1. based on the Shack-Hartmann wave front sensor of Fourier spectral filtration module, comprise reference light source, catoptron, the beam system that contracts, lens arra, matched lenses group, photodetector, it is characterized in that: the Fourier spectral filtration module that the picture noise when being connected to low signal-to-noise ratio behind described photodetector suppresses, the Fourier spectral filtration module carries out Fourier transformation to the image that photodetector obtains, and carries out Filtering Processing and signal restoring then; Picture noise when described Fourier spectral filtration module is realized low signal-to-noise ratio by following process suppresses, and promptly at first to the signal collected Fourier transformation that carries out, filters out noise spectrum and release signal then to back level disposal system, and is specific as follows:
(1) image that is obtained by photoelectric detector is carried out Fourier transformation
G
F＝F(s+n)＝S
F+N
F
S wherein, n, S
F, N
FThe signal and the noise of difference representation space territory and frequency field;
(2) Filtering Processing
Wherein u (x) is the screening function:
D is the supporting domain of wave filter, and T is a threshold value;
(3) signal restoring
Because the supporting domain of signal function is limited, the Fourier spectral filtration module has been realized the Noise Suppression of frequency greater than the composition of its supporting domain.
2. Shack-the Hartmann wave front sensor based on the Fourier spectral filtration module according to claim 1 is characterized in that: described photodetector is the CCD photodetector.
3. Shack-the Hartmann wave front sensor based on the Fourier spectral filtration module according to claim 1 is characterized in that: described lens arra adopts the micro-optic technology, or the employing binary optical technique is processed and got.
4. Shack-the Hartmann wave front sensor based on the Fourier spectral filtration module according to claim 1 is characterized in that: the photodetector behind the described beam system that contracts is more than one group.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115628A (en) * | 1993-07-22 | 1996-01-31 | 株式会社岛津制作所 | Magnetic resonance imaging apparatus |
| CN1465966A (en) * | 2002-06-24 | 2004-01-07 | 中国科学院光电技术研究所 | Hartmann wavefront sensor for pulse light wavefront measurement |
| CN1465968A (en) * | 2002-06-24 | 2004-01-07 | 中国科学院光电技术研究所 | Hartmann wavefront sensor with adjustable dynamic range and measurement accuracy |
| CN1601231A (en) * | 2003-09-28 | 2005-03-30 | 中国科学院光电技术研究所 | Human eye aberration Hartmann wavefront sensor based on microprism array |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115628A (en) * | 1993-07-22 | 1996-01-31 | 株式会社岛津制作所 | Magnetic resonance imaging apparatus |
| CN1465966A (en) * | 2002-06-24 | 2004-01-07 | 中国科学院光电技术研究所 | Hartmann wavefront sensor for pulse light wavefront measurement |
| CN1465968A (en) * | 2002-06-24 | 2004-01-07 | 中国科学院光电技术研究所 | Hartmann wavefront sensor with adjustable dynamic range and measurement accuracy |
| CN1601231A (en) * | 2003-09-28 | 2005-03-30 | 中国科学院光电技术研究所 | Human eye aberration Hartmann wavefront sensor based on microprism array |
Non-Patent Citations (6)
| Title |
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| CN 1465966 A,全文. |
| CN 1465968 A,全文. |
| 段海峰等.快速傅里叶算法在哈特曼-夏克传感器波前重构算法中的应用.光学学报23 2.2003,23(2),240-244. |
| 段海峰等.快速傅里叶算法在哈特曼-夏克传感器波前重构算法中的应用.光学学报23 2.2003,23(2),240-244. * |
| 饶长辉等.基于哈特曼-夏克波前探测的图像解卷积：室内结果.光学学报22 7.2002,22(7),789-793. |
| 饶长辉等.基于哈特曼-夏克波前探测的图像解卷积:室内结果.光学学报22 7.2002,22(7),789-793. * |
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