Phase object phase distribution quantitative measurement method and device as well as application of method and device
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A quantitative measurement and phase technology, applied in measurement devices, using optical devices, analyzing materials, etc., can solve the problems of complex optical path adjustment, inability to use real-time imaging or observation, and many optical components.
Inactive Publication Date: 2013-01-16
SOUTH CHINA NORMAL UNIVERSITY
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[0002] There are many methods for observing and displaying pure phase objects, mainly including phase contrast method, dark field method, schlieren method, knife-edge method, etc. These methods are widely used in the fields of optical information processing, biomedicine, material testing and scientific research. , but these methods are mostly used for qualitative observation, and it is difficult to realize the quantitative phase distribution measurement of pure phase objects
At present, the quantitative measurement methods of phase objects mainly include dual p
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Embodiment 1
[0065] Such as figure 1 As shown, a device for realizing the quantitative measurement method of the phase distribution of a phase object includes a light source 1, a beam expander lens 2, a pinhole filter 3, a collimator lens 4, a transparent medium 5 carrying a phase object, a convex lens 6, and a high-pass filter Device 7, shielding cover 8, area array photodetector 9 and computer 10. Among them, along the beam direction, the light source 1, the beam expander lens 2, the pinhole filter 3, the collimator lens 4, the transparent medium 5 carrying the phase object, the convex lens 6, the high-pass filter 7 and the area array photodetector 9 are arranged in sequence , the computer 10 is connected to the area array photodetector 9, and the shielding cover 8 is arranged outside the convex lens 6, the high-pass filter 7 and the area array photodetector 9.
[0066] The light source 1 can be a variety of low-power visible light lasers, such as helium-neon lasers, semiconductor laser...
Embodiment 2
[0069] Such as figure 2 As shown, a device for realizing the quantitative measurement method of the phase distribution of a phase object includes a light source 1, a beam expander lens 2, a pinhole filter 3, a collimator lens 4, a transparent medium 5 carrying a phase object, a convex lens 6, and a high-pass filter Device 7, shielding cover 8, area array photodetector 9, computer 10, mirror 11 and convex lens 12. Wherein, along the beam direction, light source 1, reflector 11, beam expander lens 2, pinhole filter 3, collimator lens 4, transparent medium 5 carrying phase object, convex lens 6, high-pass filter 7, convex lens 12 and surface Array photodetectors 9 are arranged in sequence; computer 10 is connected to area array photodetectors 9; beam expander lens 2, pinhole filter 3, collimator lens 4, transparent medium 5 carrying phase objects, convex lens 6, high-pass filter 7 , the area array photodetector 9 and the convex lens 12 are all arranged in the shielding case. T...
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Abstract
The invention discloses a phase object phase distribution quantitative measurement method and a phase object phase distribution quantitative measurement device as well as application of the method and the device. According to the method, the parallel light is projected on a phase object, and a bright field image of the phase object is obtained through an imaging lens; in the direction of light beams, a filter is placed on the frequency spectrum surface behind the imaging lens for absorbing the zero-level frequency spectrum of the object, and a dark field image of the phase object is obtained; and according to information carried by the two images and the theoretical expression of the image light intensity, the bright field image and the dark field image are analyzed by the image processing technology, the phase value of each point of the phase object is obtained, and the phase distribution or image of the phase object is reconstructed. The device for realizing the method is characterized in that a light source, a beam expanding lens, a pinhole filter, a collimating lens, a device for placing the phase object, an imaging lens, the filter used for absorbing the zero-level frequency spectrum of the phase object and an area array photoelectric detector are sequentially arranged in the advancing direction of light beams. The method, the device and the application have the advantages that the quantitative measurement of the phase object is realized, the phase measuring range is 0 to pi, the device is simple, and the cost is low.
Description
technical field [0001] The invention belongs to the technical field of optical precision measurement and image display, and in particular relates to a quantitative measurement method and device for phase distribution of a phase object and an application thereof. Background technique [0002] There are many methods for observing and displaying pure phase objects, mainly including phase contrast method, dark field method, schlieren method, knife-edge method, etc. These methods are widely used in the fields of optical information processing, biomedicine, material testing and scientific research. , but these methods are mostly used for qualitative observation, and it is difficult to realize the quantitative phase distribution measurement of pure phase objects. At present, the quantitative measurement methods of phase objects mainly include dual point source interference scanning imaging method, differential interference phase contrast method, phase shift interferometry, etc. The...
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