A lens diopter measurement device and method based on optical fiber interference projection
A fiber optic interference and measurement device technology, applied in the field of optical measurement, can solve problems such as complex data processing procedures and large errors, and achieve the effects of simplifying instrumentation and calculation processes, high sensitivity, and improving accuracy
Active Publication Date: 2019-11-15
NANJING UNIV OF SCI & TECH
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Problems solved by technology
The data processing program of the Moiré fringe method is complicated, and a large error will be introduced in the calculation process
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Embodiment 1
[0057] combine figure 1 , the implementation device of the present invention includes a laser 1, a 1×3 fiber coupler 2, a polarization controller 3, an optical switch 4, a first optical fiber 5, a second optical fiber 6, a third optical fiber 7, a collimator lens 8, and Lens 9, imaging screen 10, CCD11, computer 12.
[0058] The polarization controller 3 described in this embodiment can control the polarization states of the first optical fiber 5 and the third optical fiber 7 to be consistent with the second optical fiber 6 and interfere with it.
[0059] combine figure 2 , the first optical fiber 5, the second optical fiber 6, and the third optical fiber 7 described in this embodiment are arranged in an "L" shape, and the first optical fiber 5 and the second optical fiber 6 are two beams of coherent light in the direction of the longitudinal axis; The second optical fiber 6 and the third optical fiber 7 are two beams of coherent light in the direction of the horizontal axi...
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The invention discloses a lens diopter measurement device and method based on fiber interference projection. The measurement device comprises a laser, a 1*3 fiber coupler, a polarization controller, an optical switch, first to third fibers, a collimating lens, a to-be-measured lens, an imaging screen, a CCD and a computer. The method comprises that a chequer scaling board is used to calibrate theCCD, a geometric conversion relation between a reference plane of the imaging screen and a target surface of the CCD is established; light emitted by the laser is input to the fiber coupler, the polarization controller is adjusted, polarization of light emitted by the first and third fibers interferes with light emitted by the second fiber to obtain an interference fringe graph; the to-be-measuredlens is placed, interference fringe is projected to the imaging screen via the to-be-measured lens, the CCD receives the interference fringe graph in which phase deflection occurs in the imaging screen, and the diopter of the to-be-measured lens in the transverse and longitudinal axes is calculated; and phase information is resolved via Fourier transform, and the diopter of the lens is obtained.The measurement device and method have advantages of high efficiency, high precision and wide application.
Description
technical field [0001] The invention relates to the technical field of optical measurement, in particular to a lens diopter measurement device and method based on optical fiber interference projection. Background technique [0002] With the development of science and technology and the advent of the information age, people's demands for visual quality are getting higher and higher. As optical lenses are the main way to correct human vision, the design of spectacle lenses is also constantly updated, various types of products emerge in an endless stream, and the distribution of lens diopters is becoming more and more complex. Diopter is one of the most important optical parameters of ophthalmic optical lenses, and it is also the unit of refractive power of spectacle lenses that is commonly used around the world. Because this parameter directly affects the visual effect after vision correction, the measurement of the diopter value of the lens plays a pivotal role in ophthalmol...
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IPC IPC(8): G01M11/02
CPCG01M11/0271
Inventor 何勇蒋正东朱荣刚李浩宇陈磊吴敬仁
Owner NANJING UNIV OF SCI & TECH