Day and Night Laser Ranging Telescope System Design

• Main Authors: LEE SIAK LIM, 李錫霖
• Other Authors: Der-Chin Chen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/7js66s

碩士 === 逢甲大學 === 電機工程學系 === 103 === This thesis is mainly study the laser range finder (LRF) system design for the day and night observation. The night vision and telescope are using the co-axis, therefore not only system size is diminished, but also the system weight is lighted and easy to maintain. The day and night laser range finder telephoto devices can be captured the target for threat image, detection the signal by object return signal, and immediate measure the range. The laser range finder operation principle, firstly emitted the laser beam to the target and received the laser beam from the target reflection, after that signal processing by microprocessor completed for the distance measurement. Consider for the eye safety, we using the wavelength 1550nm for a laser module, it does not cause the eyes harmful, and the eyepiece for the transmittance of laser light wavelength 1550nm is less than 1%. Measure distance from 5-9000m, because of the far distance will attenuation the signal cause the avalanche photodiode (APD) undetectable, so it must be adopted a high power semiconductor laser is about 14W. The magnification of binocular refractive telescope is 7X, objective lens aperture is 42mm, eyepiece aperture is 6mm, viewing angle of the telescope and image intensifier is 6.75∘and 7∘respectively, the diopter range from +4D ~ - 4D and the MTF value at the axis is ≧0.3@0.3cyc/mrad; out of the axis is ≧0.2@0.3cyc/mrad. The gain of image intensifier is 40000, signal noise ratio is 24, the resolution is 64mm/lp and the optical distortion is <5%.