Automatic laser detection and protection device based on LCD light switch

CHEN Jia-qi; LI Zhen; ZHANG Ya-ping

doi:10.7510/jgjs.issn.1001-3806.2013.06.016

A set of automatic detection and protection device of the laser was designed in order to realize the automatic detection and protection against arbitrary wavelength laser according to the principle of phototriode,electromagnetic relay and liquid crystal electro-optic effect experiments. Based on the theoretical analysis and experimental verification, phototriode photocurrent was formed when exposed to the laser radiation. The amplification circuit and an electromagnetic relay switch were used to control the output voltage of 5V and close liquid crystal voltage switch in a short time. When subjected to laser irradiation, the liquid crystal screen was substantially opaque, and returned to the transparent state at the end of the laser pulse. The results showed a design of laser protective glasses, blocking the laser irradiation and allowing ordinary bright light through at ordinary time.

Automatic laser detection and protection device based on LCD light switch

Corresponding author: ZHANG Ya-ping, zhangyp@upc.edu.cn

1. College of Science, China University of Petroleum(East China), Qingdao 266580, China

Received Date: 2013-02-25

Accepted Date: 2013-04-22

Available Online: 2013-11-25

Abstract: A set of automatic detection and protection device of the laser was designed in order to realize the automatic detection and protection against arbitrary wavelength laser according to the principle of phototriode,electromagnetic relay and liquid crystal electro-optic effect experiments. Based on the theoretical analysis and experimental verification, phototriode photocurrent was formed when exposed to the laser radiation. The amplification circuit and an electromagnetic relay switch were used to control the output voltage of 5V and close liquid crystal voltage switch in a short time. When subjected to laser irradiation, the liquid crystal screen was substantially opaque, and returned to the transparent state at the end of the laser pulse. The results showed a design of laser protective glasses, blocking the laser irradiation and allowing ordinary bright light through at ordinary time.

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Reference (7)

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[4]	LI Sh G,ZHANG Y P,ZHU H F.Physics experiment of college[M].Beijing:Science Press,2012:266-273(in Chinese).
[5]	LU R L.Phototriode[J].Applications of IC,1988,8(3):31-33(in Chinese).
[6]	LUO Zh K,LIU H F,SUN R,et al.Research of the automatic verification device and testing technology for laser protective spectacles[J].Chinese Medical Equipment,2009,30(7):17-20(in Chin-ese).
[7]	CHEN B R,YU B,ZHU X B.Dependence of response speed on structure parameters of phototransistors[J].Semiconductor Opto-electronics,2000,21(1):59-65(in Chinese).

[1]	FU Y F,HOU Q Z.Laser performance and occupational hazard[J].Industrial Safety and Dust Control,1998(1):18-20(in Chin-ese).
[2]	FENG S Y,ZHANG Y Y,LI B,et al.The harm of laser to eyes and the importance of laser protection[J].Laser Journal,1999,20(2):8-15(in Chinese).
[3]	ZHANG Q T,XU Zh Z,FU Zh X,et al.Study and application of laser protective materials[J].Nanjing University of Chemical Technology,2001,23(3):82-86(in Chinese).
[4]	LI Sh G,ZHANG Y P,ZHU H F.Physics experiment of college[M].Beijing:Science Press,2012:266-273(in Chinese).
[5]	LU R L.Phototriode[J].Applications of IC,1988,8(3):31-33(in Chinese).
[6]	LUO Zh K,LIU H F,SUN R,et al.Research of the automatic verification device and testing technology for laser protective spectacles[J].Chinese Medical Equipment,2009,30(7):17-20(in Chin-ese).
[7]	CHEN B R,YU B,ZHU X B.Dependence of response speed on structure parameters of phototransistors[J].Semiconductor Opto-electronics,2000,21(1):59-65(in Chinese).

Automatic laser detection and protection device based on LCD light switch

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通讯作者: 陈斌, bchen63@163.com

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