中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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CAS IR Grid
机构
长春光学精密机械与物... [2]
采集方式
OAI收割 [2]
内容类型
会议论文 [2]
发表日期
2005 [2]
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High energy long duration frequency-doubled Nd:YAG laser and application to veins occlusion (EI CONFERENCE)
会议论文
OAI收割
High-Power Lasers and Applications III, November 8, 2004 - November 11, 2004, Beijing, China
作者:
Li D.
;
Guo J.
;
Guo J.
;
Tang Y.
;
Zhang L.
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浏览/下载:20/0
  |  
提交时间:2013/03/25
Laser treatment represents an attractive option to other methods of vessel diseases especially varicose veins. A long pulse (30-50ms) 532nm laser (Fig.1) is used in our experiments with the pulse duration matching the thermal relaxation time of the vessels and the green laser matching the absorption spectrum peak of the blood. Laser irradiates nude vein vessels directly or exterior skin to finish operation faster and to acquire the practical data for upper enteron varicose vein treatment in several animal experiments performed in vivo. The 5J-energy pulse allows us to finely occlude rabbit or dog's vein vessels up to 2 mm in diameter when irradiating them off external skin (Fig.2). Blood vessels are occluded at once and later biopsy specimens show the immediate and long-term lasting occlusion effect. While irradiating vessels directly (Fig.3)
the vessels are usually irradiated to perforate
detailed causes are still under investigation. Animal experiments show long pulse green laser therapy is a safe and effective solution to the vein's occlusion
which promises such laser with high energy of each pulse and 30-50 ms duration is an ideal candidate for vessel diseases treatment.
The application of auto-controlled liquid crystal light valve arrays to photolithography shutter (EI CONFERENCE)
会议论文
OAI收割
ICO20: Optical Devices and Instruments, August 21, 2005 - August 26, 2005, Changchun, China
作者:
Chen Y.
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浏览/下载:12/0
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提交时间:2013/03/25
Photolithography shutter is usually used to control exposure in order to obtain patterns of code disc and metrology grating which are the core components of optical shaft encoder. But perforated film as photolithography shutter has many disadvantages such as taking too long time to perforate
easily making wrong code
lower reusable ratio. Mathematical models for resist property
luminous efficiency and exposure have been established by deducing their relations for avoiding the disadvantages
which provides the theory of using liquid crystal light valve (LCLV) replacing proforated film. Based on operating principles of LCLV and control theories of photolithography shutter
the principle diagram of control circuit of LCLV arrays has been designed according to theirs control principles. In the control system
LCLV arrays as photolithography shutter are realized by adopting DS75451 to drive them and using AT89C51 chip to control them. By photolithographic experiment
the patterns of code disc are good
the edges of lines are vertical
it indicates LCLV arrays as photolithography shutter may control exposure and light passing accords with the intending requires. It proves using LCLV arrays replacing perforated film as photolithography shutter is feasible completely.