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Measurement of Visual Index in Tunnels Using Automatic Gain Controlled Laser Diodes and a Homodyne Detection Scheme by Jongtaek Park; Donghyun Seo; Bonjeong Koo; Youngil Park is a Engineering article available to read on EtoBox.

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A visual index measurement scheme that can be applied to a tunnel environment is proposed. To check the ventilation condition, a relative visibility is measured using a laser diode (LD) with wavelength of 880 nm. The LD is modulated with a 10 kHz sinusoidal signal to be used for a homodyne detection, which helps avoiding environmental noises. Both an automatic power control (APC) and an automatic gain control (AGC) circuits are adopted for stabilizing the optical source. Measurements are done in bidirectional ways and then averaged. Final results show that the proposed scheme works well even in harsh conditions.

Who reads Measurement of Visual Index in Tunnels Using Automatic Gain Controlled Laser Diodes and a Homodyne Detection Scheme?

Author

Jongtaek Park; Donghyun Seo; Bonjeong Koo; Youngil Park

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0030-4018)

Published

2004

Language

EN

Field

Engineering (Physical Sciences)