Chung Shan Institute of Science and Technology

Shin-chu Huang

Jiunn-Song Tsay

Shih-Chu Huang

Heng-Shan Hsu

Hermann Lin

Chun-Long Chang

A counting signal processing method for a fiber optic interferometric sensor including following steps is provided. An output intensity of the fiber optical interferometric sensor is converted into an electrical signal having the form V+Vcos &#x3c8;(t). Then, the number of times Nthat the maximum peak values are greater than a first counting level Sand the number of times Nthat the minimum peak values are smaller than a second counting level Swithin a specific period of time Tare counted. When the value of N, Nor (N+N) is greater than a threshold counting number C, a detectable induced signal occurring in a sensing area is inferred. Then, whether the detectable induced signals are caused by an intruder or otherwise is judged through an alarm identification logic, and an alarm device is triggered to send out an alarm according to the result of the judgment.

Counting signal processing method for fiber optic interferometric sensor

An optical intensity modulator with optimized extinction ratio (ER) is provided. The optical intensity modulator has a modulator used to receive a light source, such as a laser source, and export an optical pulse. An optical divide is used to receive the optical pulse and decouple it into a first optical pulse and a second optical pulse. An optical receiver is used to receive the first optical pulse and convert it into an electrical pulse signal. A signal processor is used to receive the electrical pulse signal from the optical receiver and digitize it into a digital reference signal. A DC-bias generator coupled to the signal processor and the modulator is used to provide a precise DC bias to the modulator according to an output of the signal processor. A current reference signals is compared with a previous reference signals and is adjusted in the signal processor so as to obtain the precise DC bias. The optical intensity modulator further includes a pulse generator, used to provide a pulse signal for the modulator and a trigger signal to the signal processor.

Growing community of inventors

Kaohsiung County, Taiwan

Jiunn-Song Tsay