| 摘要 |
Methods and apparatus enable compensation of source light wavelength fluctuations due to instability of a broadband source within an optical sensing system such as a fibre Bragg grating sensor for strain, displacement, flow, corrosion, chemical composition, temperature or pressure, or a gyroscope. Two or more portions of the light output from the source are tapped off at specific wavelength bands (e.g. using grating filters) and the power of these portions is measured and divided to form their ratio (quotient). The ratio is used as feedback to control the source or to adjust the sensor response to signals received at a receiver. |
