Infrared radiation detector interrogated by optical frequency-domain reflectometer

MEASUREMENT GUIDE OTDR - Optical Time Domain Reflectometer

Dynamic strain distribution monitoring of 5.5 m CFRP blade using 5 m FBGs interrogated by optical frequency domain reflectometry

We have developed an optical frequency domain reflectometry (OFDR) system which is capable of conducting distributed strain measurements with a sampling rate of 150 Hz, a spatial resolution of less than 1 mm and a sensing range of 20 m. In this study, we applied this technique to monitor dynamic strain distributions along a 5.5 m helicopter blade structure with carbon fiber reinforced plastics ...

High-resolution and high-sensitivity optical-time-domain reflectometer.

We demonstrate a photon-counting optical-time-domain reflectometer (OTDR) operating at a wavelength of 0.85 microm at room temperature with high sensitivity (3 x 10(-15) W) at high resolution (1.5 cm, 150 psec). Measurements of splice losses and Rayleigh scattering losses less then 0.1 dB with centimeter resolution are demonstrated to be possible with such an OTDR.

Detrimental Effect Elimination of Laser Frequency Instability in Brillouin Optical Time Domain Reflectometer by Using Self-Heterodyne Detection

A useful method for eliminating the detrimental effect of laser frequency instability on Brillouin signals by employing the self-heterodyne detection of Rayleigh and Brillouin scattering is presented. From the analysis of Brillouin scattering spectra from fibers with different lengths measured by heterodyne detection, the maximum usable pulse width immune to laser frequency instability is obtai...

Optical Radiation Measurements Based on Detector Standards

A near-IR radiometer standard with similar performance to silicon trap-detectors has been developed to calibrate detectors and radiometers for absolute spectral power, irradiance, and radiance responsivities between 950 nm and 1650 nm. The new radiometer standard is utilized at the Spectral Irradiance and Radiance Responsivity Calibrations using Uniform Sources (SIRCUS) which is the reference c...