Photonic field probe and calibration means thereof
US6215295A · kind A · utility
Inventor
Key dates
| Filing date | Jul 24, 1998 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Jul 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R1/06772
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photonic radio-frequency (RF) field probe for detecting and measuring RF fields incorporates a probe head, a fiber cable and a photodetector/power-laser unit. An antenna drives a small, fiber-coupled laser, biased by a fiber-coupled optical power converter through series resistors, together with electrical connections and supporting apparatus. Methods of calibration include use of a reference oscillator in the probe head, use of the relationship between optical power sent to the optical power converter and resulting photodetector signal, and measurement of signal-fiber attenuation from light reflected by the laser in the probe head. Other probe embodiments utilize a reflective multiple quantum well modulator and embodiments which measure all three directional components of the RF field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.