Measurement system for wide dynamic range optical power meter
US7167655B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2003 |
| Grant date | Jan 23, 2007 |
| Priority date | — |
| Expiry date | Jan 12, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0014
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measurement system for wide dynamic range operation in optical power measurement applications is disclosed. The system provides amplification over a wide dynamic range without glitch, signal loss or transient effect during range switch. This is achieved by combining first and second multi-gain photodiode amplifiers (10/1,10/2), with their input ports connected in common to receive the input signal from a photodiode, and by switching their gain settings to get continuous readings of a photodiode signal. More specifically, the gain setting of the first amplifier is changed only when the signal from the other amplifier is being output, and vice versa. Such an amplification system ensures a smooth transition within a wide dynamic range while monitoring various signal levels, e.g., monitoring processes with substantial variations of optical power from very high levels to very low levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.