Hydrophone preamplifier and calibration circuit
US4213099A · kind A · utility
2Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1978 |
| Grant date | Jul 15, 1980 |
| Priority date | — |
| Expiry date | Nov 20, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Calibration means, including an optiosolator, for a hydrophone preamplifier hich couples to a remote DC supply source and a remote load through a long, two-wire cable. The output signal of the optoisolator is fed to the amplifier in series with the hydrophone output signal, the input to the optoisolator being an AC calibration signal. In an array of preamplifiers, the same calibration signal is fed to all the preamplifiers by connecting the optoisolators in series with each other and the source of the AC calibration signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.