Apparatus including a pair of automatic gain controlled amplifiers for determining the lateral direction to a concealed conductive object
US4520317A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1983 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Jun 3, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus to measure the distance to a concealed conductive object, radiating an electromagnetic signal, has two sensors, each adapted to receive the signal and to produce an output voltage proportional to the amount of signal received. Amplifier means amplify the output voltage. Automatic gain control means automatically controls the gain to the amplifier means such that the gain of the amplification of one of the output voltages is the same as the gain of the amplification of the other output voltage. Computing means calculate the distance based upon the two amplified output voltages. Display means display the calculated value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.