Home gaussmeter with filter-integrator circuit for measuring elf radiation
US5150051A · kind A · utility
10Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Apr 11, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/028
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A meter (10) for measuring extremely-low-frequency radiation includes a coil circuit (22) whose output is filtered by a sharp-cut-off high-pass filter (24) to pass standard house-current frequencies but suppress the frequency components that would predominate as a result of movement of the meter with respect to the earth's magnetic field. An integrator (26) compensates for the frequency response of the coil circuit (22), an RMS circuit (35) converts the signal to its root-mean-square value, and a display circuit (28) provides a display determined by the resultant signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.