Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1994-09-13
1996-04-30
Strecker, Gerard R.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324 67, 342 27, 342 94, G01S 1304, G01R 2700, G01R 2902, G01V 317
Patent
active
055128343
ABSTRACT:
An electromagnetic detector is designed to locate an object hidden behind a separator or a cavity within a solid object. The detector includes a PRF generator for generating 2 MHz pulses, a homodyne oscillator for generating a 2 kHz square wave, and for modulating the pulses from the PRF generator. A transmit antenna transmits the modulated pulses through the separator, and a receive antenna receives the signals reflected off the object. The receiver path of the detector includes a sample and hold circuit, an AC coupled amplifier which filters out DC bias level shifts in the sample and hold circuit, and a rectifier circuit connected to the homodyne oscillator and to the AC coupled amplifier, for synchronously rectifying the modulated pulses transmitted over the transmit antenna. The homodyne oscillator modulates the signal from the PRF generator with a continuous wave (CW) signal, and the AC coupled amplifier operates with a passband centered on that CW signal. The present detector can be used in several applications, including the detection of metallic and non-metallic objects, such as pipes, studs, joists, nails, rebars, conduits and electrical wiring, behind wood wall, ceiling, plywood, particle board, dense hardwood, masonry and cement structure. The detector is portable, light weight, simple to use, inexpensive, and has a low power emission which facilitates the compliance with Part 15 of the FCC rules.
REFERENCES:
patent: 3392384 (1968-07-01), Wesch
patent: 3806795 (1974-04-01), Morey
patent: 3967282 (1976-06-01), Young et al.
patent: 4028707 (1977-06-01), Young et al.
patent: 4052666 (1977-10-01), Fletcher et al.
patent: 4062010 (1977-12-01), Young et al.
patent: 4072942 (1978-02-01), Alongi
patent: 4381544 (1983-04-01), Stamm
patent: 4905008 (1990-02-01), Kawano
patent: 4983914 (1991-01-01), Baranski
Sartorio Henry P.
Strecker Gerard R.
The Regents of the University of California
LandOfFree
Homodyne impulse radar hidden object locator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Homodyne impulse radar hidden object locator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Homodyne impulse radar hidden object locator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-631258