Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1985-07-08
1987-11-24
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324115, 324233, 340347M, 340347CC, G01V 311, G01V 365, G01R 1508, H03M 106
Patent
active
047092130
ABSTRACT:
A metal detector circuit includes a transmit coil (12) and a receive coil (56) arranged in a balanced induction configuration in an electromagnetic field. The receive signal from the receive coil (56) is input to electronic switches (146, 148) which receive quadrature reference inputs from a phase shift circuit (112). The phase demodulated outputs of the switches (146, 148) are passed through amplifiers and input to an analog-to-digital converter (324) to produce digital signal samples which are transmitted through a bus (326). The bus (326) is connected to random access memory (414, 416) and a read only memory (418) which includes a stored signal processing program. A microprocessor (374) is connected to the bus (376) for receiving the digital signal samples and the stored program from memory (418). The microprocessor (374) executes the stored signal processing program to produce a digital output signal which is transmitted through the bus (326) to a digital-to-analog converter (360). The converter (360) produces an analog output signal which is passed to an output driver circuit which produces a target indication signal at a speaker (284). The digital signal processing provided by the microprocessor (374) includes concurrent ground cancellation and discrimination without the need for operator selection of these functions. The digital output produced by the microprocessor (374), upon detection of an object in the electromagnetic field, can be displayed in digital readouts (474-482).
REFERENCES:
patent: 2497961 (1950-02-01), Shaw
patent: 2608602 (1952-08-01), Muffly
patent: 3030470 (1962-02-01), Shawhan et al.
patent: 3147429 (1964-09-01), Moran
patent: 3202909 (1965-08-01), Stewart
patent: 3209245 (1965-09-01), Hauge
patent: 3214686 (1965-10-01), Elliot et al.
patent: 3315155 (1967-04-01), Colani
patent: 3328679 (1967-06-01), Sloughter
patent: 3337796 (1967-08-01), Hentschel et al.
patent: 3344346 (1967-09-01), Halsey
patent: 3355658 (1967-11-01), Gardiner
patent: 3383594 (1968-05-01), Florletta et al.
patent: 3391336 (1968-07-01), Hentschel
patent: 3453532 (1969-07-01), Gardiner
patent: 3467855 (1969-09-01), Pance
patent: 3471773 (1969-10-01), Penland
patent: 3487294 (1969-12-01), Youmans et al.
patent: 3492564 (1970-01-01), Baker, Jr.
patent: 3519919 (1970-07-01), Rance
patent: 3555408 (1971-01-01), Robinson
patent: 3559041 (1971-01-01), Trigg
patent: 3573784 (1971-04-01), Bachofer et al.
patent: 3601691 (1971-08-01), Gardiner
patent: 3614600 (1971-10-01), Ronka
patent: 3626279 (1971-12-01), Walden
patent: 3662255 (1972-05-01), Garrett
patent: 3676772 (1972-07-01), Lee
patent: 3686564 (1972-08-01), Mallick, Jr. et al.
patent: 3721859 (1973-03-01), Blanyer
patent: 3742341 (1973-06-01), Clowes et al.
patent: 3758849 (1973-09-01), Susman et al.
patent: 3760400 (1973-09-01), Galvin et al.
patent: 3763424 (1973-10-01), Bennett, Jr. et al.
patent: 3784899 (1974-01-01), Chalfin
patent: 3823365 (1974-07-01), Anderson
patent: 3828242 (1974-08-01), Vann
patent: 3848182 (1974-11-01), Gerner et al.
patent: 3852659 (1974-12-01), Barringer
patent: 3852663 (1974-12-01), Brooks et al.
patent: 3872380 (1975-03-01), Gardiner
patent: 3896371 (1975-07-01), Hametta
patent: 3906376 (1975-09-01), Bass
patent: 3950695 (1976-04-01), Barringer
patent: 3950750 (1976-04-01), Churchill et al.
patent: 3961238 (1976-06-01), Randolph, Jr.
patent: 3972041 (1976-07-01), Howard
patent: 3986104 (1976-10-01), Randolph, Jr.
patent: 3999965 (1976-11-01), Purinton et al.
patent: 4008469 (1977-02-01), Chapman
patent: 4016486 (1977-04-01), Pecori
patent: 4024468 (1977-05-01), Hirschi
patent: 4053885 (1977-10-01), Tomita et al.
patent: 4086527 (1978-04-01), Cadot
patent: 4096432 (1978-06-01), Spencer
patent: 4099116 (1978-07-01), Tyndall
patent: 4110679 (1978-08-01), Payne
patent: 4128803 (1978-12-01), Payne
patent: 4130792 (1978-12-01), Sullivan
patent: 4204160 (1980-05-01), Voll
patent: 4207520 (1980-06-01), Flora et al.
patent: 4213093 (1980-07-01), Pecori
patent: 4230987 (1980-10-01), Mordwinken
patent: 4249128 (1981-02-01), Karbowski
patent: 4255710 (1981-05-01), Weber
patent: 4255711 (1981-03-01), Thompson
patent: 4263553 (1981-04-01), Cook et al.
patent: 4303879 (1981-12-01), Podhrasky
patent: 4321583 (1982-03-01), Baron et al.
patent: 4322683 (1982-03-01), Vieira et al.
patent: 4326166 (1982-04-01), Pigeon et al.
patent: 4331920 (1982-05-01), Kalisch et al.
patent: 4348639 (1982-09-01), Karbowski
patent: 4383218 (1983-05-01), Hansen et al.
patent: 4455529 (1984-06-01), Sinclair
patent: 4517550 (1985-05-01), Nakamura et al.
patent: 4556846 (1985-12-01), D'Hondt
patent: 4563645 (1986-01-01), Kerr
patent: 4564809 (1986-01-01), Huschelrath et al.
Lancaster, Donald E. Electronic Metal Locators Basic Types and Design Factors Electronics World Dec. 1966 pp. 39-42 and 62.
Fisher, "M-Scope VLF 553D Detector Dual System Discriminator With Iso-Plannar Search Head Operator's Manual."
"Pulse Induction Metal Detectors," Published By Pulse Induction, Ltd., London.
"Auto-Pulse 1," A New Concept In Metal Detection.
Colani, C., "A New Type Of Locating Device," Archaeometry, vol. 9, 1969.
"Operation, Maintenance, Overhaul And List Of All Parts Manual For Detecting Set, Mine, Portable, Metallic Model P-158" Polan Industries, Inc.
"Operation, Maintenance, Overhaul And List Of All Parts Manual For Detecting Set, Mine, Aural Indication, 10-Volt DC . . . Woodcase," Oregon Technical Products, Aug. 9, 1963.
Garrett Electronics, Inc.
Strecker Gerard R.
LandOfFree
Metal detector having digital signal processing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Metal detector having digital signal processing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metal detector having digital signal processing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2424737