Photodetector circuit for an electronic sprayer

Details Photodetector circuit for an electronic sprayer Photodetector circuit for an electronic sprayer

1996-08-28

1998-06-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

350 59, 350308, 327561, H01J 4014

Patent

active

057638730

ABSTRACT:
An agricultural implement for spraying herbicide on weeds in a field without spraying herbicide on bare soil includes a photodetector circuit. The photodetector circuit includes a photodetector and an active filter. The photodetector is not AC coupled in parallel with an inductor/capacitor resonant circuit which tunes the active filter. As a result, changes in photodetector capacitance due to changes in ambient lighting conditions are not impressed across the resonant inductor/capacitor circuit and therefore do not adversely change the frequency and phase characteristics of the photodetector circuit.

REFERENCES:
patent: 2514405 (1950-07-01), Marihart
patent: 2682132 (1954-06-01), Marihart
patent: 2894178 (1959-07-01), Chesebrough et al.
patent: 3373870 (1968-03-01), Black et al.
patent: 3488511 (1970-01-01), Mori et al.
patent: 3512587 (1970-05-01), Shader
patent: 3590925 (1971-07-01), Troutner
patent: 3609913 (1971-10-01), Rose
patent: 3652844 (1972-03-01), Scott, Jr.
patent: 3701218 (1972-10-01), Priest
patent: 3821550 (1974-06-01), Priest
patent: 3910701 (1975-10-01), Henderson et al.
patent: 4013875 (1977-03-01), McGlynn
patent: 4015366 (1977-04-01), Hall, III
patent: 4029391 (1977-06-01), French
patent: 4092800 (1978-06-01), Wayland, Jr. et al.
patent: 4179216 (1979-12-01), Theurer et al.
patent: 4206569 (1980-06-01), Randolph
patent: 4354339 (1982-10-01), Nokes
patent: 4369886 (1983-01-01), Lane et al.
patent: 4482960 (1984-11-01), Pryor
patent: 4527897 (1985-07-01), Okabe
patent: 4550526 (1985-11-01), Smucker
patent: 4558786 (1985-12-01), Lane
patent: 4618257 (1986-10-01), Bayne et al.
patent: 4626678 (1986-12-01), Morita et al.
patent: 4626993 (1986-12-01), Okuyama et al.
patent: 4628454 (1986-12-01), Ito
patent: 4630773 (1986-12-01), Ortlip
patent: 4674048 (1987-06-01), Okumura
patent: 4699273 (1987-10-01), Suggi-Liverani et al.
patent: 4709265 (1987-11-01), Silverman et al.
patent: 4709505 (1987-12-01), Lempa, Jr.
patent: 4731529 (1988-03-01), Ohsawa
patent: 4744207 (1988-05-01), Hanley et al.
patent: 4768713 (1988-09-01), Roper
patent: 4768715 (1988-09-01), Sali et al.
patent: 4789777 (1988-12-01), Takami et al.
patent: 4878598 (1989-11-01), Ruschhaupt, Jr.
patent: 4991341 (1991-02-01), Douglas
patent: 5015868 (1991-05-01), Park
patent: 5021645 (1991-06-01), Satula et al.
patent: 5050771 (1991-09-01), Hanson et al.
patent: 5068540 (1991-11-01), Tsuji
patent: 5072128 (1991-12-01), Hayano et al.
patent: 5099113 (1992-03-01), Oi et al.
patent: 5109161 (1992-04-01), Horiuchi et al.
patent: 5144767 (1992-09-01), McCloy et al.
patent: 5222324 (1993-06-01), O'Neall et al.
patent: 5237386 (1993-08-01), Harley
patent: 5278423 (1994-01-01), Wangler et al.
patent: 5296702 (1994-03-01), Beck et al.
patent: 5319196 (1994-06-01), Cleven
patent: 5386285 (1995-01-01), Asayama
patent: 5389781 (1995-02-01), Beck et al.
patent: 5481104 (1996-01-01), Miller et al.
patent: 5507115 (1996-04-01), Nelson
patent: 5585626 (1996-12-01), Beck et al.
patent: 5650748 (1997-07-01), Johnston et al.
patent: 5670775 (1997-09-01), Abraham et al.
Proceedings of the 1991 Symposium, American Society of Agricultural Engineers, W. L. Felton et al., "A Microprocessor Controlled Technology To Selectively Spot Spray Weeds", 8 pages (Dec. 16-17 1991).
B. B. Nitsch et al., "Visible And Near Infrared Plant, Soil And Crop Residue Reflectivity For Weed Sensor Design", American Society of Agricultural Engineers, Jun. 23-26, 1991).
Geoffrey J. Shropshire et al., "Fourier and Hadamard Transforms For Detecting Weeds in Video Images", pp. 1-18, American Society of Agricultural Engineers, (Dec. 12-15, 1989).
Geoffrey J. Shropshire et al., "Optical Reflectance Sensor for Detecting Plants", SPIE vol. 1379, pp. 222-235, (1990). no month.
"Sucker Punch", California Farmer, p. 18 (Feb. 1995).
"A New Age of Weed Control", Kelly Baron, The Grower, pp. 20-24 (Feb. 1993).
Patchen On Target, 4 pages (Fall 1994). (no month).
"The Newest Weedseeker is a Hit", Patchen On Target, 4 pages, (Spring 1995). (no month).
"Waging War on Weeds", Grape Grower, Marni Katz, vol. 27, No. 9, 4 pages (Sep. 1995).
Patchen On Target, 4 pages, (Winter 1993). (no month).
Patchen On Target, 4 pages (Spring 1994). (no month).
Patchen Selective Spray Systems, "Reduced Herbicide Usage is Perennial Crops, Row Crops, Fallow Land and Non-Agricultural Applications Using Optoelectronic Detection", 10 pages, (1994).

Affiliated with

Also associated with

Rating

Photodetector circuit for an electronic sprayer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photodetector circuit for an electronic sprayer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photodetector circuit for an electronic sprayer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2202915