Abstract: Method and apparatus for accurately determining the horizon position of a celestial body is disclosed in the form of inner and outer detector portions arranged generally-concentrically relative to an optical axis. Difference-determining electrical circuitry determines a difference between the outputs of the two detectors.
Type:
Grant
Filed:
September 11, 1989
Date of Patent:
March 10, 1992
Assignees:
Ithaco Incorporated, Space Sonics, Inc.
Abstract: Ultrasonic detection of early pregnancy in sows and like animals is enhanced by basing an assumption of pregnancy upon detection of a substantially echo-free animal zone of predetermined width or greater which may occur over a substantial range of animal depths, combined with detection of a distinct echo from a greater depth than the echo-free zone.
Type:
Grant
Filed:
August 22, 1977
Date of Patent:
September 5, 1978
Assignee:
Ithaco, Incorporated
Inventors:
Hans G. Jorgensen, B. Wendell Hautaniemi
Abstract: Trains of echo signals occurring from repetitively transmitted ultrasonic pulses are stored in a shift register in accordance with their times of occurrence, and the stages of the shift register are connected to illuminate respective light-emitting diodes arranged in a linear array, providing a display indicating the depths of density changes in animal matter or the like being inspected.
Type:
Grant
Filed:
December 16, 1974
Date of Patent:
June 22, 1976
Assignee:
Ithaco, Incorporated
Inventors:
Hans G. Jorgensen, B. Wendell Hautaniemi