Abstract: By means of sonic or ultrasonic energy, flow rate is determined as a linear function of the difference between two frequencies by taking measurements in the direction of flow and in the direction opposite thereto. Transducers are used alternately as generators and pickups. To this end, the transit time difference is determined by means of a phase detector, and the frequencies of two oscillators are readjusted in accordance with the results of the measurements. The difference frequency can be indicated and calibrated in flow rate, and the number of cycles can be counted, the flow volume being directly proportional thereto.
Type:
Grant
Filed:
April 14, 1976
Date of Patent:
January 24, 1978
Assignee:
International Telephone and Telegraph Industries
Abstract: An electrical equipment unit useful for automobiles. The unit includes a box-like case that contains one or more flexible printed circuits. Part of the flexible printed circuit is rigidized to form part of the structure of the unit. The rigidized part is fitted into the case. Electrical components are supported on the rigidized part of the flexible circuit.
Type:
Grant
Filed:
January 26, 1976
Date of Patent:
October 18, 1977
Assignee:
International Telephone and Telegraph Industries