The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 1980
Filed:
Jul. 24, 1978
Benjamin G Prause, Tomball, TX (US);
John D Meyers, Plano, TX (US);
D & W International, Inc., Lafayette, LA (US);
Abstract
Pipe measuring apparatus is disclosed. In the preferred embodiment, a transmitter is arranged at one end and a receiver at the other end of the pipe. At the transmitter, there is a tone generator which transmits acoustic signal along the pipe. In addition, a power amplifier drives an output diode which transmits light of a specified frequency, and both are funneled along the pipe to be measured. At the receiving end, an amplifier picks up the sound. In like manner, the light which is transmitted through the pipe is also detected. Both detected signals are amplified. After amplification, their modulating envelopes are compared to one another. There is a time shift which is a function of transmission distance, treating the transmitted light as the reference. This time shift is converted by a scale factor into a multi-digit output. The conversion occurs through the use of a clock connected through a decimal counter which is gated on by the light signal and which is gated off by the advent of the sound signal. The output is proportionate to pipe length, and, with appropriate calibrations, length can be measured directly.