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:
Feb. 17, 1981
Filed:
Sep. 20, 1978
Wilfried Sartorius, Steinen, DE;
Don J Stock, Schopfheim-Langenau, DE;
Endress u. Hauser GmbH u. Co., Maulburg, DE;
Abstract
A method and a circuit arrangement for time stabilization of scanning pulses for the stroboscopic sampling of periodically recurring signals. Stroboscopic sampling is performed by means of scanning pulses having a repetition period slightly different from the period of the recurring signals to be scanned. The signals to be scanned are transmitted over a transmission line in which a measuring section of known length is defined by the distance between two tapping points to each of which a sampling circuit is connected. The signals transmitted over the transmission line are sampled stroboscopically by means of the scanning pulses whereby time-transformed signals are obtained. These time-transformed signals are separated by a time interval corresponding to the transit time of the signals in the measuring section multiplied by the time-transformation factor. The number of scans occurring in this time-interval is counted and compared with a given desired number; if there is a difference between the two compared numbers, the scanning pulse period is changed so as to eliminate this difference. In an alternative embodiment, the measuring section is defined by a transmission line section of different characteristic impedance, and the recurrent signals are sampled at a single tapping point ahead of this transmission line section; in this case the time-interval corresponding to the transit time is determined by means of the reflexions occurring at the impedance breaks.