Title

Effect Of Phasing-Sector Angular Extent In Fm Reticles

Authors

R G. Driggers

Title - Alternative

J. Am. Water Work Assoc.

Keywords

RETICLES; FREQUENCY MODULATION; PHASE MODULATION; Optics

Abstract

A technique is presented for increasing the useful power of the FM modulation signal from a spinning FM reticle with a phasing sector. Spinning FM reticles often determine a target location by using a combination of a phasing sector to establish the angular target location and a radial frequency variation to establish the radial target location. Typically, the phasing sector of this reticle type consists of a semicircular transmissive sector with the other semicircular sector which provides FM modulation. The power of the FM modulation signal is increased by matching the phased-sector geometry to the size that corresponds to the period of the modulation frequency. This type of reticle is compared and contrasted with the more typical semicircular phasing-sector reticle in both the time and frequency domains.

Publication Title

Journal American Water Works Association

Volume

84

Issue/Number

22

Publication Date

1-1-1992

Document Type

Article

Language

English

First Page

4578

Last Page

4581

WOS Identifier

WOS:A1992GZ92000012

ISSN

0003-6935

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