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Path: utzoo!mnetor!uunet!tektronix!tekcrl!tekfdi!videovax!stever
From: stever@videovax.Tek.COM (Steven E. Rice, P.E.)
Newsgroups: comp.sys.amiga
Subject: Phosphors
Message-ID: <4633@videovax.Tek.COM>
Date: Tue, 20-Oct-87 12:03:00 EDT
Article-I.D.: videovax.4633
Posted: Tue Oct 20 12:03:00 1987
Date-Received: Thu, 22-Oct-87 00:45:44 EDT
References: <lots> <1950@gryphon.CTS.COM> <2538@cbmvax.UUCP>
Reply-To: stever@videovax.Tek.COM (Steven E. Rice, P.E.)
Organization: Tektronix Television Systems, Beaverton, Oregon
Lines: 18
Keywords: LP, long-persistence, smearing?

In article <2538@cbmvax.UUCP>, George Robbins (grr@cbmvax.UUCP) writes:

> . . .

> If I remember correctly, high speed oscilloscopes use a blue phospher for
> photograpy, while radar screens and other long ultra-long persistance
> display use this ugly yellow-green stuff.

The blue phosphors matched the sensitivity peak of the film, allowing
photography of fainter traces.  The "ugly yellow-green stuff" has an
amazingly long decay time (a trace is readily visible 10-20 seconds
later).

					Steve Rice

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