P3D Heat Study part 1 of 7 (Overview)

[Tom Hubin <thubin@xxxxxxxxx>]

Hello,

A couple of weeks ago I posted my 5 page report on a TDC116 projector
that has been known to damage film and plastic mounts due to excessive
heat. I want to thank the several people who read it and commented. 

It has been brought to my attention that many of this group cannot just
click on the link to
http://www.clark.net/pub/thubin/aosd/photo3d/ir_study.txt and read the
article. It has been suggested that I post the entire report without use
of links. With this in mind I am posting the report in seven parts. 

The intent of the copyright is to give me credit for my work and keep me
from being misquoted. Permission is granted to quote and discuss freely
the contents of this report. You may also reprint it for personal use.
If you reprint it for club newsletters or other publications then I
expect you to ask my permission and send me a copy of the newsletter.

******************************************************************

        Copyright 22 January 1999, Thomas Hubin

        This document is not to be transmitted or published without 
        permission of the author. 
        
        Tom Hubin
        AO Systems Design
        13151 Larchdale Road, Suite 5
        Laurel, Maryland 20708-1719, USA
        
        Phone: 301-776-7063 (voice or fax, noon to midnight)
        Email: thubin@xxxxxxxxx
        Website: www.clark.net/pub/thubin/aosd

        Background

        My name is Tom Hubin. I am a member of the Potomac Society of 
        Stereo Photographers (PSSP). I consult under the company name of 
        AO Systems Design as an optical engineer and an electrical 
        engineer, and have some notion that I would like to design a 
        better stereo projector. With this in mind, I took advantage of 
        a recent opportunity to examine several stereo projectors at 
        very close range. 

        Project Description

        One of the PSSP club-owned TDC116s has been known to damage 
        slides and plastic mounts due to excessive heat. Another club-
        owned projector, supposedly identical to the first, does not 
        have a reputation for damaging slides or mounts, but this 
        projector also has not been used for quite a number of years. I 
        volunteered to take the projectors home and find out how they 
        differ and make recommendations for repairs and/or improvements. 

        Each of the projectors has been modified to use 750 watt BTP 
        lamps instead of the factory installed 500 watt CZX lamps. This 
        modification was intended to produce 50 percent more visible 
        light. Unfortunately, this modification also produces 50 percent 
        more infrared energy. 
 
        I also borrowed PSSP member Bill Duggan's TDC716 projector, 
        which was designed to use 750 watt DDB lamps. I wanted to see 
        what TDC had done that permitted 50 percent more heat to be 
        dissipated than in the TDC116 design. Some possible differences 
        to be considered included: more forced air, different condenser 
        optics, and different glass type or thickness for the infrared 
        absorbing filter.


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End of PHOTO-3D Digest 3209
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