Engineering topics

Parr, A. C.

Publications and source records attributed to Parr, A. C..

2 records

NASA NTRS1980

Sensor/amplifier for weak light sources

Light sensor/amplifier circuit detects weak light converts it into strong electrical signal in electrically noisy environment. Circuit is relatively simple and uses inexpensive, readily available components. Device is useful in such applications as fire detection and photographic processing.

Desmet, D. J.↗

NASA NTRS1979

Determination of total surface reflectivity

Method of measuring total reflectance employs relatively inexpensive reflectometer with gold-coated hemispherical reflector. Light sources may be tungsten lamp for visable region, or Globar lamp for infrared.

Desmet, D. J.↗