VT400 PerkinElmer Optoelectronics, VT400 Datasheet - Page 27
![no-image](/images/no-image-200.jpg)
VT400
Manufacturer Part Number
VT400
Description
Photoconductive Cells and Analog Optoisolators (vactrols)
Manufacturer
PerkinElmer Optoelectronics
Datasheet
1.VT400.pdf
(76 pages)
- Current page: 27 of 76
- Download datasheet (902Kb)
Application Notes—Photoconductive Cells
APPLICATION NOTE #1
Light - Some Physical Basics
Light is produced by the release of energy from the atoms of a material
when they are excited by heat, chemical reaction or other means. Light
travels through space in the form of an electromagnetic wave.
A consequence of this wave-like nature is that each “color” can be
completely defined by specifying its unique wavelength. The
Direct Sunlight
Overcast Day
Twilight
Full Moon
Clear Night Sky (moonless)
Sky Condition
(To X-rays and Gamma Rays)
Ultraviolet
Natural Illuminance
Light Level (Typical)
10000 fc
0.001 fc
1000 fc
0.1 fc
1 fc
Violet
400
Violet
Blue
Green
Yellow
Orange
Red
Visible Light
22
Below 450 nm
450 - 500 nm
500 - 570 nm
570 - 590 nm
590 - 610 nm
610 - 700 nm
wavelength is defined as the distance a wave travels in one cycle.
Since the wavelengths of light are very short they are normally
measured in nanometers, one nanometer being equal to 1 x 10
meters.
The spectral response of PerkinElmer’s photoconductors are specified
by lots of relative response versus wavelength (color) for various
material types.
Candle - Lit Room
Auditorium
Classroom
Inspection Station
Hospital Operating Room
Lighting Condition
700
Red
Room Illumination
(To Radar Waves)
Infrared
Light Level (Typical)
500 - 1000 fc
250 fc
10 fc
30 fc
5 fc
Wavelength
-9
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