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參數(shù)資料
| 型號： | VT900 |
| 廠商： | PerkinElmer Inc. |
| 英文描述： | Photoconductive Cells and Analog Optoisolators (Vactrols) |
| 中文描述： | 光導(dǎo)細(xì)胞和模擬光隔離器（Vactrols） |
| 文件頁數(shù)： | 29/76頁 |
| 文件大?。?/td> | 1240K |
| 代理商： | VT900 |
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24
Application Notes—Photoconductive Cells
LED Light Sources
APPLICATION NOTE #4
Spectral Matching ofLEDs and
Photoconductive Types
Since light sources and light detectors are almost always used
together the designer must take into consideration the optical coupling
of this systemor the ability of the detector to “see” the light source.
In order to have good optical coupling between the emtter and the
conductor the spectral output of the light source must, to some degree,
overlap the spectral response of the detector. If the design involves the
use of a light source with a broad band spectral output the designer is
assured that the photocell will have good response to the light. This
may not be the case when an LED light source is employed. LEDs emt
their light within a very narrow spectral band so that they are often
considered to be emtting at only on (peak) wavelength.
Spectral matching factors were calculated for a number of different
LEDs and the photoconductor material types manufactured by
PerkinElmer. Each matching factor was derived by multiplying the
detector response curves by the LED spectral output curve and then
measuring the resulting area.
The LED/photocell matching factors listed are independent of power
output fromthe LEDs. In order to get a real feel on how well any LED/
photocell pair couple together, the power output fromthe LED at a
particular forward drive current must be considered.
Normalized LED/Photocell Matching
The intensity of the light being emtted by visible LEDs is often given in
units of mllicandela. Mllicandela is photometric unit of measure which
assumes the human eye as the detector. For most detectors other than
the human eye the most convenient systemfor measurement is the
radiometric system Listed below is the typical light power output of
some LEDs measured at two different forward drive currents. Note that
LEDs of a given type can show a 5:1 manufacturing spread in power
outputs.
LED Type
Color
λ
P
GaP
GREEN
YELLOW
ORANGE
RED
RED
RED
INFRARED
INFRARED
569 nm
585 nm
635 nm
655 nm
660 nm
697 nm
880 nm
940 nm
GaAsP/GaP
GaAsP/GaP
GaAsP/GaAs
AIGaAs
GaP/GaP
GaAIAs
GaAs
LED Type
λ
P
(nm)
569
58
635
655
66
697
880
940
Type Material
Type 3 Material
GaP
39%
60%
49%
31%
31%
47%
—
—
40%
52%
38%
27%
27%
31%
—
—
GaAsP/GaP
GaAsP/GaP
GaAsP/GaAs
AIGaAs
GaP/GaP
GaAIAs
GaAs
LED Type
Color
λ
P
(nm)
Power Output
I
f
= 1 mA
1.2 μW
0.3 μW
3.2 μW
6.2 μW
33.8 μW
54.3 μW
76.8 μW
35.5 μW
I
f
= 10 mA
24.1 μW
26.2 μW
101.9 μW
102.1 μW
445.1 μW
296.2 μW
1512.3 μW
675.0 μW
GaP
GREEN
YELLOW
ORANGE
RED
RED
RED
INFRARED
INFRARED
569 nm
585 nm
635 nm
655 nm
660 nm
697 nm
880 nm
940 nm
GaAsP/GaP
GaAsP/GaP
GaAsP/GaAs
AIGaAs
GaP/GaP
GaAIAs
GaAs
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