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參數(shù)資料
| 型號(hào)： | 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)： | 30/76頁 |
| 文件大?。?/td> | 1240K |
| 代理商： | VT900 |
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25
Application Notes—Photoconductive Cells
Factoring in the power outputs of the LEDs, in this case at a forward
drive current of 10 ma, coupling factors (matching factor multiplied by
power output) for the various LED/material type combinations can be
generated.
Normalized LED/Photocell Coupling Factors @ 10 mA
Once gain, this data is intended as a general guide. LED power
outputs can vary 5:1 between manufacturer lots.
APPLICATION NOTE #5
Assembly Precautions
When soldering the cell leads take all measures possible to limt the
amount of heating to the photocell. The maximumrecommended
soldering temperature is 250°C with a solder duration of 5 seconds.
Heat sink the LEDs if possible. Keep soldering iron 1/16 inch (1.6 mm)
mnimumfrombase of package when soldering.
Avoid chemcals which can cause metal corrosion. Do not clean the
plastic coated cells with organic solvents (ketone types). Check with
factory for specific cleaning recommendations.
Finally refrain fromstoring the cells under high temperature and/or
humdity conditions. If cells are stored in the dark for any length of time
please “l(fā)ight adept” before testing (see section on Light History Effect).
Storage in the dark will change both the sensitivity and decay time of
the cell.
APPLICATION NOTE #6
A LowCostLightSource for Measuring
Photocells
T
he Light Source used in the measurement of photocell resistance
must be characterized for intensity and spectral composition.
PerkinElmer uses a tungsten filament lamp having a spectral output
approximating a black body @ 2850 K with a known candlepower
output at a specified voltage and current.
While calibrated lamps of this type are available fromthe National
Institute of Standards and Technology (formerly NBS) and private
testing labs, a low cost alternative is to use a 100 W inside frosted,
tungsten filament lamp available fromany home or hardware store.
Such a lamp operated at 120 VAC will produce approximately 90
candlepower (cp) of illumnation and a color temperature of 2700 K to
2800 K.
The relationship between candlepower and footcandle is:
Since this equation assumes a point source of light, the distance
between lamp and detector should be at least five times the lamp
diameter.
There are some characteristics of incandescent lamps which should
be noted:
1.
Color temperature increases with increasing wattage.
2.
When operated at a constant current, light output rises with time.
LED Type
λ
P
(nm)
569
58
635
655
66
697
880
940
Type
Type 3
GaP
3%
5%
17%
11%
47%
47%
—
—
3%
5%
13%
9%
35%
31%
—
—
GaAsP/GaP
GaAsP/GaP
GaAsP/GaAs
AIGaAs
GaP/GaP
GaAIAs
GaAs
footcandle
candle power
distance in feet
(
)
2
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