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PDF ( 数据手册 , 数据表 ) VT300

零件编号 VT300
描述 Photoconductive Cells and Analog Optoisolators (Vactrols)
制造商 PerkinElmer Optoelectronics
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VT300 数据手册, 描述, 功能
Lighting
Optoelectronics
Imaging
Telecom
Sensors
Detectors and Sensors
Photoconductive Cells and
Analog Optoisolators (Vactrols®)
Specialty Lighting
Digital Imaging
Telecom
Sensors
.







VT300 pdf, 数据表
Photoconductive Cell Typical Applications
Why Use Photocells?
Photocells can provide a very economic and technically superior solution for many applications where the presence or absence of light is sensed
(digital operation) or where the intensity of light needs to be measured (analog operation). Their general characteristics and features can be
summarized as follows:
• Lowest cost available and near-IR photo detector
• Available in low cost plastic encapsulated packages as well as hermetic packages (TO-46, TO-5, TO-8)
• Responsive to both very low light levels (moonlight) and to very high light levels (direct sunlight)
• Wide dynamic range: resistance changes of several orders of magnitude between "light" and "no light"
• Low noise distortion
• Maximum operating voltages of 50 to 400 volts are suitable for operation on 120/240 VAC
• Available in center tap dual cell configurations as well as specially selected resistance ranges for special applications
• Easy to use in DC or AC circuits - they are a light variable resistor and hence symmetrical with respect to AC waveforms
• Usable with almost any visible or near infrared light source such as LEDS; neon; fluorescent, incandescent bulbs, lasers; flame sources;
sunlight; etc
• Available in a wide range of resistance values
Applications
Photoconductive cells are used in many different types of circuits and applications.
Analog Applications
• Camera Exposure Control
• Auto Slide Focus - dual cell
• Photocopy Machines - density of toner
• Colorimetric Test Equipment
• Densitometer
• Electronic Scales - dual cell
• Automatic Gain Control - modulated light source
• Automated Rear View Mirror
Digital Applications
• Automatic Headlight Dimmer
• Night Light Control
• Oil Burner Flame Out
• Street Light Control
• Absence / Presence (beam breaker)
• Position Sensor
3







VT300 equivalent, schematic
Photoconductive Cell Typical Characteristic Curves
@ 25°C Type 3 Material
Type 3 Material
This is a high speed material with a spectral response closely approximating the human eye. This material is well suited for switching
from one light level to another and offers our best temperature stability and response time. This material is often used in cameras and
industrial controls.
The resistance for any standard catalog cell is controlled at only one light level. If the resistance at other light levels is a concern,
please contact the factory.
To obtain the typical resistance versus illumination characteristic
for a specific part number:
1. Look up 2 footcandle resistance in table.
2. Insert resistance given and draw a curve through that point
and parallel to the closest member of the family of curves
shown for the appropriate type of photo-sensitive material.
Resistance vs. Illumination
Response Time vs. Illumination
(Rise Time)
Response Time vs. Illumination
(Decay Time)
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