 Vishay Intertechnology, Inc.
is adding to its Optoelectronics portfolio with a family of mid-range
infrared (IR) sensors featuring digital and analog outputs in three
package types.
- With a fast
response time of 300 microseconds and low supply current of 0.85 mA, the
industry-best detectors have a range of up to 30 meters when used as
part of an interrupter design and a range of up to three meters when
used as part of a reflective sensor.Some object
detecting sensors adjust their detection threshold depending on the
amount of ambient light and optical noise present in the environment. To
avoid false detections in the presence of noise, the gain of the
amplifier may adjust itself to such a low level that sensor
responsiveness is affected. In low ambient light conditions, the sensor
may increase its gain and make the receiver too sensitive, such that it
will detect and respond to reflected or stray light.The TSOP4038, TSOP58038, and TSOP5038 IR sensors with
digital output eliminate these problems by featuring a fixed gain. With a
fixed gain the detection threshold and resulting detection distance is
fixed. Once the design of the optical parameters such as the intensity
of the emitter, the aperture in front of the receiver, and the alignment
of emitter and detector are determined, the sensor will have stable,
repeatable performance under all lighting conditions. Many other applications require a reflective sensor that
detects not only presence but also proximity by measuring the strength
or weakness of the reflected signal. Instead of a fixed detection
threshold, analog information from the sensor is needed. This is
possible with the TSOP4P38, TSOP5P38, and TSOP58P38 IR proximity
sensors. The length of the sensor's output pulse in response to the
emitter signal varies in proportion to the amount of light reflected
from the object being detected. For near objects, the output pulse
approaches 100 % of the emitted pulse; for far objects, the output pulse
becomes shorter. Vishay's mid-range
sensors enable a wide variety of safety mechanisms and automatic
fixtures in homes, businesses, and industrial settings. Typical
applications include safety switches for garage doors, elevator doors,
gates, perimeter guards and industrial light curtains, and reflective
sensors for toilets, urinals, faucets, hand dryers, towel dispensers,
and LCD monitor power sensors. In applications such as
light curtains and perimeter guards, fast reaction times are critical.
While some sensors require the IR beam to be interrupted for up to 5 ms
before detection, Vishay's mid-range sensors require only 300
microseconds. The new IR sensors
provide shielding against EMI and a supply voltage of 2.7 V to 5.5 V. To
simplify designs, the devices feature a photo detector and preamplifier
in one package, while visible light is suppressed by an internal IR
filter. The components are compliant to RoHS 2002/95/EC and WEEE
2002/96/EC.http://www.vishay.comFor
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Vishay Intertechnology, Inc.
is adding to its Optoelectronics portfolio with a family of mid-range
infrared (IR) sensors featuring digital and analog outputs in three
package types.
