Regular silicon detectors have their maximum sensitivity in the IR range, and thus behave considerably differently from human eyes. If they are used as ambient light sensors, ie to adjust display backlighting, one has to cope with inaccurate results due to differences in the IR spectra of various light sources.
Relative spectral sensitivity
Osram Opto Semiconductors' new technology silicon 'sees' the way human eyes do and is not fooled by artificial light from lightbulbs, fluorescent lamps and other light sources. Such lamps are characterised by different emission spectra which then lead to different signals at the standard sensor, even though human eyes do not recognise any difference in brightness.
Spectral emission of different light sources/sensitivity of detectors
Typical application: LCD display
Normally the sensor is mounted behind the display. The transmission factor of a transmissive or transflective LCD display is roughly 20%. To be on the safe side, the sensor has to function down to a transmission of 10%. 500 lx ambient light (ie office illumination) will result in 50 lx behind the display. This leads to a photocurrent of 30 ma. For negative displays the transmission is too low, unless the sensor is placed behind a window.
The SFH3410 chip is packed into a SMART DIL housing, resulting in a particularly compact sensor (2 x 2,5 x 1 mm). It has a typical application for the sensor to control backlighting of dashboards, audio sets and aircon units in cars as well as for portable devices and consumer applications. It can operate from -40 to +85°C.
Antennas to meet all connectivity requirements Electrocomp
Telecoms, Datacoms, Wireless, IoT
Kyocera AVX RF antennas meet today’s connectivity demands in the LTE, Wi-Fi, Bluetooth, GNSS, and ISM wireless bands, available in surface mount, patch or external configurations.
Read more...Mouser broadens its LED lineup
Opto-Electronics
Mouser has broadened its LED lineup with diverse solutions designed to support lighting, medical, and smart home applications.
Read more...Stainless steel pushbutton enclosures Electrocomp
Enclosures, Racks, Cabinets & Panel Products
he HYPB series from Hammond is a hygienic type 4X stainless steel pushbutton enclosure designed for use in environments where regular high temperature, high-pressure washdowns are required.
Read more...SMD varistors with huge surge current capability Electrocomp
Power Electronics / Power Management
TDK Corporation has introduced two new varistor series in SMD design, the larger of the two capable of handling a surge current of 10 000 A.
Read more...High-quality optoelectronics components
Opto-Electronics
LEDs make up the bulk of Lite-On’s product range, and all popular types are manufactured from the ubiquitous round LEDs designed for through-hole mounting to state-of-the-art structures, integrated with programmable control systems.
Read more...Sealed tantalum capacitors Electrocomp
Passive Components
With an operating temperature range of -55 to 125°C, with voltage derating, these capacitors have been designed especially for avionics and aerospace applications.
Read more...Analogue front end for sensor measurements Electrocomp
Analogue, Mixed Signal, LSI
The NJU9103 AFE from Nisshinbo is a tiny analogue front end, with a 16-bit resolution ADC and up to 512 x signal amplification from the programmable gain amplifier.
Read more...New series of chip-type capacitors Electrocomp
Passive Components
Panasonic Industries’ SMT capacitor series all benefit from the longest lifetime plus the lowest ESR values currently available.
Read more...SMD coupled inductors Electrocomp
Passive Components
TDK Corporation has expanded its family of flat wire inductors with the high-performance EPCOS ERUC23 coupled inductor series.
Read more...Corrosion-resistant GRP enclosures Electrocomp
Enclosures, Racks, Cabinets & Panel Products
The design offers better impact resistance, and all sizes have the additional feature of shelves moulded into the base, fitted with threaded inserts to house a PCB or other electrical equipment.
printer friendly version