Excelitas Technologies® Corp. recently announced that its photodiode technology was used in the Laser Interferometer Gravitational-Wave Observatory (LIGO) discovery that recently confirmed yet another prediction of Einstein’s general theory of relativity. The Excelitas YAG-444AH Silicon PIN Photodiode monitored YAG wavelength laser beam quality. The Excelitas’ C30665GH InGaAs PIN Photodiode detected the effect of gravitational waves after they traveled through the interferometers’ 4km-long arms.
Researchers say the chamber will help develop and validate cameras’ and sensors’ abilities to penetrate fog, knowledge that could lead to improved surveillance at sites. The chamber also could be used to answer fundamental optics questions, which in time could lead to improved security camera lenses and medical imaging equipment, safer aircraft landings and better vision for drivers in fog.
Gentec Electro-Optics, Inc. will show its new Pronto Handheld Laser Power Meter, capable of measurements up to 250 W, for the first time at the Laser World of Photonics show in Munich in June, and the Pronto-250 and Pronto-250-CO2 will be available for delivery in July 2015.
Marco Snikkers wrapped up our Photonics West 2016 coverage by introducing us to a pixel sensor that acts as an 8-channel spectrometer for biomedical, fluorescence marking, and colorimeter applications, as well as a multi-spectral camera that can monitor specific wavelengths in real-time.
First Sensor’s Paul Sharman took time out of a busy day one of the exhibition to catch us up on some recent product releases.
Sensors Unlimited — UTC Aerospace Systems cut the ribbon on their new facility on September 17th, 2014. Doug Malchow spent a few minutes with us explaining how the move to a bigger and better place has already resulted in better quality imaging detectors with lower defects, lower bad pixel counts, and much lower dark current.
Jeff Eng, applications engineer with Hamamatsu, shows us a MEMS FTIR engine for IR spectroscopy instruments that works in applications involving gas sensing, materials analysis, and point of care devices. He also introduces us to 2D InGaAs image sensors for thermal imaging monitors, NIR image detection, and foreign object detection; compact radiation detectors; and more.
Excelitas and Qioptiq have joined together to provide custom optics manufacturing and a wide array of sensor offerings for various applications.
Opto Diode’s national sales manager Stan Duda kept us up to date on some new developments at Opto Diode. Watch the video to learn more about a new EUV compatible position sensing detector covering the 0.1 nm to 400 nm spectral range.
Paul Sharman, First Sensor vice president of sales and marketing, walked us through the booth to point out some of the more notable displays, and gave us an examples of a real world application in which his company’s products are being used.
LIGHT SENSORS & DETECTORS
A light sensor is a device senses or detects light. Various available kinds of light sensors and detectors function in different ways to give required results.
Active pixel sensors which are image sensors comprises of an integrated circuit with a number of pixel sensors. Each individual pixel has a light sensor as well as an active amplifier.
Charge-coupled devices (CCD)
These are applied in recording of images in astronomy, digital cinematography and digital photography.
A silver halide molecule is split into an atom of metallic silver and a halogen atom; the photographic developer causes adjacent molecules to split similarly. An example is a photographic plate.
They are sensitive enough to measure and determine the energy of single x-ray, visible and infrared photons.
They are normally quantum devices where individual photons produces a discrete effect when exposed to light. This makes Optical detectors to behave like thermometers by responding solely to the heating effect of the incoming radiation.
Photo resistors or Light Dependent Resistors (LDR)
They change resistance according to light intensity. The light then can be measured or determined by measuring the resistance.
Photovoltaic cells or solar cells
When Illuminated they produce a voltage and supply an electric current. Which means the level of illumination is directly dependent on the amount of light being supplied.
They contain a photocathode that emits electrons when illuminated. A chain of diodes then can be used to amplify the electrons.
These contain a photo cathode which when illuminated emit electrons making the tube to conduct an electric current that is proportional to the light intensity.
Has two photodiode arrays which convert light into current; one photodiode array responds to ambient light and the other responds only to infrared light; when joined with an infrared LED, this second LED array can operate as a proximity sensor.
Ambient Light Sensing Application
Ambient light sensors are incorporated in various laptops as well as cell phones to detect the lighting in the surrounding environment and appropriately adjust the backlight of the screen.