The multiple award winning SpectralLED® tuneable visible light sources from Gamma Scientific combine the output of nearly three dozen discrete LEDs – each having a different centre wavelength – to produce output that can be programmed to closely match virtually any illuminant source or the spectrum of any illuminant reflected by a target.
The RS-7-SWIR model is fitted with nine short-wave infrared wavelengths for synthesis of commercially available light sources, making it well-suited for calibration and testing of night vision sensors, remote sensing sensors and industrial monitoring equipment.
SpectraLED® Family of Tuneable Light Sources
- RS-7-1 Benchtop
75 mm output port & integral integrating sphere
- RS-7-2 Large Output Port
Exit ports ranging up to 600 mm
- RS-7-3 Fiber Optic Output
Fibre outputs with distal end collimation
- RS-7-4 Wafer Probe
Directly replaces lamp-based systems
- RS-7-5 Baffle Output
150 mm output with user adjustable f/number
- RS-7-6 Wide Field of View
75 mm output port with up to 180° field of view
- RS-7-7 Light Booth
CRI experimentation, analysis & optimisation
900 to 1700 nm spectral range
With the UK’s record breaking hot weather continuing, we thought you might like to know that Lake Shore Cryotronics offer four types of sensor for temperature measurement:
A diode temperature sensor is the general name for a class of semiconductor temperature sensors. They are based on the temperature dependence of the forward voltage drop across a p-n junction. The voltage change with temperature depends on the material. The most common is Silicon, but Gallium Arsenide (GaAs) and Gallium Aluminium Arsenide (GaAlAs) are also used.
These sensors are based on the change of resistance with temperature, and can be classified as positive temperature coefficient (PTC) or negative temperature coefficient (NTC). Platinum RTDs are the best example of PTC resistance sensors.
Capacitors are also used for low temperatures, but usually not for temperature measurement. Capacitance temperature sensors have the advantage of being insensitive to magnetic fields, but they commonly experience calibration shifts after thermal cycling.
Thermocouples are only useful where differential temperature measurements or low mass are the main consideration. They must be calibrated in-situ as the entire length of the wire contributes to the output voltage if it traverses a temperature gradient.
Each type sensor has its own particular advantages in terms of temperature range and response, as well as design features and drawbacks, so Elliot Scientific recommends contacting us to discuss your application and its requirements.
Lake Shore also do some nice instruments to go with their sensors!
The July issue of Laser Focus World magazine uses a photo of a YLF:Yb crystal mounted between two top-adjustable Siskiyou IXF monolithic tip/tilt flexure mounts to illustrate their feature story on an all-solid-state optical cryocooler developed by the Los Alamos National Laboratory and the University of New Mexico.
Solid-state optical refrigeration uses anti-Stokes fluorescence to cool macroscopic objects to cryogenic temperatures without the annoying vibrations typically introduced by mechanical cryocooling systems.
The crystal was excited by a low power linearly-polarised continuous-wave fibre laser by IPG Photonics, while the temperature was monitored with a calibrated DT-670-SD silicon diode from Lake Shore Cryotronics.
Coupling the laser light to the crystal was achieved by using an astigmatic Herriott cell, with the optics held in vacuum compatible Siskiyou IXF flexure mounts… known for their excellent mechanical and thermal properties.
Researchers in the UK or Ireland wishing to replicate this experiment can contact us for research lasers from IPG Photonics, sensors and instrumentation from Lake Shore Cryotronics, and the full range of mounts and stages from Siskiyou. Elliot Scientific can also be approached to supply optics and custom machined parts as well.
The full paper describing the experiment can be read here on nature.com.