Dual Sandwich Detectors or Two Colour Detectors are mostly employed for remote temperature measurements. The temperature is measured by taking the ratio of radiation intensities of two adjacent wavelengths and comparing them with the standard black body radiation curves. The advantages of optical remote measurement have definitely made these devices the perfect match for this type of measurements. They are independent of emissivity and unaffected by contaminants in the field of view or moving targets. In addition, measurements of targets out of the direct line of sights and the ability to function from outside RF / EMI interference or vacuum areas are possible. They also have the advantages of overcoming obstructed target views, blockages from sight tubes, channels or screens, atmospheric smoke, steam, or dust, dirty windows as well as targets smaller than field of view and / or moving within the field of view. These detectors can also be used in applications where wide wavelength range of detection is needed.
OSI Optoelectronics offers three types of dual sandwich detectors. The Silicon-
Applications
- Pulse Detectors
- Optical Communications
- Bar Code Readers
- Optical Remote Control
- Medical Equipment
- High Speed Photometry
Two Colour Sandwich Detectors
Features
- Detector of choice for remote temperature measurement
- Detection principle:
- Ratio of radiation intensities from two adjacent wavelengths can be compared to standard black body radiation curve
- High Speed Response
- Low Capacitance
- Low Dark Current
- Wide Dynamic Range
- High Responsivity
