Two Color Sandwich Photodiodes

Dual Sandwich Detectors or Two Color 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 sight 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.

Image Datasheet Model Number Detector Element Active Area Spectral Range Peak Wavelength Responsivity Shunt Resistance Capacitance Rise Time Reverse Voltage Detectivity at Peak Package View
PDF PIN-DSIn Si (top) 2.54 mm² 400 - 1100 nm 950 nm 0.55 A/W 150 MΩ 450 pF 4 µs 5 V 1.2 x 1013 cm√Hz/W TO-5 View
InGaAs (Bottom) 1.50 mm² 1000 - 1800 nm 1300 nm 0.6 A/W 1 MΩ 300 pF 4 µs 2 V 8.4 x 1011 cm√Hz/W TO-5 View
PDF PIN-DSS Si (top) 2.54 mm² 400 - 1100 nm 950 nm 0.45 A/W § 500 MΩ 70 pF 10 µs 5 V 1.7 x 1013 cm√Hz/W TO-5 View
Si (bottom) 2.54 mm² 950 - 1100 nm 1060 nm 0.12 A/W 500 MΩ 70 pF 150 µs 5 V 4.7 x 1012 cm√Hz/W TO-5 View

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