Unformatted text preview: nsitivity in the ultraviolet spectral range.
Silicone avalanche diodes are based on the avalanche effect in barrier layer
semiconductors. They operate at a high reverse voltage and are suitable for the
detection of very small light output with reduced reaction times.
A typical characteristic curve of spectral sensitivity within a silicone photodiode is
shown in Fig. 11.4.6. One important property is the maximum value of spectral
sensitivity, which for silicone photodiodes can range between approx. 600 nm and
1000 nm, depending on type. 100
50 R / Rmax 40
400 500 600 700 800 nm 1000 wavelength Fig. 11.4.6: Relative spectral sensitivity R/Rmax of a silicon photodiode 192 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals The sensitivity of silicone photodiodes in the spectral maximum is typically at
0.5 A/W, i.e. at a received light emission power of 1 mW for instance, a photocurrent
of 0.5 mA is created.
Responsivity R of a photodiode is the quotient of the photocurrent I and the optical
radiant power P, which impinges on the photodiode:
P 11.4.5 Fibre-optic cables
Fibre-optic cables (glass or plastic fibre cables) are us...
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- Spring '12
- pH, proximity sensors, Festo Didactic GmbH, Festo Didactic GmbH & Co