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Unformatted text preview: Physics 3330 Prelab 6 solutions 1. One can find the sensitivity of the photodiode by using the equation in the lab man- ual S λ = R 940 nm RSR ( λ ). This equation simply states that the sensitivity at a wavelength λ is the sensitivity at λ = 940 nm multiplied by the relative spectral sensitivity at a wave- length λ : RSR ( λ ). The relative spectral sensitivity is a unitless quantity which is less than or equal to one since the sensitivity is highest at 940 nm. A graph of RSR ( λ ) versus λ is found in Figure 2 of the PD204-6C photodiode datasheet, available on the website or at http://www.colorado.edu/physics/phys3330/phys3330 fa09/pdfdocs/PD204-6C.pdf . To find the sensitivity for the fluorescent lights in lab we need to make an assumption about the average wavelength of the flourescent lights. Since visible light ranges from around 400 nm to 700 nm, one may take the mean of 550 nm as a reasonable average. At this wavelength, Fig. 2 of the photodiode datasheet indicates that RSR (550 nm) ≈ . 7. The sensitivity of the photodiode is given by how much current is produced for a given light intensity. Remember that the photodiode is operated in a reverse biased configuration so the appropriate quantity from the data sheet is the Reverse Light Current which indicates that 15 μ A of current is generated from light with an intensity of 5 mW/cm...
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This note was uploaded on 11/10/2009 for the course PHYS 33 at Colorado.