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| group2:final_design_-_pre-build 2008/10/05 20:47 | group2:final_design_-_pre-build 2008/10/05 20:50 current | ||
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| The detector was chosen to be a Si photodiode, because it operates over the visible range. The chosen diode has an intensity peak in the middle of the spectrum, and so the software used for data analysis must account for this. It was mentioned in the previous section that the working distance for the detector will be approximately 10 cm. The detector will move linearly, and its path is shown by line A in Figure 1. | The detector was chosen to be a Si photodiode, because it operates over the visible range. The chosen diode has an intensity peak in the middle of the spectrum, and so the software used for data analysis must account for this. It was mentioned in the previous section that the working distance for the detector will be approximately 10 cm. The detector will move linearly, and its path is shown by line A in Figure 1. | ||
| The dashed curve in Figure 1 represents an equal intensity curve: at this curve, every wavelength has traveled the same distance, and therefore got attenuated by the same amount. It is evident that the path of the diode will see an uneven intensity curve as it scans the spectrum. However, the attenuation of light can be expressed mathematically, and accounted for by the software. The advantage of having the diode move linearly is the simplification of the mechanical design. As was mentioned previously, the detection of individual wavelengths relies on physical geometry, and so requires a precise physical set up. | The dashed curve in Figure 1 represents an equal intensity curve: at this curve, every wavelength has traveled the same distance, and therefore got attenuated by the same amount. It is evident that the path of the diode will see an uneven intensity curve as it scans the spectrum. However, the attenuation of light can be expressed mathematically, and accounted for by the software. The advantage of having the diode move linearly is the simplification of the mechanical design. As was mentioned previously, the detection of individual wavelengths relies on physical geometry, and so requires a precise physical set up. | ||
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| + | {{:group2:spectrometer_schematics_v01.jpg|}} | ||
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| + | Figure 1: Spectrometer Schematics | ||
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