PASCO OS-8542 BLACK BODY LIGHT SOURCE User Manual
Page 7
012–07105B
Black Body Instruction Manual
3
Table 1: Prism Coefficients
Table 1 shows the values for the prism used. The graph in Figure 3
shows an inverse square fit of the data.
Thus, we get the values of A=13,900 and B=1.689
with the wavelength given by
Thus, the final equation for the wavelength (in nanometers) is
Determination of the Wavelength from the Angle (using DataStudio)
In DataStudio, the equation for determining the wavelength is listed in the Definition box in the Calculator
window, as follows:
Wavelength = filter (0,8000, (13900/(((1.1547*sin ((Init - Angle)/Ratio))^2 + 0.75)^0.5 - 1.689))^0.5)
where 0,8000 is the filtering range for the infrared light (0-8000 nm)
13,900 is constant A, as described above.
1.689 is constant B, as described above.
1.1547 is
2
3
Init - is the initial angle reading measured during data collection
Angle - is the angle measured by the rotary motion sensor
Ratio - is the ratio of the disk radius to the pin radius
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Figure 3: Relationship between refraction index
and wavelength for light passing through a prism