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Unformatted text preview: ECE594I, Prof. Brown, Fall Quarter 2009 1 THz Sensitivity Characterization of a LiTaO 3 Pyroelectric Detector Write-Up Questions for Laboratory Project (due by 5:00 PM local time, Thursday 10 December 2009) A Water Grey Bodies in NE ∆ T Set-Up 1. In class we discussed the Debye Model for the dielectric function of water and mentioned that the “double Debye” is significantly more accurate than the “single Debye” at frequencies approaching 1 THz and above. Write a short script using Excel, MATLAB, or the numerical tool of your choice to compute the real and imaginary parts of the dielectric function of pure water between 100 GHz and 10.0 THz. Plot these together and include in your write-up. 2. Use the results of 1 to estimate the reflection coefficient and emissivity of our grey bodies consisting of pure water in a low-density polyethylene (LDPE) wash bottle. Assume the dielectric function of LDPE is 2.3 + 0.0j, and apply Kirchoff’s radiation law on the two interfaces: air-to-LDPE, and LDPE-to-water. Assume the radiation is always at normal incidence to simplify the calculation. 3. Find the average emissivity between 0.1 and 3.0 THz, which is roughly the range of transmission of the black-polyethylene filter used to block the background infrared. B. Calculation of NE ∆ T 4. Use the results of 2 above to calculate the apparent brightness temperature of the two grey bodies used between 0.1 and 3.0 THz. bodies used between 0....
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This note was uploaded on 12/02/2009 for the course ECE 000 taught by Professor O during the Spring '09 term at UCSB.
- Spring '09