Eppley Total Ultraviolet Radiometer (TUVR) The Eppley Total Ultraviolet Radiometer (TUVR) is a detector for the measurement of solar UVA radiation (0.295 to 0.385 µm). The instrument utilizes a hermetically sealed selenium barrier-layer cell that is protected by a quartz window. A specially designed teflon provides for a good cosine response. An encapsulated narrow band pass (interference) filter limits the spectral response of the photocell to the wavelength interval 0.295 to 0.385 µm. Specifications • Sensitivity: 150 µV/Wm-2. • Impedance: approx. 1500 Ohms. • Response Time: milliseconds. • Temperature Dependence: ±0.3% per °C over ambient temperature range -40 to +40°C. • Linearity: ±2% from 0 to 70 Wm-2. • Cosine Correction: ±3.5% from normalization 0-70° zenith angle. © 2022, UO Solar Radiation Monitoring Laboratory. Last revised: March 29, 2022. Top of page Site map Solar data Instruments Publications Home page Search About our data Software tools Sponsors Contact us Monitoring stations Educational material Home page URL: solardata.uoregon.edu