Perkin-Elmer Lambda 950: Measurements of solar spectral transmittance and reflectance are made with highly automated instruments. Our most modern UV-VIS-NIR spectrophotometer is the Perkin-Elmer Lambda 950. Two earlier instruments in that series, a Lambda 19 and a Lambda 9, are also still in use in our lab dedicated to special purposes such as electrochromic measurement..

Spectrophotometer attachments: In addition to the base instruments, we also have a number of attachment modules each of which performs a specialized type of measurement. Each of the base spectrometers is equipped with a direct detection module as well as an integrating sphere detection module. Other accessories can perform  specular transmittance and specular reflectance at variable angles of incidence.

Angle Tubes: A collection of inserts made in our shop allow measurement at different angles of incidence. Each tube is attached to the faceplate on the outside of the sphere with small magnets. The tube can be rotated to test the sensitivity of the placement with respect to the detectors. The tubes are white on the outside and black on the inside. The capabilities of the instrument are thus extended with only minor and easily reversible modifications. A document detailing the angle tubes designed and built at LBNL can be found in the files section below.

Jacob Jonsson,
Oct 20, 2014, 10:03 AM