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The Reference Transmittance Spectrophotometer (RTS) is the national reference instrument for regular spectral transmittance measurements of non-fluorescent samples at room temperature.
The illuminator has two sources, a deuterium (D2) arc lamp and a quartz-tungsten-halogen (QTH) incandescent lamp, a spherical mirror, a chopper, a prism-grating monochromator, a parabolic mirror, a polarizer, and an iris. A sample carriage moves the sample in and out of the influx beam. The receiver has a block for the efflux beam, a spherical mirror, and integrating sphere, and a detector, either a photomultiplier tube (PMT) or a silicon (Si) or extended indium-gallium-arsenic (InGaAs) photodiode.
Specifications / Capabilities:
Conditions for transmittance measurements using RTS.