Automated spectrometer for pressure measurement using ruby fluorescence

Abstract
A scanning fluorescence spectrophotometer intended for measurement of the ruby R1 lines in a high-pressure diamond anvil cell is described. A rigid framework supports the electronic and optical components and an XYZ translation stage to hold the pressure cell. Innovations include a digital monochromator scan controller, the automatic placement of tick marks on the recorder output at 0.1 nm intervals, and light detection with a photodiode. The unit is compact, weighs 50 kg, and requires only a chart recorder for operation as an automated high-pressure measurement station. These features allow easy shipment and reassembly at remote experimental sites.

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