Abstract
The spectrometer uses an array of 50 pyroelectric detectors etched from a PVF2 sheet in the precise positions for the various lines in the P and R branches of the CO2 spectrum. The detectors are accessed in sequence to give a bar chart display of the spectrum. Compared to the conventional spectrum analyser (using a phosphor screen for CW or a graphite screen for pulsed lasers) the instrument gives a substantial advantage in sensitivity with a noise equivalent power of 100 mu W for CW or 200 nJ for pulsed. The dynamic range is 3000:1, enabling the detection of weak satellite lines, while a digital store allows monitoring of each shot of an inconsistent but low repetition rate laser.
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