Intensified photodiode array resolution

We employ method B to study effects of this type. In this mode, our apparatus yields relative high-resolution fluorescence spectra at different time windows after excitation of the sample by the 355 nm pulse. The spectra are acquired by the upconversion method. The upconverted fluorescence spectrum is recorded simultaneously at all monitored wavelengths by an optical multichannel analyzer. It is constructed from a poly-chromator (HR320 Instruments SA) and an intensified silicon photodiode array detector (Princeton Applied Research Model 1412). The detector is interfaced to our Cromemco computer. 

This paper will concentrate on the unique requirements of aeronomic spectroscopy and on the application of image devices to these measurements. Spectrometer 1, Table I, was developed for rocket experiments intended to measure the NIR absorption spectra of 1 0 and 02 molecules in the middle atmosphere. A photodiode array was used as the spectrometric sensor. With this spectrometer we were able to measure the NIR solar radiation spectrum with an altitude resolution better than 2 km. Spectrometer 2, Table I, was basically of the same design as spectrometer 1, except that an image intensifier was optically coupled to the diode array to permit low light-level measurements. The resolution of this spectrometer was adequate for measurements of rotational profiles of the A-band absorption spectra of 02 molecules. We were able to measure the rotational temperature of oxygen molecules, in the stratosphere and the lower mesosphere with an accuracy of + 1.5°, and a spatial resolution better than 2 km. These experiments provided the basis for study of the dynamic processes of atmospheric molecules. Spectrometer 3,... 

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