Measurements of the species concentration in flow field with the technique of spontaneous Raman imaging(II)
A spontaneous Raman imaging system which can monitor the concentrations of major species in flow field in real time is described. The results of the low pressure O 2 are presented and the lowest pressure we measured is 133Pa. This technique can be calibrated in real time by an introduction of a known amount of N 2. The error is less than 8%. The measurement precision of O 2(a 1Δ) concentration will be improved largely when this technique is applied to monitor chemical oxygen-iodine laser singlet oxygen generator performance.