Applied Optics, no.52, p. 188-192 15-06-1983

Measurements of flow velocity in a microscopic region using a transmission grating

Ushizaka, T.; Asakura, T., Corporate Source: Res. Inst. of Appl. Electricity, Hokkaido Univ., Hokkaido, Japan

SUMMARY

This paper reports a method for measuring flow velocity in a microscopic region using a ransmission grating. The flow velocity is determined from the measurement of moving particle images on a transmission grating placed in front of a photodetector. These images, formed by a mlcroscoplc objective, correspond to particles moving In a flow. The method is used to measure the spatial distributions of the flow velocity in small glass tubes and to compare some of the results with comparable data obtained with differential laser Doppler velocimetry. The resultant distributions are compared with the theoretical flow distributions obtained using the flow rates through the tubes. The results demonstrate that the transmission grating method is usefull for measurements of the flow velocity in small probe volumes (11 refs.)

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