Abstract
The directional flow characteristics of pyroelectric anemometers, fabricated using z-cut LiTaO 3 plates, are studied. The heater resistor and the two sensor electrodes were evaporated NiCr films. The ratios of the lengths of the charge-sensing electrodes to the electrode—heater separation distance, β, were 32 and 54. The flow-angle dependence of the differential pyroelectric response was measured. The results yield a cos 1 2 α flow-angle dependence, where α is the fluid flow angle normal to the electrode length. Because of the large value of β, this angular dependence is in close agreement with the empirical formula often used for the hot wire anemometer.
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