Self-generating h.f. carrier feedback anemometer

A measuring-circuit a.c.-carrier technique is described, in which a feedback measuring system is self-generating with respect to the carrier and involves neither phase-sensitive detector nor carrier modulator stages, so that relatively simple and reliable circuits can be designed. The technique is described in connection with its application to a hot-wire anemometer, circuit stability and optimum-design considerations being dealt with in detail, leading to the design of a simple practical circuit.