Abstract:In order to solve the problem that the current measurement method of rotational speed parameters is difficult for the physical leads and sensitive devices to survive reliably in high temperature and other harsh environments, a wireless passive rotational speed parameter measurement method is proposed, which can be applied to the special harsh environment. Based on electromagnetic mutual inductance coupling, the wireless sensing mechanism that the amplitude of the terminal voltage signal of the reading antenna decreases periodically with the rotational speed was discussed and analyzed, and the wireless passive LC sensor and the signal demodulation circuit were fabricated. A wireless passive speed testing and verification system was constructed, and the wireless speed testing method was verified. The theoretical and experimental results show that the method can realize the speed measurement. At the same time, because of the advantages of no lead, small volume and non-contact energy transmission, wireless passive rotational speed parameters measurement method provides a reliable solution for the measurement of rotational speed parameters in high temperature and high rotation environment.