Summary
A miniature angle measuring system is described which uses 0.4 mg sense coils in a three-dimensional high-frequency magnetic field. Rotations of the sense-coil-winding axis can be recorded using three phase-sensitive rectifier/filters (lock-in-principle). Principles of operation and simplified evaluation methods are described in detail. The measuring system is applied to the analysis of wing movements in a stridulating cricket (Gryllus bimaculatus De Geer). The results show that in both the calling and the courtship song the tooth impact frequency is equal to the frequency of the acoustically produced sound. This excludes the possibility that the high frequency of courtship song is produced via excitation of a resonator by a higher harmonic component of the tooth impact frequency.
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Supported by a Stipendium of the Max-Planck-Gesellschaft. Part of the programme of the Schwerpunkt “Neurale Mechanismen des Verhaltens” (Hu 35/17) under the auspices of the Deutsche Forschungsgemeinschaft
I wish to thank Prof. Franz Huber for continuous encouragement and support of this work. Dipl. engs. Ta van Long and Ngyen van Hoa helped very much in building the measuring system. I thank Dipl. phys. H.U. Kleindienst for valuable discussions, and Drs. W. Zarnack and J. Bacon for carefully reading the manuscript.
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Koch, U.T. Analysis of cricket stridulation using miniature angle detectors. J. Comp. Physiol. 136, 247–256 (1980). https://doi.org/10.1007/BF00657540
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DOI: https://doi.org/10.1007/BF00657540