磁歪遅延線を使用した変位変換器

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タイトル別名
  • Displacement Transducer Using Magnetostrictive Delay Line
  • ジワイ チエンセン オ シヨウシタ ヘンイ ヘンカンキ

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The displacement transducer described in this paper measures distance as a function of the propagation time of an acoustical pulse travelling from a transmitter past two detector sensors on a magnetostrictive delay line.<br>Displacements from a few micro meters to a few meters can be measured as analog quantities without any mechanical contact with the object.<br>Acoustical velocity is generally influenced by temperature, which makes it difficult to realize precise displacement measurements utilizing acoustical waves. To overcome this problem, the authors developed the displacement transducer described in the following paragraphs.<br>Two detector coils-one fixed on each end of a magnetostrictive delay line-detect acoustical waves which are transmitted by a moving coil installed between them. By measuring and computing the ratio of the propagation times from the moving coil to each detector, the displacement can be obtained.<br>In this way, the temperature characteristics of the transducer as well as the changes in electro-mechanical (transduction) efficiency of the delay line materials are compensated for and the common mode noise rejection is greatly improved.<br>This paper describes the basic principles, construction and characteristics of a displacement transducer built as a test model utilizing acoustical wave propagation. Instead of employing conventional slidewire potentiometers, this transducer was installed as a position feedback element in servo recorders owing to the transducer's simple contactless construction and high speed response. Thus, reliable servo recorders were realized by incorporating these contactless displacement transducers.<br>A unique wireless method was devised to supply current pulses to the movable transmitter coil by magnetic coupling.

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