Abstract
In this article the capability of laser vibration sensors based on the frequency-phase method of distance measurement is considered. In such systems the frequency of output quantity is proportional to measuring distance. The vibrations of test object result in phase modulation of this quantity. The article deals with block diagram of frequency-phase vibration sensor. The main feature of device is the absence of reference channel in the circuit. In the proposed vibration sensor as in any frequency-phase distance-measuring system the evaluation of the frequency of its output signal by continuous step change of modulation frequency is made. In this case there is a slight frequency modulation of test signal caused by controlled object's vibrations. At the same time the adequate increment of phase shift through the vibrations is substantially smaller than a measuring phase shift. The expressions for cumulative phase shift considering the vibrations of test object and for output signal of the system are presented. The processing algorithm of output system signal and two reference quadrature voltages is proposed and enables to select the component from the output signal that is proportional to VB parameters. References 7, figures 2.
References
Braginets I.A., Kononenko A.G., Masiurenko Yu.A., Nizhenskii A.D. Laser meter of low frequency vibrations // Tekhnichna elektrodynamika. – 2006. – No 5. – P. 74–76. (Rus.)
Braginets I.A., Zaitsev E.A., Kononenko A.G., Masiurenko Yu.A., Nizhenskii A.D. Application of quasioptimal filtration in frequency-phase laser ranging system // Tekhnichna elektrodynamika. – 2010. – No 4. – P.54–58. (Rus.)
Dikson R.K. Spread spectrum systems: Translation from English / Edited by V.I.Zhuravlev. – Moscov: Sviaz, 1979. – 304 p. (Rus.)
Zaitsev E.A., Kononenko A.G., Masiurenko Yu.A., Nizhenskii A.D. A laser fiberscope of gaps in hydrogenerators // Tekhnichna elektrodynamika. – 2008. – No 2. – P. 51–58. (Rus.)
Zaitsev E.A., Kononenko A.G., Masiurenko Yu.A., Nizhenskii A.D., Latenko V.I., Ornatskii I.A. Special features of a phase-frequency method application in a laser ranging // Tekhnichna elektrodynamika. – 2008. – No 6. – P. 65–70. (Rus.)
Zaitsev E.A., Kononenko A.G., Masiurenko Yu.A., Nizhenskii A.D., Latenko V.I., Ornatskii I.A. Specific errors of phase-frequency laser distance meters // Tekhnichna elektrodynamika. – 2009. –No 3. – P. 50–54. (Rus.)
Kuts Yu.V., Shcherbak L.M. The statistical phase meter. – Ternopil, 2009. – 383 p. (Ukr.)
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright (c) 2023 Array