An interferometry measure method on vibration spectrum of optical target based on cat-eye effect

• An interferometry measure method aiming at optical target based on cat-eye effect is proposed for the first time.
• The target with optical lens in complicated background can be found more easily by this method than by direct detection technique.
• The vibration spectrum of the target carried with optical lens can be measured conveniently.
• The optical target behind glass can be found much more easily by this method than by direct detection technique.
• This method is simple, effective, convenient for using, and has a high sensitivity of wavelength level to vibration amplitude.

In this paper, a simple method for measuring the vibration spectrum of optical target is proposed. It is performed by irradiating a laser beam on the optical window of the target and then making the cat-eye reflected light interfere with the reference incident light. The interference process and intension distribution are studied by using formula derivation and numerical computation. The experimental results are in agreement with the theoretic results. By using this method, we can get an interference intension time curve with higher contrast than the signal acquired by direct detection technique, so the optical target hidden in complicated background can be found much more easily and the vibration spectrum of the carrier with optical target can be acquired simply. Also this applied method is simple, effective, convenient for using, and has a high measure accuracy of one wavelength to vibration amplitude, as has been verified by a series of examples of simulated and experiment.