Abstract
Modulated reference wave holography is applied to the detection of small amplitude vibrations which are hardly observable by the normal time average or stroboscopic method. Small amplitude vibrations are detected as a slight intensity variation against the dark background of stationary regions on the reconstructed image. The sinusoidal, sawtooth and triangular phase modulation methods are theoretically considered and the detection sensitivities are compared with each other. The sensitivity is maximum in the case of the sinusoidal phase modulation if the relative phase between vibration and modulation is zero. Vibration amplitude as small as 0.012 times the wavelength of light can be detected. An experiment using the sinusoidal phase modulation has been performed and satisfactory results are obtained.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
