Abstract
To obtain the dynamic surface of high-frequency vibrating mirrors (VMs), a novel method involving multi-field interference (MFI) pattern imaging on a single image is proposed in this paper. Using multiple reflections and refractions, the proposed method generates three interference patterns at the same time, which improves the traditional time-series methods where a single interference pattern can be obtained at one time. Experimental results show that a series of MFI patterns can be obtained on a single image, with the laser repetition frequency (LRF) ranging from 200 Hz to 10 Hz, and the frame rate of the camera at 10 Hz. Particularly if the LRF (10 Hz) is equal to the frame rate of image, crosstalk is avoided completely, which is particularly desirable in dynamic surface measurement. In summary, the MFI imaging method provides an effective way for VM dynamic surface measurement.
Highlights
High-frequency vibrating mirrors (VM) [1] are commonly utilized to suppress background light during small infrared target detection
Is fixed to the optical table, the phenomenon of multi-field interference (MFI) can be observed by fine-tuning the tilt adjustment mechanism (TDTAM) and the viewing screen placed at the out-of-focus position of f2
The advantage of the proposed method is that it can produce three interference patterns simultaneously, which can be used for dynamic surface shape produce three interference patterns simultaneously, which can be used for dynamic surface shape measurement while the VM is vibrating; the μshape[2] HR interferometer does not have this ability [51]
Summary
High-frequency vibrating mirrors (VM) [1] are commonly utilized to suppress background light during small infrared target detection. Compared with laser ranging and structured light methods, interference methods [17–31] are more suitable for dynamic measurements, due to the advantages of real-time performance and high accuracy. There are three ways to implement interference for surface shape measurements: fringe scanning [34]; multi-interferogram [35–46]; and single-interferogram [47] methods. Multi-interferogram methods acquire interferograms with different reference phase positions by moving a scanning mechanism Both fringe scanning and multi-interferogram methods require a scanning mechanism to obtain properly timed sequence images. For high-frequency VM dynamic surface shape measurements, multiple images obtained at different time points cannot be used for this purpose. A new type of spatial sequencing is introduced This allows us to avoid the time delay present in fringe scanning and multi-interferogram methods, which will be helpful in capturing the dynamic surface of VM
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
