Abstract
In infrared weak target detection systems, high-frequency vibrating mirrors (VMs) are a core component. The dynamic surface shape of the VM has a direct impact on imaging quality and the optical modulation effect, so its measurement is necessary but also very difficult. Measurement of the dynamic surface shape of VMs requires a transiently acquired image series, but traditional methods cannot perform this task, as, when the VM is vibrating at a frequency of 3033 Hz, using high-speed cameras to acquire the images would result in frame rates exceeding 1.34 MFPS, which is currently technically impossible. In this paper, we propose the long exposure short pulse synchronous phase lock (LSPL) method, which can capture the dynamic surface shape using a camera working at 10 FPS. In addition, our proposed approach uses a single laser pulse and can achieve the dynamic surface shape measurement on a single frame image.
Highlights
High-frequency vibrating mirrors (VMs) are commonly utilized to suppress background light during small infrared target detection
The interferometer was mounted on the surface shape of VM1 was not adjusted to its optimal shape
With VM1 at a standstill, we adjusted the two-dimensional tilt adjustment mechanism so that interference patterns were observable on the screen
Summary
High-frequency vibrating mirrors (VMs) are commonly utilized to suppress background light during small infrared target detection. The accurate measurement of the surface of the vibrating mirror is important. Three-dimensional (3D) surface measurements are divided into two main categories [1,2,3,4,5,6]: contact and non-contact methods. The main advantage of contact methods is that they can achieve micron-level accuracy. Their main disadvantages are that they damage the target’s surface they cannot be used to obtain subtle features of complex target surfaces, they are slow, and it is easy to wear the probe, which will degrade the measurement accuracy and shorten its service life. Non-contact methods do not require contact with the target, thereby avoiding surface damage
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