In recent years, the snapshot multi-dimensional imaging technology is emerging and becomes an increasing research focus. Especially, the spatial, spectral and depth information of scenes is particularly useful in target detection, recognition, tracking, scene classification et al. This paper proposes a snapshot compressed light field imaging spectrometer based on compressed sensing with light field concept and a snapshot depth-spectral imaging architecture based on image mapping and light field to realize the capture of depth-spectral information simultaneously. Through simulations, we demonstrate that the proposed snapshot depth–spectral imaging systems are effective to measure the depth-spectral information of scenes in a single snapshot time.
This paper introduces the optical design method of an IMS prototype and proposes an entire optical system optimization approach. The final performance evaluation reveals that the optimized system could meet the requirements. The spectral range of the prototype is designed to be from 450 nm to 700 nm, containing 31 bands. The spectral resolution at the central wavelength is about 8 nm. The field angle (2ω) is 1.86 deg, and the spatial angle resolution (ωΔ) is designed to be 0.013 deg.
We investigate the three-beam conjugate enhanced micro-vibration detection system. We introduce a conjugate light to the classical dual-beam heterodyne laser vibrometer to generate the three-beam interference. Detection of the micro-vibration signal is then enhanced by matching the power and phase of conjugate light and measured light. We also present the basic principle of three-beam conjugate enhanced micro-vibration detection and the conjugate enhancement conditions. Moreover, the expressions of micro-vibration signal amplitude amplification and resolution enhancement are derived and compared with the demodulation amplitude and limited resolution of classical dual-beam laser vibrometer. Experiments and numerical results further verify the amplitude amplification and resolution enhancement of the three-beam conjugate enhanced micro-vibration system. The archived results indicate that this system is especially suitable for the high-resolution detection of weak vibration targets, e.g., micro-nano structures.
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