Optical frequency comb profilometry with a compressive sensing-based single-pixel camera composed of digital micromirror devices and a two-frequency method for meter-order depth measurements

We demonstrated optical-frequency-comb profilometry with a compressive sensing-based single-pixel camera composed of digital micromirror devices and a photodetector for measurement of large-depth objects. Use of two harmonic frequencies allowed us to measure an object with a meter-order depth without any 2 pi-phase ambiguity. Profilometry with 10 x 10 pixels using the 12th and 13th harmonics of the fundamental frequency of 76 MHz gave a noise level of similar to 10 mu m in terms of standard deviation. Linking the measurement results obtained using one and two frequencies gave an axial dynamic range of similar to 3.9 x 10(5). (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)