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Experimental systems for evaluating the potential of wavelength modulated NIRS using (a) a SC laser and AOTF and (b) two laser diodes. The dashed line represents the light path, either via optical fibers or free space. [SC, supercontinuum; AOTF, acousto-optic tunable filter; IM, intensity modulator; PD, photodiode detector; LIA, lock-in amplifier; Freq. 1 and Freq. 2 generate reference signals at different frequencies, and drive the (a) AOTF and IM, and the LDs and the optical switch].
