COMMENT

摘要

Condition monitoring has primarily been the realm of embedded electronic sensors and external probes attached to the structure of interest. Most optical solutions, however, are non-contact and use the properties of light in order to provide sensory information of the area of interest. The wavelength range tends to be from UV through the visible spectrum (400 nm - 700 nm), through short wave infrared (SWIR), near infrared (NIR), mid infrared (MIR), far infrared (FIR) and beyond, falling short of terahertz radiation and microwaves. CM solutions are being developed using every part of the spectrum.