I'm working with thermal infrared (IR) cameras to detect human thermal radiation. I notice I can easily distinguish non-human objects throughout the camera's field of view, though all are at same room temperature.
I assume this is due to reflection of thermal IR 'bouncing' around the room. Indeed, we observe our large white board to be an excellent thermal IR 'mirror.'
CONCERN: Therefore, I'm concerned radiation reflection may affect frequency of thermal IR emanating from a human subject.
QUESTION: When thermal IR gets reflected from an object, does it change its wavelength (frequency) at all?