A nondispersive infrared sensor is a simple spectroscopic sensor often used as a gas detector. It is non-dispersive in the fact that no dispersive element is used to separate out the broadband light into a narrow spectrum suitable for gas sensing.

What is non dispersive wave?

waves on shallow water

much less than D, a wave travels over stationary water at a speed given by (138). Because their speed does not depend on wavelength, the waves are said to be nondispersive.

What does non dispersed mean?

: not exhibiting, relating to, or causing dispersion : not dispersive a nondispersive lens nondispersive X-rays.