The purpose of a collimator tube is to _____.

The purpose of a collimator tube is to reject unwanted light and guide infrared (IR) light onto the detector. Collimators are optical devices that help focus light rays into parallel beams, which enhances the clarity and precision of the signals being measured or detected. In the context of optical and infrared systems, the collimator effectively filters out ambient or stray light that could introduce noise and interfere with the desired signal, allowing only the relevant IR wavelengths to reach the detector. This is crucial in applications such as spectroscopy, where accurate readings depend on the integrity of the light being analyzed. By ensuring that only the specific light of interest is directed to the detector, the collimator significantly improves the performance and accuracy of the optical system.