Detection of the IR, visible, and UV spectra using arc lamp.

Detection of the IR, visible, and UV spectra using arc lamp. Collimated white light is sent through an adjustable slit and then through the edge of an equilateral quartz prism. The light is refracted, and the spectrum is focused on a Slit Thermopile which is mounted on an arm that can swing. The signal from the thermopile is sent to a D.C. amplifier and then to a projection milliammeter. When the thermopile is moved through the spectrum, the region of greatest heating is indicated well beyond the visible red portion of the spectrum, or the infrared. The infrared region of the spectrum can be rendered visible using a Sunstone IR fluorescent strip. The ultraviolet region can be detected with a Leybold zinc sulfide UV phosphorescent screen.