Spectroscopic sensor for measuring omnidirectional area in two-dimensional plane

Abstract

This paper describes a spectroscopic sensor for measuring a wavelength of the light from objects in two-dimensional omnidirectional area. I developed the spectroscopic sensor, in which vertical slits, a horizontal slit, a cylindrical reflective grating, a projection cylinder, a hyperboloid mirror and a camera. The light from the objects enters the spectroscopic sensor though the vertical slits and the horizontal slit from the omnidirectional area in the two-dimensional plane. The entered light is dispersed by the cylindrical reflective grating in the sensor. The dispersed light is projected on the projection cylinder. The camera takes the dispered light image projected on the projection cylinder though the hyperboloid mirror. The wavelength of the light is estimated by positions of the dispersed light projected the projection cylinder on an image sensor of the camera. I made up a hardware of the sensor. I took actual light experimentally by using the developed sensor. I checked measuring accuracy of the sensor to evaluate the performance of the sensor. The results have shown the usefulness in the developed sensor for measuring the wavelength of the light from the omnidirectional area in the two-dimensional plane.