TWI268340B - Method of valid measurement scopes for light sensors to increase the measuring distance practical distance of the light sensor from the measured body being determined to locate in the scope of between zero and the first distance - Google Patents

Abstract

This invention presents a method of valid measurement scopes for light sensors to increase the measuring distance. The valid measurement scopes of the previous light sensor are at the first distance and the second distance, and the second distance is larger than the first distance. This invention respectively acquires the electronic signals of the previous light sensors and at least an auxiliary light sensor for measuring distance; next the procedure of subtracting the electronic signal of the light sensor that is relatively farther to the measured body from the electronic signal of the light sensor that is relatively nearer to the measured body is performed. While the total amounts of the electronic-signal differences, which are larger than zero, of the light sensors and the auxiliary light sensors are larger than or equal to the total amounts of subtracting one from the total amounts of the light sensors and the auxiliary light sensors, the practical distance of the light sensor from the measured body is determined to locate in the scope of between zero and the first distance, and from the data bank to select a correct value to be as a measured result, furthermore to expand the valid measurement scope of the light sensors from zero to the second distance.