Scanning type, radiant-energy responsive temperature measuring apparatus

A radiant-energy temperature measuring apparatus of a scanning type for measuring temperatures of an object, having a light-sensitive device including a linear array of a plurality of light-sensitive elements which are responsive to respective amounts of radiant energy produced at different points of said object and at different points of areas adjacent to and outside edges of said object arranged on a straight line corresponding to said linear array, said light-sensitive elements generating photoelectric signals corresponding to said respective amounts of radiant energy received from points of said object or from points of said areas adjacent to and outside the edges of said object, the apparatus further having means for determining a temperature of said object at a desired one of said different points thereof, based on the photoelectric signal generated by one of said plurality of light-sensitive elements which optically matches said desired one point of the object, said radiant-energy temperature measuring apparatus comprising:

• edge detecting means for detecting an edge of said object in correspondence to one of said elements, based on said photoelectric signals generated by said plurality of light-sensitive elements;
• and
• selector means for selecting said desired one of the different points of the object, by designating a number of the light-sensitive elements as counted from said one element corresponding to said detected edge of the object, to said one light-sensitive element which optically matches said desired one point, said selector means applying said photoelectric signal generated by said one light-sensitive element, to said temperature determining means.