A CT-type laser concentration meter for measuring 2-dimensional profile by solution of the inverse problem, has been proposed and developed (Hino, et al., 1997, 1998). In these papers, the ‘virtual-load’ method has been applied to solve a system of simultaneous linear equations (A-w=R), and then numerical simulation and laboratory experiments have confirmed the usefulness of the methodby using a stepping motor for scanning laser beams.
In this paper, optical scanning and signal processing systems are improved for a practical high-speed CT concentration meter, also based on the virtual-load method. A prototype of the meter, using laser light sheets of 12 emitter set and photodiode array of 12 receiver set without mechanical moving parts, is developed and confirmed to measure 2D concentration profiles in approximately real time (order of ms).