Patent ID: 7381955
Filing Date: 2008-06-03
Classification: G01N

Abstract:
1. A method of inspecting a target by tera-hertz wave spectroscopic measurement, comprising: a spectroscopic measurement step of pre-measuring a first spectrum matrix [S] of tera-hertz wave absorbencies of a target component for a plurality of frequencies ranging from about 1 THz to 3 THz; an object spectroscopic step of irradiating an object with tera-hertz waves of the plurality of frequencies to measure absorbencies of the object; determining presence or absence of the target component in the object on the basis of the first spectrum matrix [S] of tera-hertz wave absorbencies and a second spectrum matrix [I] of tera-hertz wave absorbencies of the object; and a density calculation step of calculating a target density [P] on the basis of the first spectrum matrix [S] of tera-hertz wave absorbencies and the second spectrum matrix [I] of tera-hertz wave absorbencies of the object.