| 摘要 |
<p>PURPOSE:To make it possible to simultaneously measure a basis wt. or a thickness, moisture and hue with high accuracy, by providing three filters for transmitting three measuring wavelengths and performing operation by three measuring wavelength components. CONSTITUTION:A filter 51 for transmitting a first measuring wavelength lambda1 absorbing no moisture, a filter 52 for transmitting a second measuring wavelength lambda2 absorbing moisture and filters 53, 54 for transmitting the third measuring wavelength lambda3 of a visible light region are mounted and a rotary sector 5 rotated by a motor M is provided. The light of a light source 1 is projected to an object 3 to be measured through a projection lens 2 and transmitted light or reflected light thereof enters a detection element 6 through a condensing lens and the rotarly sector 5 and first, second and third signals e1, e2, e3 corresponding to the components of first, second and third measuring wavelengths lambda1, lambda2, lambda3 being the outputs of said detection elements 6 enter sampling hold circuits 81, 82, 83 and, subsequently, the basis wt. or thickness, moisture and hue of the object 1 to be measured are measured from the signals e1, e2, e3 by dividers 91, 92.</p> |
