The evaporograph used for detection of far infrared radiation is described. The theoretical limitation of the sensitivity of this instrument is estimated. The radiation energy of 5×10-5watt/cmcm2 is detected and the spatial resolution of 3lines/mm is obtained. The mode pattern ot HCN laser is observed by this method.
A delayed coincidence spectrometer is usually used for the spectroscopy of scattered light by which highly polymerized molecules can be analyzed. However, the spectrometer has some difficult probrems. In the difficult problems of the delayed coincidence spectrometer, two points are taken up and investigated. One is the counting loss of the delay line and an other is the error of delayed coincidence measurements at a long delay time. The counting loss is decreased by employing a multichannelized delay line system, while the error of the delayed coincidence rate at the long delay time is eliminated by using an intensity measuring method.
A plane grating is projected onto an object to be measured by an imaging lens. The object is viewed at an angle different from the projection direction through an identical grating placed in the image plane of the object. If the lines of the two gratings are parallel to each other, a moire contour map of the object is obtained. The two grating systems may be slightly different from each other. By adjusting the line spacing and orientation of a grating to the other one, the shape of the moiré fringes may be changed for the convenience of measurement. The fringe pattern is considered as a contour map of height variations measured from a base plane which can be effectively tilted by the above adjustments. The principle and experimental results are described in detail.