Noncontact and nondestructive measurements for determining flame temperature distribution are under investigation. This paper discribes a pilot study of ‘Infrared Rays Emission Computed Tomography (IRECT)’ to measure the temperature distribution in arbitrary transaxial layers of the flame by calculating the radiation intensity of infrared rays emitted from the flame as the projection data. We developed an experimental system using an infrared sensor device as the detector and applied our method to a laminar flame and succeeded in obtaining good images of the temperature distribution in the flame. Temperature profiles obtained by this method compaired satisfactorily with the results of thermocouple probe measurements.
This paper reports a new measuring method of velocity using a lenticular grating. The images of objects moving in a probing region are formed on the lenticular grating. The velocity of the objects is then determined from the velocity measurement of the moving images on the lenticular grating. The lenticular grating here, acts as a spatial filter. The preliminary experiment for measurements of velocity was performed by using a part of a random pattern on a rotating disk. The experimental results show that the present measuring method is useful for measurements of velocity.
Modified surface layers on the (111) Cd and (111) Te planes of the etched CdTe single crystals were investigated by the Auger electron spectroscopy method. On the surface etched by EAg-1, the surface modified layers are 10nm in thickness for the (111) Cd plane and 40nm for the (111) Te plane. On the surface etched by Br-methanol, these are 1nm and 2nm, respectively. On the other hand, the surface modified layer is thicker on the (111) Te plane than on the (111) Cd plane for a gas etching process.
The configuration and operational characteristics of a novel distributed feedback dye laser utilizing layers of small gel particles are investigated and discussed in this paper. The distributed feedback is provided by periodic corrugation of small OH-gel particles, the diameters of which are about 5 μm, placed on the bottom of the dye cell. Using Rhodamine 6G in methanol solution, output beam patern from the dye laser incorporating layers of OH-gel particles was effectively improved compared to the case without the layers. The lasing spectral width for this new structure laser is observed to be 0.63_??_0.85 nm. The considerably narrowed line width along with the improved beam pattern demonstrates the distributed feedbac effect caused by the layers of small gel particls in the dye cell.