These results suggest that Liquigel and Celluvisc alter the tear layer and affect contrast sensitivity. The results agree with patient observations that Celluvisc causes a moderate amount of blur that gradually subsides. In such patients, the shorter duration of blur with Liquigel (about half that of Celluvisc) may be more acceptable. The technique of blending various viscosity CMC materials while maintaining the total CMC concentration of 1.0% may be beneficial in dry eye therapy without causing excessive blur to patients.
Details of the fabrication process and figures of merit of resistive YBaCuO micro bolometers are reported. Thin films of YBaCuO were prepared on Si wafers under conditions that promote formation of the semiconducting phase at room temperatures. Effects of the preparation conditions on activation energy of YBaCuO were studied to obtain films with a large temperature coefficient of resistance (TCR). TCR with values of up to 0.04 K-' was achieved uniformly on 10-cm wide wafer areas. Bulk micromachining was used to create 60 x 60 Iim2 bolometers on Si3N4 bridges with a thermal conductance of 7.6x 10 W I K. The low frequency responsivity and detectivity of the micro bolometers were respectively 7 x 10 V I W and 3 x 10 cm.Hz112 / W at room temperatures. These figures compare favorably with figures of other classes of uncooled micro bolometer and are consistent with those derived from thermal properties of the bridge. Under normal operating conditions and assuming f I 1.0 optics, the NETD of focal planes that make use of these micro bolometers was estimated to be less than 50 mK in the spectral range of 8 to 14 Im.
PbBiSrCaCuO films with a predominant Bi2Sr2Ca2Cu3O10 superconducting phase were prepared on (100) MgO and LaAIO3 substrates. The radiative properties of the film-substrate composites were investigated at room temperature and at temperatures near 7 in the wavelength band of 2-17 pm. For the film parameters used in this experiment, the near normal-incidence values of the reflectance were large while those of the transmittance were very small. No significant change in reflectance was observed as the film underwent a superconducting-normal transition in the vicinity of 7. However, the reflectance decreased with decreasing film thickness and radiation wavelength. It could be verified that the substrate has a negligible effect on overall radiative properties when film thickness is sufficiently large. To determine the response mode of the film at infrared wavelengths, photoresponses to short laser pulses were measured. From the temperaturedependent behavior of transient structure and responsivity, the thermal origin of the photoresponse could be confirmed.
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