Depth profiling of thermal relaxation time and thermal conductivity related to hyperbolic heating propagation

2001 ◽  
Vol 73 (2) ◽  
pp. 193-198
Author(s):  
Y.K. Lu ◽  
Q.B. Zhou ◽  
S.Y. Zhang
Keyword(s):  
Thermal Conductivity ◽  
Relaxation Time ◽  
Depth Profiling ◽  
Thermal Relaxation ◽  
Thermal Relaxation Time

scholarly journals Применение неохлаждаемых микроболометров для регистрации импульсного терагерцового и инфракрасного излучения

2022 ◽  
Vol 92 (3) ◽  
pp. 443
Author(s):  
М.А. Демьяненко ◽  
В.В. Старцев
Keyword(s):  
Thermal Conductivity ◽  
Relaxation Time ◽  
Terahertz Radiation ◽  
Continuous Wave ◽  
Thermal Relaxation ◽  
Temperature Response ◽  
Thermal Relaxation Time ◽  
Frame Rate ◽  
Wave Radiation ◽  
Analytical Relations

Analytical relations for temperature response of the bolometer to periodic radiation pulses are obtained. It is theoretically shown and experimentally confirmed by the example of infrared bolometers that when detecting short radiation pulses, in contrast to the case of constant radiation, increasing the thermal conductivity of the bolometer and, accordingly, decreasing its thermal relaxation time, it is possible to significantly increase the response rate of the receiver, practically without reducing its sensitivity. The possibility of effective registration of pulsed terahertz radiation by microbolometers with a resistively coupled, thermally non-isolated antenna is considered. It is shown that such bolometers, which have increased thermal conductivity and, accordingly, reduced sensitivity to continuous-wave radiation, can be highly effective when detecting pulsed radiation with a duration shorter than the thermal relaxation time of the bolometer. On their basis, uncooled matrix detectors of pulsed terahertz radiation, characterized by a minimum detectable energy of less than 110-12 J and a frame rate of up to 1000 Hz, can be developed.

On measurement of the thermal relaxation time in transient thermal processes of solids

2015 ◽  
Vol 58 (3) ◽  
pp. 251-257 ◽  
Author(s):  
Yu. A. Kirsanov ◽  
A. Yu. Kirsanov ◽  
K. Kh. Gil’fanov ◽  
A. E. Yudakhin
Keyword(s):  
Relaxation Time ◽  
Thermal Relaxation ◽  
Thermal Relaxation Time ◽  
Thermal Processes ◽  
Transient Thermal

Elastic and Ultrasonic Studies on RM (R = Tb, Dy, Ho, Er, Tm; M = Zn, Cu) Compounds

2019 ◽  
Vol 74 (12) ◽  
pp. 1123-1130
Author(s):  
Chandreshvar Prasad Yadav ◽  
Dharmendra Kumar Pandey ◽  
Devraj Singh
Keyword(s):  
Thermal Conductivity ◽  
Wave Propagation ◽  
Relaxation Time ◽  
Elastic Moduli ◽  
Potential Model ◽  
Thermal Relaxation ◽  
Ultrasonic Velocities ◽  
Nearest Neighbours ◽  
Thermo Physical Properties ◽  
Model Approach

AbstractThe present article comprises computation of elastic, ultrasonic, and thermo-physical properties of RM (R = Tb, Dy, Ho, Er, Tm; M = Zn, Cu) compounds at 300 K. The second-order elastic constants (SOECs) and elastic moduli are evaluated initially, using potential model approach considering interaction up to second nearest neighbours. The ultrasonic velocities are obtained for wave propagation along <100>, <110>, and <111> crystallographic directions using evaluated SOECs. The Debye temperature, specific heat at constant volume, thermal energy density, thermal conductivity, and thermal relaxation time are also calculated. The obtained results are compared and analysed for justification and application of materials.

Thermal Relaxation Time of Crystal in Pulsed Laser Diode End-Pumped Solid-State Laser

2008 ◽  
Vol 35 (8) ◽  
pp. 1132-1138 ◽  
Author(s):  
宋小鹿 Song Xiaolu ◽  
过振 Guo Zhen ◽  
李兵斌 Li Bingbin ◽  
王石语 Wang Shiyu ◽  
蔡德芳 Cai Defang ◽  
...  
Keyword(s):  
Relaxation Time ◽  
Solid State ◽  
Laser Diode ◽  
Thermal Relaxation ◽  
Pulsed Laser ◽  
Solid State Laser ◽  
Thermal Relaxation Time ◽  
State Laser
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