• Journal of the korean Society of Automotive Engineers
• /
• v.7 no.3
• /
• pp.94-101
• /
• 1985

The flame temperature of LPG-air premixture flame was measured by extrapolation of limiting case corresponding to the infinitely thin diameter of Platinum-resistance-hot-wire. LPG-air premixture flame, initially under atmospheric pressure and room temperature, propagates downward from top of the model combustion chamber maintained at constant pressure through the whole combustion process. Analytical calculation technique was also applied to determine full temperature history or spatial temperature distribution from flame reaction zone to burnt gas region.

• Proceedings of the Acoustical Society of Korea Conference
• /
• 1998.06e
• /
• pp.251-254
• /
• 1998

초음파 수신 신호의 공진주파수 변화를 이용한 온도 측정법에서 협대역 변환기를 사용한 초음파 온도측정이 가능함을 보여준다. 그리고 이를 위하여 공진주파수 변화와 온도변화간의 비례상수를 변화시켰다. 기존의 측정법은 온도변화와 기본주파수 변화와의 관계를 비례상수로 정의하였기 때문에, 최소한 3개 이상의 하모닉을 포함하는 광대역 변환기가 필요하였다. 하지만 협대역 변환기를 이용한 온도측정법에서는 비례상수를 주파수 변화비와 온도변화간의 관계로 나타내기 때문에 한 성분의 하모닉만을 측정하여도 온도측정이 가능하게 된다.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2007.04a
• /
• pp.111-113
• /
• 2007

Thermal conductivities of copper thin films on silicon wafer was obtained from temperature distribution on the surface of wafer measured by radiation thermometry, when sample was heated with constant temperature ate the both ends in a vacuum and dissipate heat by radiation heat transfer into an environment.

• Journal of Electrical Engineering and Technology
• /
• v.1 no.3
• /
• pp.387-395
• /
• 2006

A review on advanced flow visualization techniques is presented particularly for applications to micro scale heat and mass transport measurements. Challenges, development and applications of micro scale visualization techniques are discussed for the study of heating/evaporating thin films, a heated micro channel, and a thermopneumatic micro pump. The developed methods are (1) Molecular Tagging Fluorescence Velocimetry (MTFV) using 10-nm caged seeding molecules (2) Micro Particle Velocimetry (MPIV) and (3) Ratiometric Laser Induced Fluorescence (LIF) for micro-resolution thermometry. These three methods are totally non-intrusive techniques and would be useful to investigate the temperature and flow characteristics in MEMS. Each of these techniques is discussed in three-fold: (1) its operating principle and operation, (2) its application and measurement results, and (3) its future challenges.

• 한국연소학회:학술대회논문집
• /
• 2001.06a
• /
• pp.180-186
• /
• 2001

Spatially and temporally resolved gas temperature measurements have been made in aeroengine combustor sector rig burning standard kerosene fuel. Temperature PDFs have been obtained from a triple-sector double annular combustor rig running at simulated ground idle conditions, showing features of flow mixing within the burning rig. Mean temperature and temperature PDFs were measured by CARS to investigate flow characteristics of the recirculation zones.

• Transactions of the Korean Society of Machine Tool Engineers
• /
• v.16 no.5
• /
• pp.145-150
• /
• 2007

Optical communication according to request of technology of communications and optical fiber to be full filed faster communication and pass over transmission capacity limit per unit area, per unit hour appeared, and this optical fiber acts the biggest role to influence performance of optical communication network. Optical fiber(PMF Polarization Maintaining Fiber) is used, and is used by electric field measurement, self-discipline measurement, sensor(Sensor) Department by high definition measure such as thermometry and storehouse component that use because make broad sense status and polarized light information in passageway and union with storehouse integrated circuit etc. that use broad sense interference developing could transmit in state that keep transmitting broad sense plane of polarization is polarized light existence. Also, research is developed by optical fiber for Coherent communication recently.

• Radiation Oncology Journal
• /
• v.2 no.1
• /
• pp.21-23
• /
• 1984

Temperature homogeniety and stationary temperature is the most important thermometric considerations for the clinical use of hyperthermia. A thermal mapping was done in a phantom with thermocouple during hyperthermia which was induced by 1.0MHz,$0.7\~0.8watts/cm^2$ ultrasound and unfocused 2.5cm-diameter transducer. The results were as follows 1. Effective heating range$(42.5^{|circ}C\pm0.5^{\circ}C)$ were obtained 3cm in width and 4cm in depth from surface of phantom and temperature distribution was relatively uniform. 2. There was little heating effect more than 2cm away from transducer axis and more than 5cm in depth. 3. There was hot spots(more than $43^{\circ}C$) in $2.0\pm0.5cm$ depth from transducer along tranducer axis.

• Journal of ILASS-Korea
• /
• v.20 no.4
• /
• pp.230-235
• /
• 2015

The demands for reliable particle cloud temperature measurement exist in many process industries and scientific researches. Particle cloud temperature measurements depend on radiation thermometry at two or more color bands. In this study, we developed a sensitive, fast response and compact online infrared two-color probe to measure the temperature of a particle cloud in a phase of two field flow (solid-gas). The probe employs a detector contained two InGaAs photodiodes with different spectral responses in the same optical path, which allowed a compact probe design. The probe was designed to suit temperature measurements in harsh environments with the advantage of durability. The developed two-color probe is capable of detecting particle cloud temperature as low as $300^{\circ}C$, under dynamic conditions.

• International Journal of Air-Conditioning and Refrigeration
• /
• v.8 no.2
• /
• pp.11-22
• /
• 2000

Holographic interferometric tomography can provide reconstruction of instantaneous three-dimensional gross flow fields. The technique however confronts ill-posed reconstruction problems in practical applications. Experimental data are usually limited in projection and angular scanning when a field is captured instantaneously or under the obstruction of test models and test section enclosures. An algorithm, based on a series expansion method, has been developed to improve the reconstruction under the ill-posed conditions. A three-dimensional natural convection flow around two interacting isothermal cubes is experimentally investigated. The flow can provide a challenging reconstruction problem and lend itself to accurate numerical solution for comparison. The refractive index fields at two horizontal sections of the thermal plume with and without an opaque object are reconstructed at a limited view angle of 80$\circ$. The experimental reconstructions are then compared with those from numerical calculation and thermocouple thermometry. It confirms that the technique is applicable to reconstruction of reasonably complex, three-dimensional flow fields.

• Journal of Sensor Science and Technology
• /
• v.17 no.6
• /
• pp.429-436
• /
• 2008

A system is designed and fabricated for the automatic low temperature calibration by comparison of industrial resistance thermometers. The cryostat is suitable for the calibration of four capsule type thermometers and four long stem thermometers. By the automatic temperature control of the cryostat, we could calibrate thermometers from $-200^{\circ}C$ to $0^{\circ}C$ for ${\sim}15$ hours by one fill of liquid nitrogen in the test run of the system. The uncertainty of the calibration for industrial platinum resistance thermometers using the automatic system is about 30mK with a 95.% confidence interval.