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Thermoreflectance imaging is used to obtain 2D temperature maps of encapsulated LED arrays and elements with sub-micron spatial resolution. Typical LED encapsulation is opaque for infrared light, which prevents direct measurement of the semiconductor die with infrared cameras and thermocouples. A lock-in transient imaging technique with a megapixel silicon CCD is used to obtain the thermoreflectance...
Although thermal infrared (TIR) imaging technology has been successfully applied in the thermographic inspection of engineering defects and landmines, its use for detecting water permeation on field large-scale rock relics is new. Huashan Rock Painting, a world-famous field large-scale rock relic in Guangxi Province, China, was used as a case for TIR imaging detection of water permeation on field...
This paper presents the design, fabrication, and characterization of temperature sensitive quartz resonators fabricated using heterogeneous integration methods for realizing high-density, thermal conductance fluctuation limited thermal sensors for infrared imaging and biochemical sensing applications. An integrated quartz sensor array using CMOS-compatible micromachining techniques has been designed...
Pressure drop and heat transfer characteristics of different dimple vortex generators arrangement are examined in this study. A total of five heat sinks were made and tested, including plain fin, dimple, two-group dimple, oblique dimple gap 4-12 fin, oblique dimple gap 6-12 fin. The tested results indicate that the pressure drop for dimple fin geometry is significantly higher than other fin types,...
Calorimetric method has for a long time been applied for energy conversion efficiency measurement in electrical machines. The number of temperature sensors necessary for its successful application in the field constitutes in one of the major drawbacks of the method. The present paper shows how the usage of infrared (IR) thermal imaging techniques can reduce costs and the necessary time for the calorimetric...
An infrared (IR) thermography measurement setup to capture the temperature distribution and power dissipation of the device under test is proposed in this paper. The system is based on a transparent oil heatsink which captures the thermal profile and run-time power dissipation from the device under test with a very fine degree of granularity. The proposed setup is used to perform the thermal analysis...
There are some defects on measuring equipment surface temperature directly by the use of the infrared thermograph technology to judge the status of the heat equipment, mainly including the great effect of the background temperature on the measured value which is difficult to be eliminated accurately. However, the temperature change rate of the heat equipment can be considered as the criterion of the...
As circuit density increases and high-power applications are facilitated, thermal considerations become paramount a design concern. In this paper, a high power monolithic microwave integrated circuit (MMIC) is modeled by the fREEDA multi-physics simulator and measured for validation. While validation is the crux of any simulation model, it is known that thermal measurements accurate to a high resolution...
Based on the geometrical characteristics of the female breast tissue, a bioheat transfer model is setup to study the surface temperature expression of the breast with a malignant tumor. Resort to the finite element analysis, effects of geometrical parameters of the tumor (the location and the size) and thermal diagnosis conditions (the environmental temperature and the convective heat transfer coefficient)...
Selective induction heating for wafer level bonding is presented. The purpose of this paper is to investigate the relationships between the geometry of solder loop and temperature distribution in induction heating. Using finite element method (FEM) and IR thermal imager, temperature distribution and variation are explored, which shows that the temperature on the solder loops is a function of the area...
We propose a novel concept of image converter from an infrared range into a visible range of electromagnetic waves by the use of waveguide resonator structures of a micron size as a sensitive element. The method is based on the modulation of the resonator proper equidistant spectrum under the influence of the external electromagnetic radiation of the infrared spectral range, which changes the optical...
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