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Microheater

About: Microheater is a research topic. Over the lifetime, 814 publications have been published within this topic receiving 12478 citations.


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Proceedings ArticleDOI
20 May 2013
TL;DR: In this paper, the authors presented the results of experimental studies of the temperature dependence of a microfibre coupler (MFC) with a waist diameter of ~4 μm covered with a layer of liquid crystal (LC) material.
Abstract: The paper presents the results of experimental studies of the temperature dependence of a microfibre coupler (MFC) with a waist diameter of ~4 μm covered with a layer of liquid crystal (LC) material. The microfiber coupler is fabricated by fusing together and tapering of two standard telecom fibers using a microheater brushing technique, followed by partially embedding the structure in a low-refractive index UV curable polymer (Efiron PC-363) for stability and later by placing a thin heated LC layer over the polymer-free uniform taper waist region. The temperature dependence of the embedded in polymer MFC sensor before the application of the LC layer demonstrates a redshift of the coupler’s spectrum with an average sensitivity of ~0.5 nm/°C in the temperature range of 14-70 °C. The application of the LC overlay increases the average temperature sensitivity to ~0.7 nm/°C. The demonstrated device offers several advantages such as ease of fabrication and light coupling, the potential for better stability and the possibility of electric field tuning for realizing temperature, electric field, bio-, chemical sensors and tunable add-drop filters for fiber communication systems. Further work is ongoing to explore various tuning mechanisms of the MFC spectrum.

6 citations

Proceedings ArticleDOI
07 Aug 2002
TL;DR: In this article, a microprobe-based electrical and thermal recording technique for high-density data storage is proposed, where a microheater integrated at the free end of a thermal micro-probe is formed by diffusion of boron for 3 hours at 1160/spl deg/C and supported by two conductive silicon legs.
Abstract: In this paper, we propose microprobe-based electrical and thermal recording techniques for application to high-density data storage. A microheater integrated at the free end of a thermal microprobe is formed by diffusion of boron for 3 hrs at 1160/spl deg/C and is supported by two conductive silicon legs. When flowing a pulsed current through the legs, the heater is electrically heated in a short time. Primary experiments for electrical and thermal recording are evaluated using sol-gel processed PZT and AgInSbTe thin films as storage media. For electrical recording on the PZT film, a voltage pulse is applied between a conductive tip and the PZT film. The nano-sized ferroelectric domains are easily switched by the applied voltage. The smallest marks were below 100 nm in diameter, which correspond to bit densities over 70 Gb/in/sup 2/. For thermal recording on AgInSbTe, the conductive tip is Joule heated by flowing a current and then the heated tip undergoes a local phase change (amorphous to crystalline or crystalline to amorphous). To read the formed mark, we measure the electrical resistance between a bottom electrode of AgInSbTe and the conductive tip because the electrical resistance of the amorphous state is higher than that of the crystalline state.

6 citations

Journal ArticleDOI
Weiping Yan1, Ning Xue1, Xinghui Shi1, Junshan Liu1, Jihong Guo1 
TL;DR: In this paper, three kinds of membranes, Ni, Pt, and Ni-Cr, were fabricated on silicon substrates; their resistance-temperature characteristics and heating properties are discussed.
Abstract: The development of PCR chip shortens the reaction time of DNA amplification, reduces the bulk of reaction reagents; therefore, it is widely applied to biomedicine and other related fields. Since PCR reaction is completed through three different precise temperature zones periodically, the sensitivity of temperature measurement and the heating property of the metal membrane must be highly regarded. In this paper, three kinds of membranes, Ni, Pt, and Ni–Cr, were fabricated on silicon substrates; their resistance–temperature characteristics and heating properties are discussed. The results show that Ni and Pt films have good linear resistance–temperature relationship; the heating property of Pt film is superior to that of Ni–Cr film. The PCR chip with Pt film microheater can reach 150°C in a short time with 25 V voltage.

6 citations

Proceedings ArticleDOI
20 Jul 2003
TL;DR: The ultimate goal of the project is to design the sensor with minimum size and with maximum sensitivity providing minimum response time, which will allow determination of humidity variation in different generations of the human lung during a breath.
Abstract: The present project is aimed at developing a capacitive humidity microsensor to measure humidity profiles inside the human respiratory tract. The ultimate goal of the project is to design the sensor with minimum size and with maximum sensitivity providing minimum response time. The sensor will allow determination of humidity variation in different generations of the human lung during a breath. The design process involves an appropriate simulation of the sensor to investigate the influence of several parameters on its sensitivity, and to develop a microheater that would be used to thermally reset the sensor. This sensor consists of interdigitated electrodes formed as a capacitor using aluminum as conductor and polyimide as dielectric built on a silicon substrate. For the thermal resetting, a polysilicon microheater will be built just underneath the sensor. The system should have quick absorption of moisture and ideally have a response time of less than 1 s. This specific requirement would allow for several measurements during one breath period. In order to meet these constraints a capacitive sensor was designed with a dielectric sensitive to humidity. Other parameters such as shapes of air contact surfaces, domain dimensions, properties of materials, etc. are analyzed and results are shown as well.

6 citations

Journal ArticleDOI
TL;DR: Boiling heat transfer results with and without the electric field are presented andconsiderably greater heat transfer enhancement was measured than under similar conditions in +1 g.
Abstract: The effects of a nonuniform electric field on vapor bubble detachment and heat transfer in subcooled pool boiling from a microheater array are investigated. The heater array faced downward to simulate a -1 g gravity condition and to eliminate the dominant masking effect of the buoyancy force. Experiments were conducted at different subcooling levels for various wall temperatures and electric field magnitudes. A dielectric fluid, FC-72, was used as the working fluid at ambient pressure. The array of 3 x 3 independently controlled microheaters was maintained at constant temperature and the rate of heat transfer from each heater was measured. Bubble images were recorded using a high-speed camera. The electric field was applied between the horizontal downward-facing microheater array, which was grounded, and a spherical, off-axis electrode beneath it. Boiling heat transfer results with and without the electric field are presented in this study. In the absence of the nonuniform electric field, compared to the same bulk fluid temperature and wall superheat settings in the +1 g situation, a much larger primary bubble was formed on the heater array, due to the coalescence of the secondary bubbles that nucleated on the heater array. The vapor bubble remained on the heater array surface and no bubble detachment was observed. With the nonuniform electric field applied, bubbles were lifted and sheared off from the heater array surface. The electric field was able to break up the primary bubble into several smaller bubbles--considerably greater heat transfer enhancement was measured than under similar conditions in +1 g.

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202332
202275
202138
202053
201937
201852