Temperature Coefficient of Thin Film Resistance Temperature Detectors for Improved Heat Flux Sensors

2013 ◽  
Vol 378 ◽  
pp. 302-307 ◽  
Author(s):  
B. Azerou ◽  
B. Garnier ◽  
A. Lahmar
Keyword(s):  
Thin Film ◽  
Heat Flux ◽  
Temperature Coefficient ◽  
Flux Measurement ◽  
External Boundary ◽  
Heat Flux Sensor ◽  
Film Resistance ◽  
Heat Flux Sensors ◽  
The One ◽  
Flux Sensor

The measurement of thermal properties or internal or external boundary conditions requires temperature and heat flux data. Both information can be provided by heat flux sensors. The one consisting in measuring temperature at various locations within the wall and using inverse method to estimate wall temperature and heat flux is among those providing the lowest measurement bias for transient heat flux measurement. However, this very accurate sensor requires time consuming technical work for microthermocouples implementation and due to the welding, one cannot locate precisely the temperature measurement. The idea developed in this work is to replace the wire microthermocouples by thin film resistance temperature detectors deposited on polymer substrate in order to ease the fabrication and to increase the accuracy of heat flux sensor. As the deposited sensors are RTDs, a preliminary study is performed showing the effect of the metal as well as the processing conditions on the electrical resistivity and temperature coefficient of copper and aluminum thin film

Performance and Modeling of Heat Flux Sensors in Different Environments

1999 ◽  
Author(s):  
D. G. Holmberg ◽  
C. A. Womeldorf
Keyword(s):  
Heat Flux ◽  
Flux Measurement ◽  
Heat Flux Sensor ◽  
Environment Modeling ◽  
Sensor Performance ◽  
Heat Flux Sensors ◽  
Substrate Properties ◽  
Accuracy Of Measurement ◽  
Flux Calibration ◽  
Flux Sensor

Abstract Heat flux measurement is not simple; care is required in selecting a suitable sensor for a given application. Surface substrate properties and the convective and radiative environment determine the choice of sensors. Mounting of the sensor, especially in calibration versus application, influences accuracy of measurement. The purpose of the present study is to increase awareness of potential errors in heat flux sensor use. This paper compares sensor performance in general by examining results of testing three commercially available sensors and by numerical modeling of these sensors. Comparisons of sensor calibrations in the NIST convective heat flux calibration facility are made with manufacturer calibrations and give evidence of potential pitfalls when using a sensor in a different environment than the calibration environment. Modeling results help explain observed data, demonstrating specific sensor parameters that can lead to significantly different calibrations in different environments.

scholarly journals Novel portable device to analyze the moisture permeability of car seat

2018 ◽  
Vol 69 (03) ◽  
pp. 183-189
Author(s):  
MAZARI FUNDA BUYUK ◽  
MAZARI ADNAN ◽  
HAVELKA ANTONIN ◽  
GLOMBIKOVA VIERA
Keyword(s):  
Heat Flux ◽  
Pid Controller ◽  
Portable Device ◽  
Heat Flux Sensor ◽  
The Real ◽  
Car Seats ◽  
Car Seat ◽  
Testing Method ◽  
Heat Flux Sensors ◽  
Flux Sensor

The comfort performance of car seat is important factor while producing car seats, each layer of the car seat is tested separately on classical testing machines, which lacks the real car seat performance when all layers are sandwiched. The complication of car seat design and the testing method bring a great demand of portable device which can measure the comfort performance of the real car seat. In this research a novel portable device is designed which work with special heat flux sensor and the device is connected to computer by USB port and values of heat flux temperature of the water and temperature of the surface is provided by the software. Heat flux sensors measure the heat transfer through a surface, and are expressed in kw/m2. The software controls the heating plate adjustment using PID controller. The device is tested with real car seat and shows repeatable and reproducible results.

A Novel Ceramic-Based Heat Flux Sensor Applied for Harsh Heat Flux Measurement

2018 ◽  
Author(s):  
Wen Lyu ◽  
Yaohui Ji ◽  
Tong Zhang ◽  
Guanyu Liu ◽  
Jijun Xiong ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flux Measurement ◽  
Heat Flux Sensor ◽  
Heat Flux Measurement ◽  
Flux Sensor

A Hybrid Method for Measuring Heat Flux

2009 ◽  
Vol 132 (3) ◽  
Author(s):  
David O. Hubble ◽  
Tom E. Diller
Keyword(s):  
Heat Flux ◽  
Hybrid Method ◽  
Sensor Response ◽  
Time Response ◽  
Heat Flux Sensor ◽  
Response Accuracy ◽  
Temporal Response ◽  
Heat Flux Sensors ◽  
Flux Measurements ◽  
Flux Sensor

The development and evaluation of a novel hybrid method for obtaining heat flux measurements is presented. By combining the spatial and temporal temperature measurements of a heat flux sensor, the time response, accuracy, and versatility of the sensor is improved. Sensors utilizing the hybrid method are able to make heat flux measurements on both high and low conductivity materials. It is shown that changing the thermal conductivity of the backing material four orders of magnitude causes only an 11% change in sensor response. The hybrid method also increases the time response of heat flux sensors. The temporal response is shown to increase by up to a factor of 28 compared with a standard spatial sensor. The hybrid method is tested both numerically and experimentally on both high and low conductivity materials and demonstrates significant improvement compared with operating the sensor as a spatial or temporal sensor alone.

Cross-Verification of Thermal Characterization of a Microcooler

2007 ◽  
Vol 129 (2) ◽  
pp. 167-171 ◽  
Author(s):  
Zs. Kohári ◽  
Gy. Bognár ◽  
Gy. Horváth ◽  
A. Poppe ◽  
M. Rencz ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermal Characterization ◽  
Structure Functions ◽  
Heat Flux Sensor ◽  
Thermal Measurements ◽  
The One ◽  
Radial Arrangement ◽  
The Heat Transfer Coefficient ◽  
Flux Sensor

The thermal behavior of a microcooler has been investigated using two different measurement methods to verify their feasibility. On the one hand structure function derived from the thermal measurements was used, while on the other hand, characterization was done with a heat-flux sensor array. The measurement sample was a square nickel plate microcooler holding 128 microchannels in radial arrangement. In our previous studies it was attached to a power transistor which was used as a dissipator and a temperature sensor. The thermal transient response to a dissipation step of the transistor was recorded in the measurement. The measured transients (cooling curves) were transformed into structure functions from which the partial thermal resistance corresponding to the cooling assembly was identified. In the current study the measurement setup was completed by a heat-flux sensor inbetween the dissipator and the microcooler to be able to verify the results extracted via structure functions. In this way we could compare the heat-transfer coefficient (HTC) values obtained from the identified thermal resistances to those calculated directly from the measured heat-flux values. Good matching of the HTC values resulting from the two different methods was found.

Flexible Heat Flux Sensor for Firefighters Garment Integration

2013 ◽  
Vol 4 (1) ◽  
pp. 36-45
Author(s):  
Christelle Navone ◽  
Mathieu Soulier ◽  
Isabella Chartier ◽  
Julia Simon ◽  
Aurelien Oliveira ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermoelectric Materials ◽  
Low Cost ◽  
High Sensitivity ◽  
Heat Flux Sensor ◽  
Proof Of Concept ◽  
Fire Fighters ◽  
European Project ◽  
Heat Flux Sensors ◽  
Flux Sensor

The interest in using optimal equipment to face unknown hazards is growing, as it ultimately save lives. This holds especially true for fire-fighters which are confronted with other hazards during the course of operations. Improvement of their security by an integrated sensory clothing system was the main objective of the European project ProeTEX. In this context, the integration of commercial heat flux sensors into fire-fighters garment has proved the interest of such measurements. However, low flexibility and high cost remain major disadvantages of these sensors. The objective of this work is to develop an innovative heat flux sensor based on a low cost technology. Heat flux sensors have been realized using printable thermoelectric materials and present high sensitivity (146 mV/ (W/cm2)). Their flexibility is compatible with integration in clothes and three specific integrations are proposed and compared. Proof of concept of flexible heat flux sensor is also presented in this paper.

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