Heat flux measurements at Teide Volcano, Tenerife, Canary Islands, by means of thermal imaging

2020 ◽  
Author(s):  
Ana Carolina Montañez Hernández ◽  
Enrica Marotta ◽  
Germán D. Padilla ◽  
Rosario Peluso ◽  
Pedro A. Hernández ◽  
...  
Keyword(s):  
Heat Flux ◽  
Specific Area ◽  
Thermal Anomaly ◽  
Heat Flux Sensor ◽  
Infrared Images ◽  
Thermal Camera ◽  
Monthly Basis ◽  
Thermal Images ◽  
Flux Measurements ◽  
The One

<p>Nowadays, scientific surveys to evaluate the thermal energy release from volcanoes are very tedious and involve performing numerous measure points to determine the heat flux of a specific area. This study tests a new method to calculate the heat flux from Teide inner crater using thermal images without the need for on-site heat flow campaigns. So far, panoramic infrared images of the study area and infrared images of thermal anomaly zones at a distance of 1 meter have been carried out in a monthly basis with a FLIR T660 thermal camera. Soil temperature of study area was also measured with a K-type thermocouple in order to compare the results between the temperature measured with the thermocouple and the one obtained by the thermal camera. The method developed in Marotta et al. 2019 to determine the heat flux from thermal images will be adapted to the peculiarities of the Teide stratovolcano, such as the topography of the inner crater. To check the reliability of the method, values obtained with a heat flux sensor, by means of the temperature gradient and those resulting from the application of the developed method are compared. Finally, the error associated to the use of thermography at a greater distance to calculate heat flux is analysed by comparing the results obtained when applying the method with thermographic images taken at 1 meter with the results obtained when applying it with the panoramic thermal images of the crater, taken at approximately 50 metres.</p>

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.

Time-Resolved Heat Transfer Measurements on the Tip Wall of a Ribbed Channel Using a Novel Heat Flux Sensor: Part I — Sensor and Benchmarks

2006 ◽  
Author(s):  
Tim Roediger ◽  
Helmut Knauss ◽  
Uwe Gaisbauer ◽  
Ewald Kraemer ◽  
Sean Jenkins ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Turbine Blades ◽  
Temperature Fields ◽  
Heat Flux Sensor ◽  
Internal Cooling ◽  
Time Resolved ◽  
Flux Measurements ◽  
Working Principle ◽  
Flux Sensor

A novel heat flux sensor was tested which allows for time-resolved heat flux measurements in internal ribbed channels related to the study of passages in gas turbine blades. The working principle of the Atomic Layer Thermopile (ALTP) sensor is based on a thermoelectric field created by a temperature gradient over an YBCO crystal (the transverse Seebeck effect). The sensors very fast frequency response allows for highly time-resolved heat flux measurements up to the 1 MHz range. This paper explains the design and working principle of the sensor, as well as the benchmarking of the sensor for several flow conditions. For internal cooling passages, this novel sensor allows for highly accurate, time-resolved measurements of heat transfer coefficients, leading to a greater understanding of the influence of fluctuations in temperature fields.

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

scholarly journals Quantification of Heat Flux From a Reacting Thermite Spray

2009 ◽  
Author(s):  
Eric Nixon ◽  
Michelle Pantoya ◽  
Daniel Prentice
Keyword(s):  
Heat Flux ◽  
Response Time ◽  
Energetic Materials ◽  
Energetic Material ◽  
Heat Flux Sensor ◽  
Diagnostic Tools ◽  
Test Duration ◽  
Inverse Heat Conduction ◽  
Flux Measurements ◽  
Combustion Behaviors

Characterizing the combustion behaviors of energetic materials requires diagnostic tools that are often not readily or commercially available. For example, a jet of thermite spray provides a high temperature and pressure reaction that can also be highly corrosive and promote undesirable conditions for the survivability of any sensor. Developing a diagnostic to quantify heat flux from a thermite spray is the objective of this study. Quick response sensors such as thin film heat flux sensors can not survive the harsh conditions of the spray, but more rugged sensors lack the response time for the resolution desired. A sensor that will allow for adequate response time while surviving the entire test duration was constructed. The sensor outputs interior temperatures of the probes at known locations and utilizes an inverse heat conduction code to calculate heat flux values. The details of this device are discussed and illustrated. Temperature and heat flux measurements of various thermite spray conditions are reported. Results indicate that this newly developed energetic material heat flux sensor provides quantitative data with good repeatability.

Time-Resolved Heat Transfer Measurements on the Tip Wall of a Ribbed Channel Using a Novel Heat Flux Sensor—Part I: Sensor and Benchmarks

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Tim Roediger ◽  
Helmut Knauss ◽  
Uwe Gaisbauer ◽  
Ewald Kraemer ◽  
Sean Jenkins ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Turbine Blades ◽  
Temperature Fields ◽  
Heat Flux Sensor ◽  
Internal Cooling ◽  
Time Resolved ◽  
Flux Measurements ◽  
Working Principle ◽  
Flux Sensor

A novel heat flux sensor was tested that allows for time-resolved heat flux measurements in internal ribbed channels related to the study of passages in gas turbine blades. The working principle of the atomic layer thermopile (ALTP) sensor is based on a thermoelectric field created by a temperature gradient over an yttrium-barium-copper-oxide (YBCO) crystal (the transverse Seebeck effect). The sensors very fast frequency response allows for highly time-resolved heat flux measurements up to the 1MHz range. This paper explains the design and working principle of the sensor, as well as the benchmarking of the sensor for several flow conditions. For internal cooling passages, this novel sensor allows for highly accurate, time-resolved measurements of heat transfer coefficients, leading to a greater understanding of the influence of fluctuations in temperature fields.

scholarly journals Измерение существенно нестационарных тепловых потоков градиентным датчиком на основе висмута

2021 ◽  
Vol 91 (2) ◽  
pp. 240
Author(s):  
Ю.В. Добров ◽  
В.А. Лашков ◽  
И.Ч. Машек ◽  
А.В. Митяков ◽  
В.Ю. Митяков ◽  
...  
Keyword(s):  
Heat Flux ◽  
Processing Method ◽  
Heat Flux Sensor ◽  
Frontal Surface ◽  
One Dimensional ◽  
Data Processing Method ◽  
Bismuth Single Crystal ◽  
Laser Discharge ◽  
The One ◽  
Flux Sensor

In this work we performed calibration of the gradient heat flux sensor made of bismuth single crystal. The value of the volt-watt sensitivity of the sensor is found and a data processing method based on the one-dimensional heat equation for a thin plate is presented. An experimental study of the heat flux on the frontal surface of the cylinder after a laser discharge was carried out. The data obtained as a result of the experiment were processed by the proposed method.

Wearable Core Temperature Thermometer Implemented by the MEMS Heat Flux Sensor

2015 ◽  
Vol 135 (8) ◽  
pp. 343-348
Author(s):  
Shinya Nakagawa ◽  
Masao Shimizu ◽  
Tsuyoshi Hamaguchi
Keyword(s):  
Heat Flux ◽  
Core Temperature ◽  
Heat Flux Sensor ◽  
Flux Sensor

QUANTIFYING ERRORS IN HEAT FLUX MEASUREMENTS USING A VERTICAL SEQUENCE OF THERMOCOUPLE SENSORS

2016 ◽  
Author(s):  
Gabriela Villegas ◽  
◽  
Jerry P. Fairley ◽  
Cary R. Lindsey ◽  
Megan M. Aunan ◽  
...  
Keyword(s):  
Heat Flux ◽  
Flux Measurements
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