Two-Dimensional Temperature Measurement in Free Boundary Environment by Using Moiré Deflectometry With Monochrome LED Lamp

2013 ◽  
Author(s):  
Chien-Chih Chen ◽  
Ying-Yan Wu ◽  
Chen-Ching Ting
Keyword(s):  
Temperature Distribution ◽  
Free Boundary ◽  
Temperature Measurement ◽  
Low Cost ◽  
Vertical Wall ◽  
Ccd Camera ◽  
Laser Printer ◽  
Measured Temperature ◽  
Two Dimensional ◽  
Moiré Deflectometry

This article develops low cost moiré deflectometry for two-dimensional temperature measurement in free boundary environment. Experimental setup uses a red monochrome LED lamp with wavelength range of 625–635 nm as light source. In process, the light first runs through the convex lens and then propagates to the parabolic mirror with diameter of 406 mm and f/4.5 for generating the parallel light. The parallel light further propagates to test object and through two gratings with both pitch 254 lpi which are printed by laser printer. Behind the two gratings, a CCD camera is applied to capture the image, the distorted fringes. Based on the moiré deflectometry theory, the two-dimensional temperature distribution in free boundary environment can be determined in terms of the captured fringe shift analysis. This work has successfully measured the two-dimensional temperature distribution in free boundary environment with heat source models of 40–95 °C vertical wall, 60 W light bulb, and burning candle flame. The measured temperature deviations between moiré deflectometry and thermocouple thermometer are all less than 5%.

A Monochrome Light-Emitting Diode Moiré Deflectometry Technique for Two-Dimensional Temperature Measurement

2014 ◽  
Vol 136 (10) ◽  
Author(s):  
Jing-Nang Lee ◽  
Chien-Chih Chen
Keyword(s):  
Temperature Distribution ◽  
Free Boundary ◽  
Temperature Measurement ◽  
Light Emitting Diode ◽  
Vertical Wall ◽  
Laser Printer ◽  
Measured Temperature ◽  
Two Dimensional ◽  
Light Emitting ◽  
Moiré Deflectometry

This article develops low cost moiré deflectometry for two-dimensional temperature measurement in free boundary environment. Experimental setup uses a red monochrome light-emitting diode (LED) lamp with wavelength range of 625–635 nm as light source. In process, the light first runs through the convex lens and then propagates to the parabolic mirror with diameter of 406 mm and f/4.5 for generating the parallel light. The parallel light further propagates to test object and through two gratings both with pitch of 254 lpi which are printed by laser printer. Behind the two gratings, a CCD camera is applied to capture the image, the distorted fringes. Based on the moiré deflectometry theory, the two-dimensional temperature distribution in free boundary environment can be determined in terms of the captured fringe shift analysis. This work has successfully measured the two-dimensional temperature distribution in free boundary environment with heat source models of 40–95 °C vertical wall, 60 W light bulb, and burning candle flame. The measured temperature deviations between moiré deflectometry and thermocouple thermometer are all less than 5%.

scholarly journals On-Line Monitoring of the Axial Thermal Displacement of Machine Tools by Using a Laser Mouse Sensor

2021 ◽  
Author(s):  
Wen-Nan Cheng ◽  
Chih-Chun Cheng ◽  
Chih-Ming Tsai ◽  
Yu-Hsin Kuo ◽  
Wei-Ren Cheng
Keyword(s):  
Image Enhancement ◽  
Machine Tools ◽  
Low Cost ◽  
Image Correlation ◽  
Laser Printer ◽  
Two Dimensional ◽  
Thermal Displacement ◽  
Sensing System ◽  
Speckle Patterns ◽  
On Line

Abstract This paper presents a low-cost on-line system for monitoring the axial thermal displacement of machine tools. The proposed monitoring system includes an embedded optical sensor derived from a laser mouse; an image acquisition microcontroller; speckle patterns; and an edge computer that hosts software including an image display module, a displacement calculation module, an image enhancement module, and a data visualization module. The proposed sensing system can measure the displacement in two orthogonal directions simultaneously by employing digital image correlation; thus, the proposed system is a two-dimensional displacement sensor. The sensing system benefits from image enhancement techniques and customized optimal speckle patterns printed using a standard low-cost monochrome laser printer. Experimental results indicate that the proposed displacement sensing system has an accuracy and a precision of less than 5 mm in both orthogonal directions; however, the measurement range is only 1 mm for a static measurement. The two-dimensional displacement sensing system was used for the on-line monitoring of the thermal deformation of a feed drive system for machine tools, and the performance of the sensing system was assessed experimentally.

Temperature Measurement in Microfluidic Systems Using Photobleaching of a Fluorescent Slab

2008 ◽  
Author(s):  
Lin Gui ◽  
Carolyn L. Ren
Keyword(s):  
Temperature Distribution ◽  
Temperature Measurement ◽  
Rhodamine B ◽  
Fluorescent Dye ◽  
Measured Temperature ◽  
Pdms Layer ◽  
Temperature Dependent ◽  
Buffer Solution ◽  
Fluorescent Intensity ◽  
Dye Diffusion

Temperature control is key to microfluidic-based Lab-on-a-Chip devices for a variety of applications such as polymerase chain reaction for DNA amplification and isoelectric focusing for protein separation where pH gradients are thermally generated. The most widely used temperature measurement method involves the mixing of the buffer solution with a fluorescent dye, which has a temperature-dependent fluorescent intensity. The temperature distribution in the liquid can be obtained by monitoring the fluorescent intensity distribution in the channel. However, this method can not be easily applied to polymer-made microfluidic chips because of dye absorption and penetration into polymer chips, electrophoresis of dye which causes artificial temperature gradients, and inevitable photobleaching of fluorescent dye. Therefore, a novel method is developed and presented here for temperature measurement by utilizing photobleaching of fluorescent dye. This method includes two novel contributions: i) a specially developed model for converting temperature-dependent photobleaching speed distribution to temperature distribution, and ii) an introduction of a thin polydimethylsiloxane (PDMS) layer with saturated Rhodamine B for solving the above-mentioned dye diffusion and electrophoresis problems. In this new method, a thin PDMS layer saturated with Rhodamine B is bonded with another PDMS layer with microchannels instead of mixing the dye with the buffer solution. Therefore, the problems associated with dye diffusion into PDMS chips and electrophoresis when an electrical field is applied to channels are avoided. The developed theory is validated by comparing the experimentally measured temperature distribution with numerical predicted results. The theory and its validation will be presented and discussed.

scholarly journals On-Line Monitoring of The Axial Thermal Displacement of Machine Tools By Using A Laser Mouse Sensor

2021 ◽  
Author(s):  
Wen-Nan Cheng ◽  
Chih-Chun Cheng ◽  
Chih-Ming Tsai ◽  
Yu-Hsin Kuo ◽  
Wei-Ren Chen
Keyword(s):  
Image Enhancement ◽  
Machine Tools ◽  
Low Cost ◽  
Image Correlation ◽  
Laser Printer ◽  
Two Dimensional ◽  
Thermal Displacement ◽  
Sensing System ◽  
Speckle Patterns ◽  
On Line

Abstract This paper presents a low-cost on-line system for monitoring the axial thermal displacement of machine tools. The proposed monitoring system includes an embedded optical sensor derived from a laser mouse; an image acquisition microcontroller; speckle patterns; and an edge computer that hosts software including an image display module, a displacement calculation module, an image enhancement module, and a data visualization module. The proposed sensing system can measure the displacement in two orthogonal directions simultaneously by employing digital image correlation; thus, the proposed system is a two-dimensional displacement sensor. The sensing system benefits from image enhancement techniques and customized optimal speckle patterns printed using a standard low-cost monochrome laser printer. Experimental results indicate that the proposed displacement sensing system has an accuracy and a precision of less than 5 mm in both orthogonal directions; however, the measurement range is only 1 mm for a static measurement. The two-dimensional displacement sensing system was used for the on-line monitoring of the thermal deformation of a feed drive system for machine tools, and the performance of the sensing system was assessed experimentally.

Surface Temperature Measurement Using Infrared Radiometer by Applying a Pseudo-Gray-Body Approximation: Estimation of Radiative Property for Metal Surface

1996 ◽  
Vol 118 (1) ◽  
pp. 73-78 ◽  
Author(s):  
T. Inagaki ◽  
Y. Okamoto
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Surface Temperature ◽  
Temperature Measurement ◽  
Metal Surfaces ◽  
Radiative Properties ◽  
Two Dimensional ◽  
Visualization Technique ◽  
Surface Temperature Measurement ◽  
Infrared Radiometer

The visualization technique using an infrared radiometer has been widely used to estimate a two-dimensional temperature distribution on a surface. We have previously proposed various characteristics of the radiative properties for nonmetal surfaces on which the gray-body approximation can be used. However, the gray-body approximation can not be applied to glossy metal surfaces, because the influence of the reflected energy on the temperature measurement becomes severe. A pseudo-gray-body approximation is therefore proposed to estimate a temperature field on metal surfaces and its applicability is confirmed using an infrared radiometer with three detection wavelength bands.

Experimental Measurement of Two-Dimensional Circular Boundary Temperature Field by Acoustic Method

2014 ◽  
Vol 919-921 ◽  
pp. 313-317
Author(s):  
Li Wei Zhang ◽  
Ming Ji Wang ◽  
Wen Cao
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Experimental Measurement ◽  
Acoustic Method ◽  
Measured Temperature ◽  
Two Dimensional ◽  
Point Temperature ◽  
Boundary Temperature ◽  
Circular Boundary ◽  
Acoustic Thermometry

Acoustic thermometry method is used to measure two-dimensional temperature distribution of a circular boundary temperature field experimentally. The measured temperature field is compared with a point-by-point temperature measurement, the results shows that the acoustic method is consistent with the point-by-point measurement which proves that it is reliable to use this method to measure the two-dimensional temperature distribution.

Ti3C2-MXene/Bismuth Ferrite Nanohybrids for Efficient Degradation of Organic Dye and Colorless Pollutant

2019 ◽  
Author(s):  
Ayesha Tariq ◽  
M. Abdullah Iqbal ◽  
S. Irfan Ali ◽  
Muhammad Z. Iqbal ◽  
Deji Akinwande ◽  
...  
Keyword(s):  
Surface Area ◽  
Low Cost ◽  
Bismuth Ferrite ◽  
Organic Dye ◽  
Two Dimensional ◽  
Electron Hole ◽  
Photocatalytic Application ◽  
Electron Hole Pair ◽  
Pair Generation ◽  
Photocatalytic Applications

<p>Nanohybrids, made up of Bismuth ferrites/Carbon allotropes, are extensively used in photocatalytic applications nowadays. Our work proposes a nanohybrid system composed of Bismuth ferrite nanoparticles with two-dimensional (2D) MXene sheets namely, the BiFeO<sub>3</sub> (BFO)/Ti<sub>3</sub>C<sub>2</sub> (MXene) nanohybrid for enhanced photocatalytic activity. We have fabricated the BFO/MXene nanohybrid using simple and low cost double solvent solvothermal method. The SEM and TEM images show that the BFO nanoparticles were attached onto the MXene surface and in the inter-layers of two-dimensional (2D) MXene sheets. The photocatalytic application is tested for the visible light irradiation which showed the highest efficiency among all pure-BFO based photocatalysts, i.e. 100% degradation in 42 min for organic dye (Congo Red) and colorless aqueous pollutant (acetophenone) in 150 min, respectively. The present BFO-based hybrid system exhibited the large surface area of 147 m<sup>2</sup>g<sup>-1</sup>measured via Brunauer-Emmett-Teller (BET) sorption-desorption technique, and is found to be largest among BFO and its derivatives. Also, the photoluminescence (PL) spectra indicate large electron-hole pair generation. Fast and efficient degradation of organic molecules is supported by both factors; larger surface area and lower electron-hole recombination rate. The BFO/MXene nanohybrid presented here is a highly efficient photocatalyst compared to other nanostructures based on pure BiFeO<sub>3</sub> which makes it a promising candidate for many future applications.</p>

scholarly journals Microfabrication with Very Low-Average Power of Green Light to Produce PDMS Microchips

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 607
Author(s):  
Lucero M. Hernandez-Cedillo ◽  
Francisco G. Vázquez-Cuevas ◽  
Rafael Quintero-Torres ◽  
Jose L. Aragón ◽  
Miguel Angel Ocampo Mortera ◽  
...  
Keyword(s):  
Low Cost ◽  
Average Power ◽  
Green Light ◽  
Microfluidic Devices ◽  
Processing Parameters ◽  
Coating Film ◽  
Two Dimensional ◽  
Dimethyl Siloxane ◽  
Visible Laser ◽  
High Absorption

In this article, we show an alternative low-cost fabrication method to obtain poly(dimethyl siloxane) (PDMS) microfluidic devices. The proposed method allows the inscription of micron resolution channels on polystyrene (PS) surfaces, used as a mold for the wanted microchip’s production, by applying a high absorption coating film on the PS surface to ablate it with a focused low-power visible laser. The method allows for obtaining micro-resolution channels at powers between 2 and 10 mW and can realize any two-dimensional polymeric devices. The effect of the main processing parameters on the channel’s geometry is presented.

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