scholarly journals Quartz Enhanced Conductance Spectroscopy for Polymer Nano-Mechanical Thermal Analysis

2020 ◽  
Vol 10 (14) ◽  
pp. 4954
Author(s):  
Shangzhi Li ◽  
Bo Sun ◽  
Zhijin Shang ◽  
Biao Li ◽  
Ruyue Cui ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Melting Temperature ◽  
Tuning Fork ◽  
Low Cost ◽  
Quartz Tuning Fork ◽  
Analysis Method ◽  
Fast Analysis ◽  
Wire Sample ◽  
Melting Temperatures ◽  
Nanogram Level

A fast and highly sensitive polymer nano-mechanical thermal analysis method for determining the melting temperature (Tm) of polymer microwires was proposed. In this method, a small-size, low-cost quartz tuning fork was used as a piezoelectric transducer to analyze the thermodynamics of polymer microwires at the nanogram level without changing its own properties. Due to the thin wire sample, which has a length of 1.2 mm and a diameter of ~5 µm, which is bridged across the prongs of the tuning fork, the nanogram-level sample greatly reduces the thermal equilibrium time for the measurement, resulting in a fast analysis for the melting temperature of the polymer sample. Compared with the traditional method, the analysis method based on the quartz enhanced conductivity spectrum (QECS) does not require annealing before measurement, which is an essential process for conventional thermal analysis to reduce the hardness, refine the grain, and eliminate the residual stress. In this work, the melting temperatures of three of the most commonly used polymers, namely polymers polymethyl methacrylate, high-density polyethylene, and disproportionated rosin, were obtained under the temperature from room temperature to >180 °C, proving the QECS method to be a useful tool for nano-mechanical thermal analysis.

A new low‐cost high‐performance quartz tuning‐fork temperature sensor

Sensor Review ◽  
2003 ◽  
Vol 23 (2) ◽  
pp. 134-142 ◽  
Author(s):  
He Jin ◽  
Chen Zhaoyang ◽  
Lin Jiang ◽  
Dai Jingmin
Keyword(s):  
Temperature Sensor ◽  
High Performance ◽  
Tuning Fork ◽  
Low Cost ◽  
Quartz Tuning Fork

Design, Development and Testing of Quartz Tuning Fork Temperature Sensor

2011 ◽  
Vol 483 ◽  
pp. 143-147
Author(s):  
Jing Ma ◽  
Jun Xu ◽  
Bo You
Keyword(s):  
Temperature Sensor ◽  
Tuning Fork ◽  
Low Cost ◽  
Quartz Tuning Fork ◽  
Design Development ◽  
Metal Electrodes ◽  
Crystalline Quartz ◽  
Flexural Mode ◽  
External Temperature ◽  
Satisfactory Performance

In this paper, a low cost quartz tuning fork temperature sensor adopting H-shaped tuning fork resonator to address miniaturization, high resolution and high stability has been designed, developed and tested. The quartz tuning temperature sensor is designed vibrating in flexural mode with a new thermo-sensitive cut. The quartz tuning fork temperature sensor consists of two prongs connected at one end of crystalline quartz plate with thin-film metal electrodes deposited on the faces, which is used to produce vibration in response to alternating voltages and detecting the resonance frequency in the meantime. When an external temperature is change, there is a shift in its natural frequency. Based on this principle, a resonant thermometer is designed. Finite element method is used to analyze the vibratory modes and optimize the structure. The whole structure is 500μm thickness, the length of tuning fork arm is 3076μm and the width of tuning fork arm is 600um, the frequency of tuning fork is about 37kHz with a sensitivity of rough 85 ppm/°C. The experimental results shown that a temperature accuracy of 0.01 °C and a resolution of 0.005 °C within temperature range from 0 °C to 100 °C. All these research are helpful to design satisfactory performance of the sensor for temperature measurement.

scholarly journals Quartz Tuning Fork Sensor-Based Dosimetry for Sensitive Detection of Gamma Radiation

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7035
Author(s):  
Nadyah Alanazi ◽  
Abdullah N. Alodhayb ◽  
Atheer Almutairi ◽  
Hanan Alshehri ◽  
Sarah AlYemni ◽  
...  
Keyword(s):  
Gamma Radiation ◽  
Resonance Frequency ◽  
Tuning Fork ◽  
Low Cost ◽  
Radiation Detector ◽  
Quartz Tuning Fork ◽  
Fast Response ◽  
Gold Coating ◽  
Before And After ◽  
Small Change

This study generally relates to nuclear sensors and specifically to detecting nuclear and electromagnetic radiation using an ultrasensitive quartz tuning fork (QTF) sensor. We aim to detect low doses of gamma radiation with fast response time using QTF. Three different types of QTFs (uncoated and gold coated) were used in this study in order to investigate their sensitivity to gamma radiations. Our results show that a thick gold coating on QTF can enhance the quality factor and increase the resonance frequency from 32.7 to 32.9 kHz as compared to uncoated QTF. The results also show that increasing the surface area of the gold coating on the QTF can significantly enhance the sensitivity of the QTF to radiation. We investigated the properties of gold-coated and uncoated QTFs before and after irradiation by scanning electron microscopy. We further investigated the optical properties of SiO2 wafers (quartz) by spectroscopic ellipsometry (SE). The SE studies revealed that even a small change in the microstructure of the material caused by gamma radiation would have an impact on mechanical properties of QTF, resulting in a shift in resonance frequency. Overall, the results of the experiments demonstrated the feasibility of using QTF sensors as an easy to use, low-cost, and sensitive radiation detector.

scholarly journals Design of a Portable and Low-Cost Mass Sensitive Quartz Tuning Fork Sensor

Proceedings ◽  
2017 ◽  
Vol 1 (8) ◽  
pp. 803
Author(s):  
Mehmet Altay Ünal ◽  
Dilek Çökeliler Serdaroğlu ◽  
İsmail Cengiz Koçum
Keyword(s):  
Tuning Fork ◽  
Low Cost ◽  
Quartz Tuning Fork

DTA/TGA Study of Eutectic Melting in the System BaF2-BaO-Y2O3-CuOx−H2O

2000 ◽  
Vol 659 ◽  
Author(s):  
Lawrence P. Cook ◽  
Winnie Wong-Ng ◽  
Julia Suh
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thermogravimetric Analysis ◽  
Melting Temperature ◽  
Coated Conductors ◽  
Ex Situ ◽  
Log P ◽  
Eutectic Melting ◽  
Melting Temperatures ◽  
C 30

ABSTRACTDifferential thermal analysis and thermogravimetric analysis (DTA/TGA) experiments have been completed in the BaF2-BaO-Y2O3-CuOx-H2O system at various oxygen pressures to determine the effect of adding solid BaF2and gaseous H2O (at pH2O = 2.5 kPa) on the eutectic melting in the system BaO-Y2O3-CuOx. We have investigated the eutectic melting temperature over the range of pO2 = 20 Pa to pO2 = 0.1 MPa under the following conditions: 1) without BaF2 or H2O; 2) with H2O only; 3) with BaF2 only; 4) with both BaF2 and H2O. Results indicate that without BaF2 or H2O, eutectic melting is depressed from 917°C at pO2 = 0.1 MPa to 838°C at pO2 = 1 kPa. At oxygen pressures below 1 kPa, down to pO2 = 20 Pa, no further lowering of eutectic melting temperature was observed. The topologies of the temperature vs. log pO2 curves for various combinations of BaF2 and H2O were similar to that for the experiments without BaF2 or H2O, but all curves were shifted to lower temperatures. For the experiments with addition of BaF2 only, H2O only, and BaF2 with H2O, the eutectic melting temperatures as a function of pO2 were lowered by, respectively, 5°C - 15°C, 15°C - 25°C and 20°C - 30°C. Application of results to the “BaF2ex-situ” method of processing Ba2YCu3Ox coated conductors is discussed.

scholarly journals A Low-Cost Optoacoustic Sensor for Environmental Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1379
Author(s):  
Antonios Stylogiannis ◽  
Nikolaos Kousias ◽  
Anastasios Kontses ◽  
Leonidas Ntziachristos ◽  
Vasilis Ntziachristos
Keyword(s):  
Climate Change ◽  
Continuous Monitoring ◽  
Tuning Fork ◽  
Low Cost ◽  
Quartz Tuning Fork ◽  
Acoustic Energy ◽  
Energy Losses ◽  
Gaseous Pollutants ◽  
The Cost ◽  
Good Agreement

Attention to Black Carbon (BC) has been rising due to its effects on human health as well its contribution to climate change. Measurements of BC are challenging, as currently used devices are either expensive or impractical for continuous monitoring. Here, we propose an optoacoustic sensor to address this problem. The sensor utilizes a novel ellipsoidal design for refocusing the optoacoustic signal with minimal acoustic energy losses. To reduce the cost of the system, without sacrificing accuracy, an overdriven laser diode and a Quartz Tuning Fork are used as the light source and the sound detector, respectively. The prototype was able to detect BC particles and to accurately monitor changes in concentration in real time and with very good agreement with a reference instrument. The response of the sensor was linearly dependent on the BC particles concentration with a normalized noise equivalent absorption coefficient (NNEA) for soot equal to 7.39 × 10−9 W cm−1 Hz−1/2. Finally, the prototype was able to perform NO2 measurements, demonstrating its ability to accurately monitor both particulate and gaseous pollutants. The proposed sensor has the potential to offer a significant economic impact for BC environmental measurements and source appointment technologies.

Low-cost quartz tuning fork based methane sensor for coal mine safety applications

2019 ◽  
Vol 295 ◽  
pp. 7-11 ◽  
Author(s):  
Xiaoyu Chen ◽  
Xiaoce Feng ◽  
Xiaojun Liu ◽  
Xiangqun Zeng ◽  
Yong Xu
Keyword(s):  
Coal Mine ◽  
Tuning Fork ◽  
Low Cost ◽  
Quartz Tuning Fork ◽  
Mine Safety ◽  
Methane Sensor ◽  
Coal Mine Safety ◽  
Safety Applications

Effect of Copper and Zinc on Microstructures, Melting Points and Corrosion Resistance of Sn-Zn-Cu-Bi Soldering Alloys

2015 ◽  
Vol 658 ◽  
pp. 59-63
Author(s):  
Weerawat Terdthaichairat ◽  
Payoon Senthongkaew ◽  
Ratchatee Techapiesancharoenkij
Keyword(s):  
Corrosion Resistance ◽  
Intermetallic Compound ◽  
Melting Temperature ◽  
Low Cost ◽  
Optical Microscope ◽  
Cu Content ◽  
Melting Temperatures ◽  
Soldering Alloys ◽  
Effect Of Copper ◽  
Corrosion And Oxidation

Sn-Zn alloy is one of the Pb-free systems that are promising because of its relatively low melting temperature and low cost. However, Zn exhibits poor corrosion and oxidation resistance that hinders its soldering applications. The objective of this research is to study the effect of Zn and Cu alloying contents on the Sn-Zn performance. Four compositions of Sn-Zn alloys were studied in this research including: Sn-7Zn, Sn-9Zn, Sn-9Zn-2Cu-Bi, and Sn-9Zn-4Cu-Bi. The microstructures were studied using Optical Microscope (OM) and Scanning Electron Microscope (SEM). The melting temperatures and corrosion resistance of the alloys were evaluated by Differential Scanning Calorimeter (DSC) and Potentiodynamic Polarization technique, respectively. The results showed that an increase in the Cu-to-Zn ratio led to better corrosion resistance. The selective corrosion of the Zn-rich phase could be visibly observed, with OM, on the post-corrosion samples. With the Cu alloying, the Cu and Zn formed an intermetallic compound resulting in a higher value of Ecorr. However, the higher Cu content caused a significant increase in the liquidus temperature due to the Cu-Zn intermetallic compound, of which the melting temperature is higher than 400 °C, resulting in an incomplete melting at low temperature.

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