scholarly journals Temperature Sensors: Review of Flexible Temperature Sensing Networks for Wearable Physiological Monitoring (Adv. Healthcare Mater. 12/2017)

2017 ◽  
Vol 6 (12) ◽  
Author(s):  
Qiao Li ◽  
Li‐Na Zhang ◽  
Xiao‐Ming Tao ◽  
Xin Ding
Keyword(s):  
Temperature Sensors ◽  
Temperature Sensing ◽  
Physiological Monitoring

scholarly journals Textile-Integrated Thermocouples for Temperature Measurement

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 626 ◽  
Author(s):  
Waleri Root ◽  
Thomas Bechtold ◽  
Tung Pham
Keyword(s):  
Output Signal ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Temperature Gradients ◽  
Thermoelectric Effects ◽  
Support Materials ◽  
Conductive Materials ◽  
Voltage Output ◽  
Cold Junction ◽  
Polymeric Carbon

The integration of conductive materials in textiles is key for detecting temperature in the wearer´s environment. When integrating sensors into textiles, properties such as their flexibility, handle, and stretch must stay unaffected by the functionalization. Conductive materials are difficult to integrate into textiles, since wires are stiff, and coatings show low adhesion. This work shows that various substrates such as cotton, cellulose, polymeric, carbon, and optical fiber-based textiles are used as support materials for temperature sensors. Suitable measurement principles for use in textiles are based on resistance changes, optical interferences (fiber Bragg grating), or thermoelectric effects. This review deals with developments in the construction of temperature sensors and the production of thermocouples for use in textiles. The operating principle of thermocouples is based on temperature gradients building up between a heated and a cold junction of two conductors, which is converted to a voltage output signal. This work also summarizes integration methods for thermocouples and other temperature-sensing techniques as well as the manufacture of conductive materials in textiles. In addition, textile thermocouples are emphasized as suitable and indispensable elements in sensor concepts for smart textiles.

scholarly journals Flexible Temperature Sensor Integrated with Soft Pneumatic Microactuators for Functional Microfingers

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Satoshi Konishi ◽  
Akiya Hirata
Keyword(s):  
Thin Film ◽  
Temperature Sensor ◽  
Output Voltage ◽  
Temperature Sensors ◽  
Seebeck Effect ◽  
Temperature Sensing ◽  
Bending Test ◽  
Contact Detection ◽  
Dissimilar Metals

Abstract The integration of a flexible temperature sensor with a soft microactuator (a pneumatic balloon actuator) for a functional microfinger is presented herein. A sensor integrated with a microactuator can actively approach a target for contact detection when a distance exists from the target or when the target moves. This paper presents a microfinger with temperature sensing functionality. Moreover, thermocouples, which detect temperature based on the Seebeck effect, are designed for use as flexible temperature sensors. Thermocouples are formed by a pair of dissimilar metals or alloys, such as copper and constantan. Thin-film metals or alloys are patterned and integrated in the microfinger. Two typical thermocouples (K-type and T-type) are designed in this study. A 2.0 mm × 2.0 mm sensing area is designed on the microfinger (3.0 mm × 12 mm × 400 μm). Characterization indicates that the output voltage of the sensor is proportional to temperature, as designed. It is important to guarantee the performance of the sensor against actuation effects. Therefore, in addition to the fundamental characterization of the temperature sensors, the effect of bending deformation on the characteristics of the temperature sensors is examined with a repeated bending test consisting of 1000 cycles.

Fluidic Thermistors or Fluidic Temperature Sensing With Capillaries

1977 ◽  
Vol 99 (3) ◽  
pp. 406-411 ◽  
Author(s):  
T. M. Drzewiecki ◽  
R. M. Phillippi
Keyword(s):  
Experimental Investigation ◽  
Analytical Model ◽  
Dynamic Range ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Capillary Temperature ◽  
Sensor Gain

Described in this report is an analytical and experimental investigation of fluidic capillary temperature sensors and subsequent matching to a fluidic laminar gain block. Experimental sensor/gain-block sensitivities of 1.5 kPa/°C were obtained, which compared favorably with the analytical model. Assuming a dynamic range of 104, resolutions of 0.001°C are estimated.

scholarly journals PEDOT:PSS-Based Temperature-Detection Thread for Wearable Devices

2018 ◽  
Author(s):  
Jin-Woo Lee ◽  
Dong-Cheul Han ◽  
Han-Jae Shin ◽  
Se-Hyeok Yeom ◽  
Byeong-Kwon Ju ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Wearable Devices ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Polystyrene Sulfonate ◽  
Sensing Element ◽  
Temperature Detection ◽  
Military Applications ◽  
P Type

In this research, we developed a wearable temperature-sensing element by dip dyeing threads in poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (p-type conducting polymer) solution. The PEDOT:PSS was used to  dye the textile and it exhibited negative temperature coefficient characteristics in which the resistance decreases as the temperature increases. The fabricated temperature-detection thread achieved a sensitivity of 167.1 W/°C with 99.8% linearity in the temperature range of -50 to 80 °C. We anticipate that temperature sensors that apply our technology will be made as stitch- or textile-type for wearable devices, and they will be widely adopted for different applications such as in fitness, leisure, healthcare, medical treatment, infotainment, industry, and military applications, among others.

scholarly journals PEDOT:PSS-Based Temperature-Detection Thread for Wearable Devices

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2996 ◽  
Author(s):  
Jin-Woo Lee ◽  
Dong-Cheul Han ◽  
Han-Jae Shin ◽  
Se-Hyeok Yeom ◽  
Byeong-Kwon Ju ◽  
...  
Keyword(s):  
Negative Temperature Coefficient ◽  
Negative Temperature ◽  
Wearable Devices ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Polystyrene Sulfonate ◽  
Sensing Element ◽  
Temperature Detection ◽  
Military Applications ◽  
P Type

In this research, we developed a wearable temperature-sensing element by dip dyeing threads in poly (3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) (p-type conducting polymer) solution. The PEDOT:PSS was used to dye the textile and it exhibited negative temperature coefficient characteristics in which the resistance decreases as the temperature increases. The fabricated temperature-detection thread achieved a sensitivity of 167.1 Ω/°C with 99.8% linearity in the temperature range of −50 °C to 80 °C. We anticipate that temperature sensors that apply our technology will be made as stitch- or textile-type for wearable devices, and they will be widely adopted for different applications such as in fitness, leisure, healthcare, medical treatment, infotainment, industry, and military applications, among others.

794 nm excited core–shell upconversion nanoparticles for optical temperature sensing

RSC Advances ◽  
2016 ◽  
Vol 6 (14) ◽  
pp. 11795-11801 ◽  
Author(s):  
Guicheng Jiang ◽  
Shaoshuai Zhou ◽  
Xiantao Wei ◽  
Yonghu Chen ◽  
Changkui Duan ◽  
...  
Keyword(s):  
Temperature Sensors ◽  
Temperature Sensing ◽  
Excitation Wavelength ◽  
Upconversion Nanoparticles ◽  
Core Shell

Nd3+ sensitized core–shell upconversion nanoparticles (UNCPs) are promising candidates for application in optical temperature sensors at a biocompatible excitation wavelength (794 nm).

scholarly journals Internal field study of 21700 battery based on long-life embedded wireless temperature sensor

2021 ◽  
Author(s):  
Le Yang ◽  
Na Li ◽  
Likun Hu ◽  
Shaoqi Wang ◽  
Lin Wang ◽  
...  
Keyword(s):  
Integrated Circuit ◽  
Signal Transmission ◽  
Lithium Ion ◽  
Internal Field ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Signal Modulation ◽  
Internal Measurement ◽  
Accurate Temperature

AbstractThe safety of lithium-ion batteries is an essential concern where instant and accurate temperature sensing is critical. It is generally desired to put sensors inside batteries for instant sensing. However, the transmission of internal measurement outside batteries without interfering their normal state is a non-trivial task due to the harsh electrochemical environment, the particular packaging structures and the intrinsic electromagnetic shielding problems of batteries. In this work, a novel in-situ temperature sensing framework is proposed by incorporating temperature sensors with a novel signal transmission solution. The signal transmission solution uses a self-designed integrated-circuit which modulates the internal measurements outside battery via its positive pole without package breaking. Extensive experimental results validate the noninterference properties of the proposed framework. Our proposed in-situ temperature measurement by the self-designed signal modulation solution has a promising potential for in-situ battery health monitoring and thus promoting the development of smart batteries. Graphic abstract

scholarly journals Temperature-Sensing Inks Using Electrohydrodynamic Inkjet Printing Technology

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5623
Author(s):  
Ju-Hun Ahn ◽  
Hee-Ju Hong ◽  
Chang-Yull Lee
Keyword(s):  
Inkjet Printing ◽  
Electronic Devices ◽  
Thermal Control ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Flexible Substrates ◽  
Curved Surfaces ◽  
Printing Technology ◽  
Inkjet Printing Technology ◽  
Line Widths

Temperature measurement is very important for thermal control, which is required for the advancement of mechanical and electronic devices. However, current temperature sensors are limited by their inability to measure curved surfaces. To overcome this problem, several methods for printing flexible substrates were proposed. Among them, electrohydrodynamic (EHD) inkjet printing technology was adopted because it has the highest resolution. Since EHD inkjet printing technology is limited by the type of ink used, an ink with temperature-sensing properties was manufactured for use in this printer. To confirm the applicability of the prepared ink, its resistance characteristics were investigated, and the arrangement and characteristics of the particles were observed. Then, the ink was printed using the EHD inkjet approach. In addition, studies of the meniscus shapes and line widths of the printed results under various conditions confirmed the applicability of the ink to the EHD inkjet printing technology and the change in its resistance with temperature.

Resistances of Carbon Black and Polymers in Smart Paints for Temperature Sensors

2021 ◽  
Vol 21 (7) ◽  
pp. 3716-3720
Author(s):  
Ju-Hun Ahn ◽  
Dae-San Choi ◽  
Chang-Yull Lee
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Carbon Black ◽  
Temperature Sensors ◽  
Temperature Sensing ◽  
Sem Images ◽  
Electrical Components ◽  
And Control ◽  
Polymer Type ◽  
Scanning Electron

Temperature sensing and control is an important factor to prevent the overheating of mechanical and electrical components in various devices. However, commercialized temperature sensors can be disadvantageous due to their limited shapes. Therefore, we propose a smart paint to solve this issue. In this study, smart paints were produced based on carbon black, and their properties were measured using thermistors. Experiments were conducted to analyze the resistance properties using carbon and four types of polymers. Through the scanning electron microscopy (SEM) images of the mixed paints, it was shown that the resistances were decreased due to the necking phenomena. Furthermore, each paint provides a different temperature coefficient depending on the polymer type.

Upconversion luminescence and optical temperature-sensing property of LiNbO3:Yb3+/Er3+ nanoparticles

CrystEngComm ◽  
2022 ◽  
Author(s):  
Xuan Tong ◽  
Xin Zhou ◽  
XunZe Tang ◽  
Yonggang Min ◽  
XiaoLong Li ◽  
...  
Keyword(s):  
Annealing Temperature ◽  
Upconversion Luminescence ◽  
Average Diameter ◽  
Temperature Sensors ◽  
Temperature Sensing

LiNbO3:Yb3+/Er3+ nanocubes with the average diameter of approximately 500 nm were firstly applied in non-invasion optical temperature sensors. As increasing the annealing temperature, a two orders of magnitude enhancement of...

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