Microwave Diamond-based HBAR as Ultrathin Film Sensor. Pt Deposition

The paper presents a method, tools and a newly developed algorithm for experimentally determining heat transfer coefficients in organic liquids and solutions. This work is made relevant by the problem of development of a new generation of aerospace technology. In this connection, improvements have been made to the pulse method of determining heat transfer coefficients that is based on the use of a micron-thick film sensor. The measurement setup was modified. A math model was constructed for the measuring sensor. Algorithms were developed for conducting the experiment and processing measurement results to determine heat transfer coefficients. Experimental uncertainties were analyzed. The paper provides results of experimental studies on certain organic liquids. The authors believe that the material presented in the paper will find application in research conducted at research institutions, engineering offices and universities, among researches, postgraduates and students. Key words: thermal and physical characteristics, organic liquids and their solutions, film-type electrical resistor, thin-film temperature sensor, voltage pulse, resistance thermometer, irregular heat transfer regime.

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Wearable Vibration Sensor for Measuring the Wing Flapping of Insects

Sensors ◽

10.3390/s21020593 ◽

2021 ◽

Vol 21 (2) ◽

pp. 593

Author(s):

Ryota Yanagisawa ◽

Shunsuke Shigaki ◽

Kotaro Yasui ◽

Dai Owaki ◽

Yasuhiro Sugimoto ◽

...

Keyword(s):

High Speed ◽

Environmental Changes ◽

Underlying Mechanism ◽

Indirect Measurement ◽

Feedback Mechanism ◽

The Body ◽

Vibration Sensor ◽

Wingbeat Frequency ◽

Film Sensor ◽

Insect Wing

In this study, we fabricated a novel wearable vibration sensor for insects and measured their wing flapping. An analysis of insect wing deformation in relation to changes in the environment plays an important role in understanding the underlying mechanism enabling insects to dynamically interact with their surrounding environment. It is common to use a high-speed camera to measure the wing flapping; however, it is difficult to analyze the feedback mechanism caused by the environmental changes caused by the flapping because this method applies an indirect measurement. Therefore, we propose the fabrication of a novel film sensor that is capable of measuring the changes in the wingbeat frequency of an insect. This novel sensor is composed of flat silver particles admixed with a silicone polymer, which changes the value of the resistor when a bending deformation occurs. As a result of attaching this sensor to the wings of a moth and a dragonfly and measuring the flapping of the wings, we were able to measure the frequency of the flapping with high accuracy. In addition, as a result of simultaneously measuring the relationship between the behavior of a moth during its search for an odor source and its wing flapping, it became clear that the frequency of the flapping changed depending on the frequency of the odor reception. From this result, a wearable film sensor for an insect that can measure the displacement of the body during a particular behavior was fabricated.

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Ammonia gas sensing with tin oxide thin film sensor and coplanar microheater

10.1063/5.0031525 ◽

2020 ◽

Author(s):

Shobi Bagga ◽

Jamil Akhtar ◽

Sanjeev Mishra

Keyword(s):

Thin Film ◽

Tin Oxide ◽

Gas Sensing ◽

Oxide Thin Film ◽

Film Sensor ◽

Ammonia Gas ◽

Thin Film Sensor

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Electrochemical Growth of Magnetic Alloys in the Ultrathin Film Limit

ECS Meeting Abstracts ◽

10.1149/ma2009-02/35/2679 ◽

2009 ◽

Keyword(s):

Ultrathin Film ◽

Magnetic Alloys ◽

Electrochemical Growth

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Smart Inlays for Simultaneous Crack Sensing and Arrest in Multifunctional Bondlines of Composites

Sensors ◽

10.3390/s21113852 ◽

2021 ◽

Vol 21 (11) ◽

pp. 3852

Author(s):

Chresten von der Heide ◽

Julian Steinmetz ◽

Martin J. Schollerer ◽

Christian Hühne ◽

Michael Sinapius ◽

...

Keyword(s):

Health Monitoring ◽

Composite Structures ◽

Sensory Function ◽

Film Sensor ◽

Adhesive Bonds ◽

Sensor Fabrication ◽

Manufacturing Procedure ◽

Static Mechanical ◽

Micro Sensor ◽

Cantilever Bending

Disbond arrest features combined with a structural health monitoring system for permanent bondline surveillance have the potential to significantly increase the safety of adhesive bonds in composite structures. A core requirement is that the integration of such features is achieved without causing weakening of the bondline. We present the design of a smart inlay equipped with a micro strain sensor-system fabricated on a polyvinyliden fluorid (PVDF) foil material. This material has proven disbond arrest functionality, but has not before been used as a substrate in lithographic micro sensor fabrication. Only with special pretreatment can it meet the requirements of thin film sensor elements regarding surface roughness and adhesion. Moreover, the sensor integration into composite material using a standard manufacturing procedure reveals that the smart inlays endure this process even though subjected to high temperatures, curing reactions and plasma treatment. Most critical is the substrate melting during curing when sensory function is preserved with a covering caul plate that stabilizes the fragile measuring grids. The smart inlays are tested by static mechanical loading, showing that they can be stretched far beyond critical elongations of composites before failure. The health monitoring function is verified by testing the specimens with integrated sensors in a cantilever bending setup. The results prove the feasibility of micro sensors detecting strain gradients on a disbond arresting substrate to form a so-called multifunctional bondline.

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