Interdigital capacitive strain gauges fabricated by direct-write thermal spray and ultrafast laser micromachining

Li, Jinggao; Longtin, Jon P.; Tankiewicz, S.; Gouldstone, Andrew; Sampath, Sanjay

doi:10.1016/j.sna.2006.04.008

Cited by 51 publications

(21 citation statements)

References 9 publications

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“…If the fingers of the sensor are displaced relative to each other by the component load, this results in a capacitive change ΔC . This is approximately proportional to the strain ε [230] (Figure 28).…”

Section: Hot Gas Component Monitoringmentioning

confidence: 99%

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Mevissen

Meo

2019

Sensors

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The need for non-destructive testing/structural health monitoring (SHM) is becoming increasingly important for gas turbine manufacturers. Incipient cracks have to be detected before catastrophic events occur. With respect to condition-based maintenance, the complex and expensive parts should be used as long as their performance or integrity is not compromised. In this study, the main failure modes of turbines are reported. In particular, we focus on the turbine blades, turbine vanes and the transition ducts of the combustion chambers. The existing monitoring techniques for these components, with their own particular advantages and disadvantages, are summarised in this review. In addition to the vibrational approach, tip timing technology is the most used technique for blade monitoring. Several sensor types are appropriate for the extreme conditions in a gas turbine, but besides tip timing, other technologies are also very promising for future NDT/SHM applications. For static parts, like turbine vanes and the transition ducts of the combustion chambers, different monitoring possibilities are identified and discussed.

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Section: Hot Gas Component Monitoringmentioning

confidence: 99%

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

Mevissen

Meo

2019

Sensors

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“…1.1.1.2.5 Thermal spray, Cold gas deposition and Sol-gel Thermal spray is a process which melts wire, rod or powder feedstock using a flame or plasma arc to produce molten droplets which are then accelerated onto a substrate to form a coating. It has been demonstrated to be capable of producing resolutions on the order of 100 microns [67,68]. It can be used to deposit metallic, polymeric or ceramic materials.…”

Section: Sshangmentioning

confidence: 99%

“…A short pulse laser of the order of femtoseconds or picoseconds can be used in a process that is termed ablation or spallation depending on the exact mechanism involved. A constant stream of pulses of a specific wavelength and frequency are incidented upon the material to be removed/deposited, the high peak energy strips off the electrons of the material under irradiation, the remaining positively charged lattice than expels and explodes [68,71,105,106]. This process allows efficient small area precision machining on almost any surface with virtually no heat affected zones, hence also referred to as cold machining [94,[107][108][109].…”

Section: Laser Ablationmentioning

confidence: 99%

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Shang¹,

Fearon²,

Wellburn³

et al. 2011

J. Phys. D: Appl. Phys.

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Declaration I hereby declare that this submission is my own work and that, to the best of my knowledge and belief, it contains no material previously published or written by another person nor material which to a substantial extent has been accepted for the award of any other degree or diploma of the University or other institute of higher learning, except where due acknowledgment has been made in the text: Signature Name: Shuo Shang Date: Friday 17 th August 2012 .

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“…It enables high throughput and cost‐effective ceramic coating over a large area on a wide variety of substrates. In addition to the applications in forming protective coatings, thermal spray process has been applied for the fabrication of some electronic components and sensor devices made of ceramics, including strain gauge, and humidity sensors . Research efforts have also been made for deposition of PZT‐based piezoelectric coatings by thermal spray .…”

Section: Introductionmentioning

confidence: 99%

Potassium sodium niobate (KNN)‐based lead‐free piezoelectric ceramic coatings on steel structure by thermal spray method

Chen

Tan

et al. 2018

J Am Ceram Soc

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For the first time, potassium sodium niobate (KNN)‐based lead‐free piezoelectric ceramic coating with strong piezoelectric response was fabricated on stainless steel substrates by thermal spray process, after introducing NiCrAlY and yttria‐stabilized zirconia (YSZ) intermediate layers. A large effective piezoelectric coefficient (d33) of 125 pm/V was obtained with the thermal‐sprayed KNN‐based ceramic coating on the steel substrates. The mechanisms of improving the structure and enhancing the properties of the KNN‐based piezoelectric ceramic coatings by introducing the intermediate layers were analyzed. Ultrasonic transducers were designed and fabricated from the KNN‐based coatings directly formed on a steel plate structure, and the feasibility for generation and detection of ultrasonic waves for structural health monitoring using the thermal‐sprayed lead‐free piezoelectric ceramic coating was demonstrated.

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Interdigital capacitive strain gauges fabricated by direct-write thermal spray and ultrafast laser micromachining

Cited by 51 publications

References 9 publications

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

A Review of NDT/Structural Health Monitoring Techniques for Hot Gas Components in Gas Turbines

A predictive thermal dynamic model for parameter generation in the laser assisted direct write process

Potassium sodium niobate (KNN)‐based lead‐free piezoelectric ceramic coatings on steel structure by thermal spray method

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