Transient Response of Thermal Paints for Use on Short-Duration Hypersonic Flight Tests

Neely, Andrew J.; Tracy, Philip J.

doi:10.2514/6.2006-8000

Cited by 7 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The performance of the filter is independent of the value of the temperature. The paint changes its color when exposed to temperature of different values and each color has a specific Hue, Intensity and Saturation (HIS) value 8–10 . The filter uses these values for filtering the image degraded because of exhaust deposition.…”

mentioning

confidence: 99%

“…(1) degraded image has been given as an input to the filter; (2) input RGB color image is to be converted into HIS image; (3) filter operates on HIS plane of the actual image; (4) filter checks whether the degraded image is having impulsive noise or not; (5) impulsive noise has been treated as black-andwhite pixels in the image; (6) once impulsive noise (salt & paper noise) is found, it tries to find out the black color pixel weights using weighting function in the degraded image and further tries to replace the original value of the original pixel in the image; (7) after complete operation of the filter it converts HIS image into RGB color image; (8) as an out put the universal filter gives denoised RGB color image; (9) the universal filter also produces histograms of RGB planes of degraded and denoised image.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Development and Application of a Universal Filter in Image Processing for Automatic Interpretation of Temperature-Sensing Thermal Paints

Bhalerao¹,

Pawar²,

Chandrashekhar

et al. 2011

Experimental Techniques

View full text Add to dashboard Cite

Machines like Internal Combustion Engines and gas turbines work on the principle of converting the heat energy into mechanical energy. Every effort is taken to elevate the operating temperature which in turn increases the output efficiency. However, the engine components cannot withstand such high temperatures and their life is seriously affected. The true gradient of the temperature to which these engine components are exposed is a wealth of knowledge for an engine designer. Conventional thermometry has got many limitations from measuring and mounting point of view and is unable to give the exact thermal gradient. Advancement in thermal mapping technique is required to enhance the development of these components. Comparatively thermal paints provide a better alternative to be used as temperature sensors. These paints change their color permanently when exposed to temperature. A proper calibration and automatic interpretation of these paints using digital image processing gives a reliable thermal contour. During the engine testing the carbon exhaust from the engine blackens the color of the thermal paint applied on the various components as it flows across it creating an obstacle in the color pattern (temperature) recognition. This article highlights the efforts taken in development and application of a filter which removes the effect of the carbon soot to denoise the degraded image and recover the original image to get the required temperature profile.

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

Development and Application of a Universal Filter in Image Processing for Automatic Interpretation of Temperature-Sensing Thermal Paints

Bhalerao¹,

Pawar²,

Chandrashekhar

et al. 2011

Experimental Techniques

View full text Add to dashboard Cite

show abstract

Study on Temperature Indicating Paint for Surface Temperature Measurement—A Review

Rupesh

Prakasajothi

Chandrasekhar

et al. 2018

Lecture Notes in Mechanical Engineering

View full text Add to dashboard Cite

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Yule

Zaghari

Harris

et al. 2021

Meas. Sci. Technol.

View full text Add to dashboard Cite

Turbine blades and nozzle guide vanes (NGVs) are operated at extreme temperatures in order to maximise thermal efficiency and power output of an engine. In this paper the suitability of existing temperature monitoring systems for turbine blades and nozzle guide vanes are reviewed. Both offline and online methods are presented and their advantages and disadvantages are examined. The use of offline systems is well established but their online equivalents are difficult to implement because of the limited access to components. There is the need for an improved sensor that is capable of measuring temperature in real time with minimum interference to the operating conditions of the engine, allowing operating temperatures to be increased to the limits of the components and maximising efficiency. Acoustic monitoring techniques are already used for a large number of structural health monitoring applications and have the potential to be adapted for use in temperature monitoring for turbine blades and NGVs. High temperatures severely affect the response of ultrasonic transducers. However, waveguides and buffer rods can be used to distance transducers from extreme conditions, while piezoelectric materials such as Yttrium Calcium Oxyborate single crystals and Aluminum Nitride have been developed for use at high temperatures. A new monitoring approach based on ultrasonic guided waves is introduced in this paper. The geometry of turbine blades and NGVs allows Lamb waves to propagate through their structure, and the presence of numerous cooling holes will produce acoustic reflections that can be utilised for monitoring temperature at a number of locations. The dispersive nature of Lamb waves makes their analysis difficult; however, wave velocity in dispersive regions is particularly sensitive to changes in temperature and could be utilised for monitoring purposes. The proposed method has the potential to provide high resolution and accuracy, fast response times, and the ability to place sensors outside of the gas path. Further research is required to develop a monitoring system based on the use of guided waves in extreme environments.

show abstract

Transient Response of Thermal Paints for Use on Short-Duration Hypersonic Flight Tests

Cited by 7 publications

References 16 publications

Development and Application of a Universal Filter in Image Processing for Automatic Interpretation of Temperature-Sensing Thermal Paints

Development and Application of a Universal Filter in Image Processing for Automatic Interpretation of Temperature-Sensing Thermal Paints

Study on Temperature Indicating Paint for Surface Temperature Measurement—A Review

Surface temperature condition monitoring methods for aerospace turbomachinery: exploring the use of ultrasonic guided waves

Contact Info

Product

Resources

About