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High-frequency heterodyne lock-in thermography (HeLIT): A highly sensitive method to detect early caries
- Source :
- Applied Physics Letters. 109:141904
- Publication Year :
- 2016
- Publisher :
- AIP Publishing, 2016.
-
Abstract
- In this letter, a nonlinear photothermal characteristic of dental tissues has been verified by photothermal radiometry at a given frequency with changing of the laser intensity. Subsequently, the high-frequency heterodyne lock-in thermography (HeLIT) scheme has been introduced to overcome shortages of the low infrared camera frame rate and the poor signal-noise ratio. The smooth surface tooth was artificially demineralized at a different time, and then it was detected by HeLIT, Results illustrated that the phase delay increases with the extension of the demineralized treatment time. The comparison experiments between HeLIT and the homodyne lock-in thermography for detecting artificial caries were carried out. Experimental results illustrated that the HeLIT has the merits of high sensitivity and specificity in detecting early caries.
- Subjects :
- Heterodyne
Materials science
Physics and Astronomy (miscellaneous)
business.industry
02 engineering and technology
Photothermal therapy
021001 nanoscience & nanotechnology
Frame rate
01 natural sciences
010309 optics
Direct-conversion receiver
Optics
0103 physical sciences
Thermography
Sensitivity (control systems)
Heterodyne detection
0210 nano-technology
business
Group delay and phase delay
Subjects
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 109
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........eb468a05f6bc7af5ef98c7e0d98a44b0