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surface-excited thermography

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110219
EISBN: 978-1-62708-247-1
... by a power source. The stimulation, however, is repeated at a fixed repetition rate, which is referred to as the lock-in frequency. The periodic excitation of a resistive defect will lead to a periodically pulsating hot-spot. Figure 2 Principle of lock-in thermography (LIT). At each pixel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110209
EISBN: 978-1-62708-247-1
... temperature is 36.7 °C), (b) I = 100 mA (actual surface temperature is 52.0 °C), (c) sample coated with black paint, I = 100 mA (actual surface temperature is 55.4 °C). Thermal infrared (IR) microscopy has experienced a decisive technical improvement by the application of Lock-in Thermography (LIT) [7...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110550
EISBN: 978-1-62708-247-1
... cause. Lock-in thermography (LIT) works on a principle of introducing external periodic sinusoidal thermal excitation in the location of interest and analyzing the resulting local temperatures on the surface of interest. This is done when the DUT is powered up based on the IV (Current-Voltage...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910475
EISBN: 978-1-62708-250-1
... of infrared radiation emitted by the target (Thermography). Surface and/or volumetric temperature over a large temperature range (−20 to 2000 °C, or −5 to 3630 °F, or higher). Rapid and relatively simple techniques. Infrared radiation techniques can detect temperature beneath cladding etc. Good temperature...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030360
EISBN: 978-1-62708-282-2
... it possible to test material for corrosion or defects on the opposite surface to where there is access. These techniques have the advantage that they avoid the need to enter the equipment for internal examination. For pressure vessels and tanks there is a reduction of risks to personnel entering confined...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2019
DOI: 10.31399/asm.tb.mfadr7.t91110447
EISBN: 978-1-62708-247-1
... Abstract There are several analytical methods available that can be used in-line on whole wafers as well as off-line on de-processed products that are returned from the field. These techniques are surface analytical techniques that can be used to characterize the bulk of the material. The main...