Applications Of Spectroscopy – Plasma Monitoring, Wirebonding And More

The essential feature of active thermography is the targeted supply of energy to the test object. A temporal and spatial characteristic heat flow results depending on the geometry and thermal properties of the test subjects. Its progression on the surface of the test object is captured by a thermographic camera.

• Quality assurance for bonded, welded, soldered and other joints by means of cavity detections (e.g. on vehicle interior parts) 
• Detection of material defects in composites and cracks in metals
• Quality assurance of intermediate products (e.g. layered compounds)
• Localisation of defects in joints such as cavities, defective welding seams/points
• Assessment of thermal cutting and injection processes
• Testing of metallic and non-metallic materials/material compounds
• Tests of internal structures, such as fractures or impacts in honeycomb lightweight constructions

The versatile application options of active thermography require an elaborate configuration of every single inspection system. InfraTec offers a wide variety of necessary components along with a modular system architecture. The high-resolution cameras, efficient control and evaluation software as well as the continuously operable excitation sources and controllers are interchangeable within the system and therefore allow a flexible adaptation to upcoming requirements.

Applications of Active Thermography:

• Detection of layer structures, delaminations and inserts in plastics, for instance of wind turbines or CFRPs of the automotive and aerospace industry.
• Investigation of interior structures, for instance of breakage or impacts on Honeycomb lightweight constructions.
• Recognition of deeper material deficiencies, such as blowholes or ruptured laser welding seams.

High-speed imaging service for wire bonding inspection. Help to capture Common Causes of Wire Bonding Failures. Looping Problems, Bond Placement/Geometry Problems and other Bonding Site/Substrate Issues.

Wire bonding is a very important process in wafer packaging. The accuracy of this process will determine the packaging quality of the final product. Every single unit (chip) sawed from a wafer manufactured by a semiconductor company is sent for bonding before packaging.The bonding machine picks up one chip and places it onto the substrate and then links the bond pad to its corresponding lead using the gold wire continuously. After the wire bonding process, the dam glob process is continued to protect the chip and the wire from damage. 

Introduction: Laser hair removal needs an accurate understanding of tissue structure and chromophores content in order to optimize the selection of laser irradiation parameters. None of the optimized laser therapy might lead to side effects in skin tissue such as severe erythema, burn, scar etc. Therefore, guidance by a noninvasive real-time diagnostic method like optical spectroscopy technique is beneficial. The purpose of this survey is to analysis the skin hemoglobin spectrum quantitatively before and after hair removal laser irradiation to minimize the side effects of the procedure. Methods: To carry out a spectroscopy study, a halogen-tungsten light source was used in the wavelength region of 400-700 nm on an ocean optic device. The measurements were made on the facial area under identical conditions. Total 19 volunteers for laser hair removal by gentle laser Candela, ranging 14-49 years old, were included in the study. A total of 18 spectra were taken from each person, 9 spectra before hair removal as a reference and 9 subsequent spectra. Colorimetry was done for all acquired before and after spectrums using Origin software (version 8.6). Then, the erythema index derived for each spectrum. Statistical analysis of correlation and normalization in colorimetry data were done using data analysis by SPSS (version 16). Results: Spectra analysis, before and after optical reflectance spectrums in laser hair removal procedure, revealed the subpeak derivation, and concentration on special visible wavelength 510-610 nm. We studied the changes of skin chromophores absorption. The derived erythema index [E] and colorimetry parameters a*, b*, l* were compared and correlated statistically. There was a statistically considerable direct linear correlation between a* and E while inverse linear correlation was observed for l* and E and no correlation for b* and E. Conclusion: Diffuse reflectance spectroscopy showed its potency as an accurate, noninvasive real-time as complementary method for laser treatment to detect erythema as a complication of the method, in order to optimize the parameters based on the tissue characteristics in various candidates.

A modular spectroscopy setup based on the Ocean Optics HR2000+ high resolution spectrometer was used to monitor changes in argon plasma emission following the introduction of different gases to a plasma chamber. The measurements were done in a closed reaction chamber with the spectrometer coupled to a fiber and cosine corrector looking through a small window in the chamber. The measurements demonstrated the viability of modular spectroscopy components to acquire plasma emission spectra in real time from a plasma chamber. Plasma characteristics determined from these emission spectra can be used for monitoring and controlling plasma-based processes.

The innovation of a programmable homogeneous illumination pattern opens up several applications with increased performance. The technique has been tested on different variants of real-time illumination schemes. The following results illustrate that this technique gives exceptional results either in linear scan configuration or in full-field imaging acquisition. Moreover, the flexibility of Terahertz Imaging gives access to countless possibilities and applications.

The LIBS Laser-induced Breakdown Spectrometer is a detection system that permits real-time qualitative measurements of elements in solids, solutions and gases. This broadband, high-resolution system provides spectral analysis across a wide 200-980 nm range at a resolution of -0.1 nm (FWHM).

As population growth and limited arable land have strained the capacity to produce enough food, experts have stepped up efforts to explore and refine technical solutions that improve food production, quality and safety. In this application note, we describe how one such technology — NIR spectroscopy — helps to deliver objective data the food and agriculture industries are using to maximize quality and efficiency.