ISTFA 2014 Oral Presentation Acceptance

TeraView are pleased to announce that we have had a the paper 'Non-Destructive Fault Isolation in Advanced IC Packages' accepted for oral presentation at ISTFA 2014!

This years event will be the 40th International Symposium for Testing and Failure Analysis, and will be held in Houston, Texas, November 9-13 2014.

ISTFA is where you’ll find researchers, engineers, technicians and others who work on discrete components, dies, wafer fabrication, packages, board assembly and systems. They’re your customers.

• ISTFA is the only international venue devoted to the semiconductor, electronic sample preparation and imaging markets.
• ISTFA attracts attendees from all major global geographic areas.
• ISTFA offers a comprehensive practical and theoretical technical program that attracts the broadest mix of attendees.
• ISTFA continually expands topic areas to attract new and diverse audiences.
• ISTFA provides two full days of dedicated expo hours – make connections, build relationships, and generate sales.

For more information on ISTFA 2014 please visit: 
http://www2.asminternational.org/content/Events/istfa/index.jsp

Temperature evolution of dielectric response spectra of stillwellite-like glasses in the terahertz and infrared ranges

G. A. Komandin, O. E. Porodinkov, Yu. G. Goncharov, I. E. Spektor, L. D. Iskhakova, V. N. Sigaev, S. V. Lotarev, V. I. Torgashev

Abstract

The reflectance and transmittance spectra of the PrBGeO5 glass were measured in the terahertz and infrared ranges. At low temperatures, an increase in the permittivity and the appearance of narrow resonance-type lines in the terahertz range were revealed. The complex permittivity spectra were calculated from the Fresnel and Kramers-Kronig formulas.

This study was performed using TeraView's TPS spectra 3000 system. (TeraView, Cambridge, UK)

Full Article: http://link.springer.com/article/10.1134/S106378341406016X

EPIC Workshop on Intra-Operative Assessment of Tumor-Resection Margins

TeraVeiw are pleased to announce that we will be in attendance at the 'EPIC Workshop on Intra-Operative Assessment of Tumor-Resection Margins'!

The event will be hosted at the Daniel den Hoed Clinic, the Erasmus-University Medical Centre in Rotterdam, The Netherlands on the 2nd-3rd of July 2014.

TeraView's Alessia Portieri will be in attendance at the event and will be giving a talk on 'THz intra-operative imaging' at 1:30 pm on the 2nd.


Agenda:

The draft program is being finalized, it includes speakers from Europe, USA, medical doctors, research organizations, and industrial companies.

Who Should Attend:
The workshop will bring together medical doctors, researchers pursuing image-guided / optical spectroscopy-guided surgery, and small and large companies able to offer suitable optical technologies. As for all EPIC events, a list of participants will be shared in advance, including a picture of each attendee and a description of their organization. 

Objective:
The aim is to:

• develop a common understanding of the exact needs and requirements of surgeons,
• constraints and challenges,
• document a roadmap on what technologies are currently available and what approaches should preferably be followed to develop and introduce photonic technologies in the operating room.

For more information on the event visit: http://epic-assoc.com/contact-us/?at=95

Assessment of Enamel Demineralisation and Remineralisation using Terahertz Pulsed Imaging

D. CHURCHLEY¹, F. LIPPERT², A. BUTLER¹, A. PORTIERI³, and R.J.M. LYNCH¹, ¹GlaxoSmithKline Consumer Healthcare, Weybridge, England, ²Indiana University School of Dentistry, Indianapolis, IN, ³TeraView Ltd, Cambridge, England

Objective

Transverse micro-radiography (TMR) is the “gold standard” for measuring mineral changes in enamel; however, it is destructive in nature. The aim of this study was to compare Terahertz Pulsed Imaging (TPI), a non-destructive technique, with TMR for measuring mineral changes in enamel.

Methods 

Lesions with diverse mineral characteristics were created in bovine and human enamel blocks (n=48 per enamel type) using three demineralising systems (MeC, Carbopol C907 & HEC).  Specimens were assigned to two treatment groups (n=24 per enamel type per group): Group 1: remineralisation for 5 days (1.5mM CaCl₂.2H₂O, 0.9mM KH₂PO₄, 20mM HEPES and 130mM KCl) Group 2: demineralisation for 2 days (50mM acetic acid, 2.25mM CaCl₂.2H₂O, 1.35mM KH₂PO₄, 130mM KCl and 5ppm F).  Lesions were imaged using a TPI imaga 1000. Reflection data were used to generate lesion mineral profiles.   Lesions were also radiographed.  For both techniques the integrated mineral loss (ΔZ), lesion depth (L), change in mineral content (ΔM), and change in lesion depth (ΔL) were calculated. Pearson correlation coefficients were calculated for the combined data set as well as by enamel type, treatment and lesion type.

Results

The table shows the Pearson correlation coefficients.  There is generally a good association (Pearson coefficients ≥ 0.70) between TPI and TMR measurements for most variables.

Variable	Combined	Enamel Type		Treatment		Lesion Type
		Bovine	Human	Demin	Remin	MeC	C907	HEC
ΔZ(baseline)	0.66	0.69	0.65	0.59	0.81	0.28	0.74	0.47
ΔZ(post-treatment)	0.84	0.92	0.71	0.78	0.83	0.82	0.82	0.77
ΔM	0.75	0.84	0.58	0.55	0.52	0.80	0.72	0.70
L(baseline)	0.79	0.77	0.80	0.76	0.87	0.19	0.75	0.20
L(post-treatment)	0.88	0.95	0.77	0.75	0.73	0.97	0.87	0.78
ΔL	0.84	0.93	0.65	0.49	0.51	0.94	0.80	0.82

Conclusion 

Whilst these initial findings demonstrate that TPI could be a useful technique for the non-destructive assessment of enamel mineral changes; further evaluation is required.

This study was performed using TeraView's Imaga 1000 system (TeraView, Cambridge, UK) 

Full Article: https://iadr.confex.com/iadr/14iags/webprogram/Paper189313.html

TeraView Establishes Asian Presence

Press Release:

With a growing list of customers in Asia, TeraView has taken the step of establishing an initial base in the region. The first office is located in Seoul, and is intended to enhance the service, technical support and applications-specific expertise which TeraView offers its customers and commercial partners in the region.

The new office will be managed by Mr Bong Cho, who joined TeraView in 2012 after many years of experience working for companies active in the semiconductor inspection and non-destructive testing industries.

“These are exciting times at TeraView and there is significant untapped potential within the Asian market,” said Mr Cho. “We now have machines across Asia and increasingly with industrial partners. We need to ensure that we continue to provide these customers and partners with the best possible support. This office shows our commitment to our existing customers and commercial partners in Korea, and also to the wider region”.

Don Arnone, CEO TeraView said “Asia is increasingly important to TeraView, and we need to strongly support and expand our business in the region. We now have offices in North America, Europe and Asia, and continue to expand our customers support in all regions. “

About TeraView 

TeraView is the world’s first company devoted to the application of Terahertz light for spectroscopy and imaging. A spin out from Toshiba and Cambridge University in 2001 and employing circa 25 staff, TeraView has been developing its products across a number of applications and now has systems in over 20 countries. Headquartered in Cambridge, sales and support are available throughout Europe, North America and the Far East either directly or through a network of distributors. For more information on TeraView, visit www.teraview.com. 

Design and Experiment of a 220/420-GHz Gyrotron for Nondestructive Evaluation

Guan, X. ; Chen, C. ; Li, X. ; Yuan, X. ; Yan, Y. ; Fu, W. 

Abstract

We report the design and experiment of a 220/420-GHz gyrotron oscillator for nondestructive evaluation which operates at the fundamental near 220 GHz and the second harmonic near 420 GHz of the electron cyclotron resonance frequency. Through optimizing electron gun for both operation modes, the TE₂₆ mode at 423.1 GHz and the TE₀₃ mode at 221 GHz are observed at output powers up to 8 and 6 kW, respectively, by only changing the beam voltage at a magnetic field of 8.2 T. The experimental results are in reasonable agreement with the design and simulation. In addition, the measurements of potential operation modes with peak output power are also presented in this paper.

This study was performed using TeraView's TPS spectra 3000 system. (TeraView, Cambridge, UK)

Full Article: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6819820&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6819820

Terahertz radiation NDE of composite materials for wind turbine applications

Je-Woong Park, Kwang-Hee Im, In-Young Yang, Sun-Kyu Kim, Sung-Jun Kang, Young-Tae Cho, Jong-An Jung, David Kuei Hsu

Abstract

Nondestructive testing technique using T-ray (terahertz ray) has received more interest as a new capability tool in engineering application. So, T-ray time-domain spectroscopy was used for inspecting and evaluating physical property and defect characteristics in FRP composite materials for a use of wind energy. First of all, a general refraction mode and transmission mode was utilized for calculating a refractive index (n) based on the well-machined sample. In order to obtain the terahertz ray refractive index, a refractive mode and a transmission mode technique was defined for solving a refractive coefficient (n), with which refractive index of GFRP composites, balsa and epoxy for a use of wind turbine blades could be obtained. A method of wind turbine blade composites having one and two saw-cuts delaminations and some angles/directions was suggested based on the E-field vector. The time of flight in T-ray using evaluating a T-ray transmission mode agreed with that using T-ray time-domain spectroscopy with the wind turbine blade. Also, in CFRP composites, T-ray propagation is limited because the carbon fibers are blocking the T-ray. Therefore, we have analyzed difference between E-field vector in T-ray and the carbon fiber direction. Also, it was found that a T-ray time domain data in thick GFRP composite laminates seemed to show peaks with a regular spacing (Δt) which was obvious with the close relation between TOF and FFT.

This study was performed using TeraView's TPS spectra 3000 system. (TeraView, Cambridge, UK)

Full Article: http://link.springer.com/article/10.1007/s12541-014-0464-0

Detection of Melamine in Foods Using Terahertz Time-Domain Spectroscopy

Seung Hyun Baek, Heung Bin Lim, and Hyang Sook Chun

Abstract

The aim of this study was to investigate the feasibility of detecting melamine in foodstuffs using terahertz imaging. The terahertz (THz) spectra and images of melamine mixtures were obtained in the frequency range of 0.1–3 THz at room temperature using THz time-domain spectroscopy. Characteristic absorption peaks of melamine were found at 2, 2.26, and 2.6 THz, and these peaks showed the same frequencies in the different food matrices. At 2 THz, the THz images of melamine were dose-dependently distinguishable from those of food components with or without the packaging materials used. The calibration curve of melamine showed a regression coefficient (R2) of >0.913 and a detection limit of <13%. These results suggest that terahertz imaging has the potential to be used for the qualitative detection of melamine in food as a nondestructive analytical tool.

This study was performed using TeraView's TPS spectra 3000 system. (TeraView, Cambridge, UK)

Full Article: http://pubs.acs.org/doi/abs/10.1021/jf501170z

Terahertz and Raman spectra of non-centrosymmetrical organic molecular crystals

Monika Trzebiatowska-Gusowska, Edward F. Plinski, Jan Baran, Michal J. Walczakowski, Przemyslaw P. Jarzab, Kacper Nowak, Boguslaw Fuglewicz, Martin Mikulics, Norbert Palka, Mieczyslaw Szustakowski

Abstract

The terahertz waves have been applied to the spectroscopy of molecular crystals. The group based on hybrid organic–inorganic crystals like triglycine zinc chloride, triglycine sulphate, triglycine selenate, diglycine hydrobromide, diglycine hydrochloride, diglycine lithium nitrate, glycine lithium nitrate has been considered. The dispersion relation phonon–polariton have been shown between 10 cm−1 and 80 cm−1 for diglycine lithium nitrate, triglycine zinc chloride, and diglycine hydrobromide.

This study was performed using TeraView's TPS spectra 3000 system. (TeraView, Cambridge, UK)

Full Article: http://www.sciencedirect.com/science/article/pii/S0925346714001992