Change search
ReferencesLink to record
Permanent link

Direct link
Low-cost far infrared bolometer camera for automotive use
Show others and affiliations
2007 (English)In: P SOC PHOTO-OPT INSTRUM ENG, 2007, Vol. 6542, 5421-5421 p.Conference paper (Refereed)
Abstract [en]

A new low-cost long-wavelength infrared bolometer camera system is under development. It is designed for use with an automatic vision algorithm system as a sensor to detect vulnerable road users in traffic. Looking 15 in in front of the vehicle it can in case of an unavoidable impact activate a brake assist system or other deployable protection system. To achieve our cost target below epsilon 100 for the sensor system we evaluate the required performance and can reduce the sensitivity to 150 mK and pixel resolution to 80 x 30. We address all the main cost drivers as sensor size and production yield along with vacuum packaging, optical components and large volume manufacturing technologies. The detector array is based on a new type of high performance thermistor material. Very thin Si/SiGe single crystal multi-layers are grown epitaxially. Due to the resulting valence barriers a high temperature coefficient of resistance is achieved (3.3%/K). Simultaneously, the high quality crystalline material provides very low 1/f-noise characteristics and uniform material properties. The thermistor material is transferred from the original substrate wafer to the read-out circuit using adhesive wafer bonding and subsequent thinning. Bolometer arrays can then be fabricated using industry standard MEMS process and materials. The inherently good detector performance allows us to reduce the vacuum requirement and we can implement wafer level vacuum packaging technology used in established automotive sensor fabrication. The optical design is reduced to a single lens camera. We develop a low cost molding process using a novel chalcogenide glass (GASIR (R) 3) and integrate anti-reflective and anti-erosion properties using diamond like carbon coating.

Place, publisher, year, edition, pages
2007. Vol. 6542, 5421-5421 p.
Keyword [en]
automotive, bolometer, SiGe, MEMS, optics, infrared
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:kth:diva-24769DOI: 10.1117/12.721272ISI: 000249892700055ScopusID: 2-s2.0-35648988571ISBN: 978-0-8194-6664-8OAI: diva2:355943
Conference on Infrared Technology and Applications XXXIII Orlando, FL, APR 09-13, 2007
QC 20101008Available from: 2010-10-08 Created: 2010-09-27 Last updated: 2011-11-29Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Niklaus, FrankStemme, Göran
By organisation
Microsystem Technology
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 70 hits
ReferencesLink to record
Permanent link

Direct link