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Manufacturing and characterization of a modified four-quadrant position sensitive detector for out-door applications
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.ORCID iD: 0000-0002-3790-0729
2004 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 531, no 1-2, 134-139 p.Article in journal (Refereed) Published
Abstract [en]

Position sensing detectors (PSDs) are useful in many applications such as vibration, displacement and triangulation measurements. In this paper we have constructed a novel structure, which has higher inter-electrode resistance than a lateral effect PSD and is more robust to atmospheric turbulence than a conventional four-quadrant PSD (Nuclear Instruments and Methods in Physics Research A 466 (2001) 183). The detector structure is useful for applications with detector windows less than 0.5 x 0.5 mm(2), but the nonlinearity is the main concern for a detector of that size. Without any corrections for non-linearity the standard deviation of the error is 9 mum (2.2%). Using a simple analytical expression and a 2-d correction-function stored in a look-up table the positioning error is reduced to 6 (1.5%) and 2 (0.5%) mum, respectively.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2004. Vol. 531, no 1-2, 134-139 p.
Keyword [en]
4Q, PSD, detectors
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-361DOI: 10.1016/j.nima.2004.05.105ISI: 000224233400019OAI: oai:DiVA.org:miun-361DiVA: diva2:1977
Conference
5th International Workshop on Radiation Imaging Detectors, Sep 07-11, 2003, Riga, Latvia
Note
5th International Workshop on Radiation Imaging Detectors, Sep 07-11, 2003, Riga LatviaAvailable from: 2007-11-23 Created: 2007-11-23 Last updated: 2016-10-05Bibliographically approved
In thesis
1. Fabrication and Characterization of Photon Radiation Detectors
Open this publication in new window or tab >>Fabrication and Characterization of Photon Radiation Detectors
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis involves a study the fabrication and characterization of photon radiation detectors. The focus has been to develop and improve the performance of optical measurement systems, but also to reduce their cost. The work is based on the study of two types of detectors, the position sensitive detector and the thermal detector.

Infrared detectors are usually subcategorized into photonic detectors and thermal detectors. In the thermal detectors, heat generated from the incident infrared radiation is converted into an electrical output by some sensitive element. The basic structure of these detectors consists of a temperature sensitive element connected to a heat sink through a thermally isolating structure. Thin membranes of Silicon and Silicon nitride have been commonly used as thermally insulation between the heat sink and the sensitive elements. However, these materials suffer from relatively high thermal conductivity, which lowers the response of the detector. The fabrication of these membranes also requires rather advanced processing techniques and equipment. SU-8 is an epoxy based photoresist, which has low thermal conductivity and requires only standard photolithography. A new application of SU-8 as a self-supported membrane in a thermal detector is presented. This application is demonstrated by the fabrication and characterization of both an infrared sensitive thermopile and a bolometer detector. The bolometer consists of nickel resistances connected in a Wheatstone bridge configuration, whereas the thermopile uses serially interconnected Ti/Ni thermocouple junctions.

The position sensitive detectors include the lateral effect photodiodes and the quadrant detectors. Typical applications for these detectors are distance measurements and as centering devices. In the quadrant detectors, the active region consists of four pn-junctions separated by a narrow gap. The size of the active region in these detectors depends on the size of the light spot. In outdoor application, this spot size dependence degrades the performance of the four-quadrant detectors. In this thesis, a modified four-quadrant detector having the pn-junctions separated by a larger distance has been fabricated and characterized. By separating the pn-junctions the horizontal electric filed in the active region is removed, making the detector spot size insensitive.

Linearity of the lateral effect photodiodes depends on the uniformity of the resistive layer in the active region. The introduction of mechanical stress in an LPSD results in a resistance change mainly due to resistivity changes, and this affects the linearity of the detector. Measurements and simulations, where mechanical stress is applied to LPSDs are presented, and support this conclusion.

Place, publisher, year, edition, pages
Institutionen för informationsteknologi och medier, 2007
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 29
Keyword
Thermal Detectors, Posistion Sensitive Detectors
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-37 (URN)978-91-85317-72-1 (ISBN)
Presentation
2007-12-17, O102, O-Huset, Holmgatan 10, Sundsvall, 13:15
Opponent
Supervisors
Available from: 2007-11-23 Created: 2007-11-23 Last updated: 2011-04-07Bibliographically approved

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Mattsson, ClaesBertilsson, KentThungström, GöranNilsson, Hans-Erik
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Electrical Engineering, Electronic Engineering, Information Engineering

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