High precision optical angle measuring method applicable in standard CMOS technology

Koch, Christian; Oehm, J.; Gornik, Andreas

doi:10.1109/esscirc.2009.5325982

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…One such technique [16] -the track and tune image sensor, was based on using the metal shading based [17], [18] quadrature pixel cluster [19] in order to achieve a high spatial resolution (13 pixels for bi-directional angle detection) while enabling a wide angular resolution (±35 • ). The essence of the trackand-tune technique was to use a group of pixels with low sensitivity, but high linearity (quadrature pixel cluster) along with another group of pixels with high sensitivity, but low linearity (Talbot pixels) to determine the local incidence angle.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Based Angle Sensitive Pixels for Light Field Image Sensors With High Spatio-Angular Resolution

Varghese

Chen

2016

IEEE Sensors J.

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This paper presents a new angle sensitive pixel design for use in light field image sensors. This new pixel, referred to as the macro-pixel, is comprised of seven sub-pixels, and can determine the light angles in the range from −45°to +45°. The range of detectable angles is only limited by the presence of routing metals in the vicinity of the pixels. Each macro-pixel captures incident light angle through the aid of sub-wavelength metallic structures at its focal plane. Unlike previous designs that needed a large number of sub-pixels to determine a limited range of the incident angles, the presented design requires only half as many sub-pixels while offering a comparatively large angle detection range.Index Terms-Polarization pixels, angle detection, quadrature pixel cluster, light field image sensor, linear angle sensitive pixels, Talbot pixels.

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Section: Introductionmentioning

confidence: 99%

Polarization-Based Angle Sensitive Pixels for Light Field Image Sensors With High Spatio-Angular Resolution

Varghese

Chen

2016

IEEE Sensors J.

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“…Koch et al engineered a sensor for the continuous detection of incoming light angles, fabricated using a standard 250 nm CMOS technology [158]. It employs a simplified design with just two diodes; one shaded and one unshaded.…”

Section: Angular Measurements Of Incident Lightmentioning

confidence: 99%

A Review of Optical Sensors in CMOS

Gounella,

Ferreira,

Amorim

et al. 2024

Electronics

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This paper presents an overview of silicon-based optical sensors for the measurement of light in the visible spectrum range. The review is focused on sensors based on CMOS (complementary metal-oxide semiconductor) technology due to the high availability, low cost, ease of prototyping, and well-established fabrication processes. CMOS technology allows integration with the CMOS readout and control electronics in the same microdevice, featuring high-volume fabrication with high-reproducibility and low-cost. This review starts with an explanation of the phenomena behind opto-electronic transduction. It also presents and describes the most common components responsible for optical transduction, readout electronics, and their main characteristics. This review finishes with the presentation of selected applications to grasp where and how these sensors can be used.

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“…We propose a simple pixel structure -one that uses the metal shading principle [10] to capture the light angle. This technique takes advantage of the complementary response produced by a pair of adjacent photodiodes when they are partially shaded by a metal.…”

Section: Introductionmentioning

confidence: 99%

Linear angle sensitive pixels for 4D light field capture

Varghese¹,

Qian²,

Chen³

et al. 2013

2013 International SoC Design Conference (ISOCC)

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In this paper we present the design of an image sensor pixel which produces a linear response proportional to the incident light angle. Unlike conventional pixels, the proposed pixel encodes incident angles in terms of linear intensity variations. A set of four pixels can distinguish between incident light angles along both the vertical and horizontal directions. This coarse linear angle information can be combined with the precise nonlinear Talbot effect based pixel response to deduce the exact incident angle. This technique greatly reduces the complexity of the Talbot effect based technique. Fabricated in a 65 nm GlobalFoundries mixed-signal CMOS process, the sensor can distinguish between angles in the range from -35 • to +35 • .

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High precision optical angle measuring method applicable in standard CMOS technology

Cited by 9 publications

References 5 publications

Polarization-Based Angle Sensitive Pixels for Light Field Image Sensors With High Spatio-Angular Resolution

Polarization-Based Angle Sensitive Pixels for Light Field Image Sensors With High Spatio-Angular Resolution

A Review of Optical Sensors in CMOS

Linear angle sensitive pixels for 4D light field capture

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