SOUND FIELD DECOMPOSITION USING SPHERICAL .

SOUND FIELD DECOMPOSITION USING SPHERICAL MICROPHONE ARRAYS Dmitry N. Zotkin, Ramani Duraiswami, and Nail A. Gumerov Perceptual Interfaces and Reality Lab, UMIACS, University of Maryland, College Park ABSTRACT Spherical microphone arrays offer a number of attractive properties such as direction-independent acoustic behavior and ability to re-

• Published in: international conference on acoustics, speech, and signal processing · 2008Authors: Dmitry N Zotkin · Ramani Duraiswami · Nail A GumerovAffiliation: University of Maryland College ParkAbout: Least squares · Microphone array[PDF]GET PRICE >>

Microlens Arrays - Thorlabs

The microlenses have a plano-convex shape and are arranged in a square grid with a lens pitch of 150 µm or 300 µm. The microlens arrays with a pitch of 150 µm have round lenslets, whereas the microlens arrays with a pitch of 300 µm have square lenslets, allowing for a fill factor of 96.7%.

Acoustical Spherical Array Processing Library - File ...

Nov 13, 2016 · Acoustical Spherical Array Processing Library. This is a collection MATLAB routines that perform array processing techniques on spatially transformed signals, commonly captured with a spherical microphone array. The routines fall into four main categories: 1. obtain spherical harmonic (SH) signals with broadband characteristics, as much as...

Spherical Microphone Array Beamforming | SpringerLink

Complementary studies presented progress in beamforming methods. This chapter reviews beamforming methods recently developed for spherical arrays, from the widely used delay-and-sum and Dolph-Chebyshev, to the more advanced optimal methods, typically performed in the spherical .

PRODUCTS

Spherical reflectors for gas analytical instruments – gold coated. Micro-mirror array for spaceborne geophysics research instrument package. Ellipsoidal light source optics for semiconductor inspection equipment. 1 mm diameter aspheric polymer optics for surgical tools. Aspheric lenses for retina surgery.

Analysis and design of spherical microphone arrays - IEEE ...

Dec 20, 2004 · Abstract: Spherical microphone arrays have been recently studied for sound-field recordings, beamforming, and sound-field analysis which use spherical harmonics in the design. Although the microphone arrays and the associated algorithms were presented, no comprehensive theoretical analysis of performance was provided.

Optical Lenses - Thorlabs

Thorlabs' extensive line of optical lenses includes spherical, achromatic, aspheric, and cylindrical lenses, both with and without antireflection coatings deposited on the surfaces. Our optical lenses are offered with a variety of substrates, including N-BK7, UV fused silica, calcium fluoride, magnesium fluoride, zinc selenide, germanium, and silicon.

Precision Aspheric Lenses

Custom Molded Glass Aspheric Lenses. Rochester Precision Optics offers custom molded glass aspheric lenses from less than 1mm to 60mm diameters. Our process is not limited to typical moldable glasses, the process can utilize a wide range of optical grade glass types allowing the designer more flexibility.

Spherical Microphone Arrays - UMIACS

Hemispherical Microphone Array • In a conference table, the table surface is usually rigid and inevitably creates acoustic images. • Given a specified number of microphones and a sphere of given radius, a hemispherical array will have a denser microphone arrangement, thereby allowing for analysis of a wider frequency range.

Microlens Arrays - INGENERIC

Spherical and aspherical microlens arrays. Major applications for lens arrays with spherical or aspherical curvature are imaging and illumination as well as the effective collimation of laser light. Lens apertures from 0.2 mm up to 3.0 mm are possible. High filling factors and minimum dead zones allow unique beam shaping results. Most spherical...

Design and Development of Glass Array Aspherical Lens ...

spherical aberration is a problem [1-2]. This limits the technique to the production of small quantities. Mass production calls for a different approach. Precision glass molding process is adopted for mass production of aspheric lens, glass array lens and diffractive optical elements which are difficult to be manufactured by

Comparing Modeled and Measurement-Based Spherical .

COMPARING MODELED AND MEASUREMENT-BASED SPHERICAL HARMONIC ENCODING FILTERS FOR SPHERICAL MICROPHONE ARRAYS Archontis Politis Dept. of Signal Processing and Acoustics Aalto University, FI-02150, Finland [email protected]fi Hannes Gamper Microsoft Research Redmond, WA 98052, USA [email protected] ABSTRACT

Lens Arrays | Micro-lens arrays | spherical aspheric ...

Micro-lens arrays : A micro-lens is a lens with a diameter less than 1mm. The lenses can by spherical, aspheric, cylindrical, and plane with positive power. They are used to couple light to optical fibres. These lenses are usually arranged in, for example, a square array. These micro-lens arrays are used,...

Microlens Arrays | Microlens Array - Holographix LLC

Array size: areas up to 600 mm x 350 mm: Individual lenslet size: <1um to >1mm: Individual lenslet profile: refractive or diffractive, aspheric, conic, or anamorphic: Individual lenslet sag: <1 µm to >100 µm: Substrate material: most glass and plastic types: Array distribution: square, hexagonal, or custom: Fill factor: up to 99%: Optical transmission:

Aspherical lens element - All industrial manufacturers ...

Aspherical lenses are designed to reduce spherical aberration. Complex - lens systems designed for compensation of spherical aberration can often be replaced with a single aspheric lense. We offer ...

SPEAKER TRACKING WITH SPHERICAL MICROPHONE ARRAYS

SPEAKER TRACKING WITH SPHERICAL MICROPHONE ARRAYS John McDonough 1, Kenichi Kumatani;2, Takayuki Arakawa3, Kazumasa Yamamoto4, Bhiksha Raj1 1Carnegie Mellon University, Pittsburgh, PA, USA 2Spansion, Inc., Sunnyvale, CA, USA 3NEC Corporation, Kawasaki-shi, Japan 4Toyohashi University of Technology, Toyohashi-shi, Japan ABSTRACT In prior work, we investigated the application of a spherical .

• Published in: international conference on acoustics, speech, and signal processing · 2013Authors: John W Mcdonough · Kenichi Kumatani · Takayuki Arakawa · Kazumasa Yamamoto · B.Affiliation: Carnegie Mellon University · Nec · Toyohashi University of TechnologyAbout: Loudspeaker · Kalman filter · Speaker recognitionGET PRICE >>

SUSS MicroOptics Product Portfolio

Lens profile Spherical, aspherical (DOE / Fresnel lenses also available) Arrays Linear, quadratic, hexagonal, custom Number of lenses per array According to customer requirements AR coating UV, VIS, NIR - front side, back side, against air or glue REFOCUSING FOCUSING COLLIMATING 8

Latex molds spherical-micromirror arrays | Laser Focus World

A spherical-micromirror array with a 10-µm period was fabricated from platinum (Pt; left); a similar array with a 5-µm period was made from gold (Au; right). In this .

modeling - Creating a spherical array - Blender Stack Exchange

Creating a spherical array. Ask Question Asked 4 years, 4 months ago. Active 4 years, 4 months ago. Viewed 3k times 8. 3 $begingroup$ Keep in mind that I am almost completely new to blender. I was wondering how to create a spherical array. I have Googled and Googled, but I can only find ways to make circular arrays (two dimensional arrays).

LENSLET ARRAYS | Moulded Optics | New Products | Jun ...

Available in rectangular, square or round shapes and in sizes up to 80 mm across, they have a center thickness of 3 mm, with individual spherical, aspherical, cylindrical and unusually configured decentered lenslet array cells. The array's first surface is molded, and its .

Microlens Arrays - PowerPhotonic

Microlens Arrays PowerPhotonic offers a wide range of standard and custom microlens arrays, with high uniformity of RoC, conic constant and pitch. All lens parameters can be customer-specified: spherical, aspherical, astigmatic or acylindrical lenses can be arranged on .

Lens - Wikipedia

Spherical aberration causes beams parallel to, but distant from, the lens axis to be focused in a slightly different place than beams close to the axis. This manifests itself as a blurring of the image. Lenses in which closer-to-ideal, non-spherical surfaces are used are called aspheric lenses. These were formerly complex to make and often extremely expensive, but advances in technology have greatly reduced the .

Spherical, aspherical and freeform lenses and micro-lens ...

Spherical, aspherical and freeform lenses and micro-lens arrays. We are a major player in the development of optical components, providing added value whatever the activity sector: automotive, signalling, 3D animation, industrial and medical lighting, high tech, etc.

All About Aspheric Lenses | Edmund Optics

Spherical aberration is inherent in the basic shape of a spherical surface and is independent of alignment or manufacturing errors; in other words, a perfectly designed and manufactured spherical lens will still inherently exhibit spherical aberration. An aspheric lens can be designed to minimize aberration by adjusting the conic constant and aspheric coefficients of the curved surface of the lens.

Spherical Arrays - Design Considerations | B. Tomasic ...

Spherical Arrays - Design Considerations. ... But, a spherical array is a better option because it maintains near uniform directivity for all scan angles [8], [9]. However, considering the ...

Spherical and anspherical lenses - IMOS Gubela

makes it possible to supply aspherical lenses, which are very sophisticated in terms of technical production, at the same price as spherical lenses. The advantage accruing to the customer is that they can focus purely on technical aspects during the selection process. Aspherical variants generally facilitate much more precisely directed illumination.

FABRICATION OF MICRO ASPHERICAL LENS ARRAY USING .

rt for convex and concave spherical lens respectively. Rls is the radius of the cross section of the lens surface of cutting radial direction and rt is the diamond tool radius. Since cross sections without lens center have different aspherical surface profile, micro lens .

Design and manufacture of micro-optical arrays using 3D ...

Using this technique, master shapes can be produced for replication of micro-lens arrays of either epoxy-on-glass or monolthic glass types. A machine tool path programme has been developed on the machine software platform DIFFSYS, allowing the production of spherical, aspherical and toric arrays.

MICROLENS ARRAYS

spherical and aspherical microlens arrays Major applications for lens arrays with spherical or aspherical curvature are imaging and illumination as well as the effective collimation of laser light.

Spherical aberration - Wikipedia

Spherical aberration. Spherical aberration is an optical effect observed in an optical device ( lens, mirror, etc.) that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike close to the centre.