Planewave telescopes expert service unbeatable prices. Planewave thumb drive with software and documentation. The cdk14 is a lightweight carbonfiber truss design weighing less than 50lbs, with 3 cooling fans blowing air throughout the back of the telescope. Planewave instruments planewave store home 2242018. Comes with fused silica mirrors on all cdk and rc models planewave instruments brings a fully automated observatory class telescope to the market with the cdk700, a 0. Conical acoustic tubes physical audio signal processing. This playlist contains video tutorials of antenna design in cst. The cdk14 covers a 70 mm field of view without any field curvature, offaxis coma, or astigmatism. The software may be downloaded free for noncommercial use from figure 2. The largest planewave cdk optical tube assembly, the 24inch cdk optical tube assembly covers 70mm fields of view.
New fused silica mirror option available on all cdk and rc models the planewave instruments cdk17 is a 17 inch 0. He calls it a plane wave tube, but i have always called it a standing wave tube swt. Planewave instruments was founded in 2006 by richard hedrick and joseph haberman, two former telescope engineers at celestron, one of the largest telescope manufacturer worldwide. Planewaves infrared dallkirkham optical tube assembly is designed with coatings that are optimized to transmit in infrared wavelengths. Because many variations and results are possible, depending on the details of construction of plane wave tubes, this document discusses those variations for the purpose of encouraging. Plane wave tubes are used to provide a standard, frequencyinvariant load for the testing of compression drivers, so that all drivers may be evaluated on an equal basis.
Planewave instruments 17 inch cdk optical tube assembly. Mega industries rigid waveguide straight sections are available in a variety of waveguide sizes. The cdk corrected dallkirkham telescope is based on a new optical design developed by dave rowe. The end result at the image plane of the cdk design is no offaxis coma, no offaxis astigmatism, perfectly flat field no offaxis defocus. Deltat ready now the cdk24 comes standard with builtin dew heaters for both primary and secondary mirror. The cdk17 covers a 70 mm field of view without any field. The pw20rc has a dual carbonfiber truss design, with 3 cooling fans ejecting air from the back of the telescope. The conical acoustic tube is a onedimensional waveguide which propagates circular sections of spherical pressure waves in place of the plane wave which. A waveguide can be simply described as a metal pipe usually filled with air. Microwave course qwed software for electromagnetic design. The cdk24 has a dual truss design, with 3 cooling fans for the back of the primary mirror and 8 fans for the front surface of the primary mirror. Image source model with plane wave reflection coefficient.
The waves incident wave p i from the speaker transmit as plane waves in the tube. Vantage tools demonstration watch these video examples to learn more about software tools available on your vantage system arbitrary waveform tool shear wave. Pdf the proper use of plane wave models for muffler design. Richard hedrick brings over 21 years of telescope design experience. The fans are controlled by a switch on the optical tube or can be controlled by a computer if the optional efa kit is purchased. Pdf design of quarter wave tube for engine intake noise. Our pulse software then calculates the normal incident acoustic properties. Tarizzo and others published study on the use of plane wave tube as a base for a non destructive control instrument for frescoes damage assessment find, read and cite. Aes information document for acoustics planewave tubes design and practice 1 introduction 1.
Reproducibility experiments on measuring acoustical. The same popula tion of microbubbles was hence submitted to a succession of acoustic waves comparable to those used in molecular imaging with ultrasound. Ultrasound contrast plane wave imaging espci paris. Introducing the planewave instruments cdk24, a 24 inch 0. It is diffraction limited across a 20mm image circle at the focal plane. Commercial acoustic finite element software was used to numerically predict transmission loss of the proposed quarter wave tube and its corresponding simple. Normal incidence of a plane wave on the two lossless dielectric media boundary. This is a dallkirkham optical design with coatings that are optimized to transmit in infrared or ultra violet wavelengths. You can fashion a workable plane wave tube from a 4 length of plastic pipe the same diameter as the drivers exit. Planewave tubes design and practice audio engineering society. The focus tube runs on 5 bearings and is driven by a leadscrew so there is no chance of slipping. Hirschberg eindhoven university of technology 28 nov 2019 this is an extended and revised edition of iwde 9206. In many industries, muffler and silencer design is primarily accomplished via trial and error. Discussion of the anatomy of an electromagnetic plane wave.
This guarantees the user the best possible performance from the telescope. School of engineering, design and technology, university of bradford, bradford, bd7 1dp. The use of a plane wave tube pwt is standard practice for the testing of audio compression drivers, as the damped tube provides an acoustic impedance load for the driver that is similar to an infinitely long horn of the same throat diameter. Planewave instruments is proud to introduce the cdk 24. If you continue to browse our website, we shall assume that you accept them. We are combining the revolutionary cdk optical design that founded planewave instruments with an innovative directdrive altaz mount technology that sets a new standard for small observatory. Getting a product like the cdk into the hands of serious imagers and amateur astronomers has been a shared vision of hedrick and haberman for many years. The standard aes2 calls for the use of planewave tube measurement of highfrequency horn drivers. The cdk24 has a dual truss design, with 3 cooling fans for the back of the primary mirror and 4 fans for the front. The sound absorption coefficient can be measured by a standing wave tube impedance tube, and the process is schematically shown in figure 10. Designing acoustic comfort in aircraft and vehicle interiors, by selecting. Anechoic chambers are typically subject to a low frequency limit, governed by the length. The instrument weight is 140 lbs 64 kg and comes standard with a back plate retaining ring ready to accept the focuser of your choice. An acoustic duct or plane wave tube is a test facility used in acoustics.
Anechoic chambers are typically subject to a low frequency limit, governed by the length of the sound absorbing wedges employed to prevent reflections within the chamber. A shot of the akabak screen showing the electrical impedance of the standing wave tube driver. We also design and manufacture rigid rectangular tube. Test and measurement microphone calibration services are often required to be undertaken at frequencies where anechoic chambers cannot be used effectively.
This eseminar explains the concept of radar cross section, plane wave, and polarization of plane wave in cartesian and spherical coordinate system. The end result at the image plane of the cdk design is pinpoint stars from the center of the field of view out to the corner of the field of view. Developed by planewave, the cdk corrected dallkirkham is a revolutionary new telescope optical system that was designed to excel at imaging on large format ccd cameras while remaining an excellent instrument for visual use. The cdk17 has a dual carbonfiber truss design, with 3 cooling fans ejecting air from the back of the telescope. Pdf study on the use of plane wave tube as a base for a. From beginner telescopes to professional observatories, opt has it all. It starts with the basics of cst and then moves onto elementary operations of cst geometry manipulations. The impedance tube, or standing wave tube, guarantees highly reproducible testing conditions. Finally, it covers the basics and advanced stepbystep antenna design. You can use the specialized features to visualize acoustic fields and build virtual prototypes of devices or.
Uses of plane wave tubes for compression driver testing. Planewave instruments advanced astronomical devices. It accepts an optional dial indicator and can be upgraded with planewaves electronics focus accessory efa kit. Planewave instruments is committed to providing observatoryclass products for serious astronomers at an unprecedented value. The cdk17 has a dual carbonfiber truss design, with 3 cooling fans ejecting air from the back of the telescope, and 4 fans blowing across the boundary layer of the mirrors surface. This video was made for a junior electromagnetics course in electrical engineering at bucknell university, usa. Simulation software for analyzing acoustics and vibrations. On average 300320 clear nights per year and around 1. The goal of the design is to make an affordable astrographic telescope with a large enough imaging plane to take advantage of the large format ccd cameras of today. Checkout a video i made of obstech, a chilean remote telescope observatory. Their site is a perfect place for installing telescope equipment from planewave instruments for research and astrophotography. The cdk design will give you pinpoint stars from the center to the corner of the field of view.
Planewave instruments technologies optical, mechanical. The goal of the design is to make an affordable astrographic telescope with a large enough imaging plane to take advantage of. Operating the bisque paramount meii mount and the planewave cdk17 telescope. Drill a small hole for the measuring microphone a few inches from the driver, and stuff the far end of the pipe with a fair amount of loose wool or other damping material.
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