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Search Results for collimator
1
Book Chapter
Series: AIPP Books, Principles
Published: March 2023
10.1063/9780735424395_007
EISBN: 978-0-7354-2439-5
ISBN: 978-0-7354-2436-4
... using collimating lenses and sometimes Fourier transform lens to reduce diffraction effects ( Stepanovsky, 2019 ). Some applications such as free space ring resonators also use them for achieving re-configurability. Torsion ( Lee et al., 1999 ), free rotation ( Lin et al., 2000...
Book
Series: AIPP Books, Principles
Published: March 2023
10.1063/9780735424395
EISBN: 978-0-7354-2439-5
ISBN: 978-0-7354-2436-4
Book Chapter
Series: AIPP Books, Methods
Published: December 2022
10.1063/9780735425422_004
EISBN: 978-0-7354-2542-2
ISBN: 978-0-7354-2540-8
... and quantitative phase analysis. The peak shape indicates the role of sample broadening in microstrains and crystallite size. Principle and instrumentation Principles of XRD The x rays are produced by a cathode-ray tube, which is then filtered to generate monochromatic radiation, collimated to focus, and pointed...
Book
Series: AIPP Books, Methods
Published: December 2022
10.1063/9780735425422
EISBN: 978-0-7354-2542-2
ISBN: 978-0-7354-2540-8
Book Chapter
Series: AIPP Books, Principles
Published: May 2022
10.1063/9780735424678_002
EISBN: 978-0-7354-2467-8
ISBN: 978-0-7354-2464-7
... wavelength. Focusing: When light illuminates a water droplet on glass, one can see the convergence of light pattern behind it. Ideal focusing converges a beam of light rays to intersect at the same point in space. For a collimated beam of light, parabolic mirrors can reflect parallel rays...
Book Chapter
Series: AIPP Books, Principles
Published: May 2022
10.1063/9780735424678_006
EISBN: 978-0-7354-2467-8
ISBN: 978-0-7354-2464-7
...The generation of nonlinear optical contrast relies on a tight focusing of femtosecond laser pulses. For a collimated light with 1-µm wavelength, the focused beam waist w0 after a NA = 1.2 water immersion objective is about 0.5 µm. This 1/e beam radius...
Book Chapter
Series: AIPP Books, Principles
Published: May 2022
10.1063/9780735424517_001
EISBN: 978-0-7354-2451-7
ISBN: 978-0-7354-2448-7
... the dimension of the objects through which the light passes is much larger than the wavelength of the light, we can consider the light to be a ray and employ simple ray optics to align/collimate the beam. Now, if we introduce a pinhole or slit that has a dimension close to the wavelength of the light, we need...
Book Chapter
Series: AIPP Books, Professional
Published: May 2022
10.1063/9780735424234_006
EISBN: 978-0-7354-2423-4
ISBN: 978-0-7354-2420-3
... research center is developing a system for imaging the shape of the back of the eye for use as a map for corrective surgery. The technique requires highly collimated laser light of at least 1.0 cm diameter given that dilated pupils can be 8 mm or more in diameter. To meet the specifications...
Book
Series: AIPP Books, Principles
Published: May 2022
10.1063/9780735424678
EISBN: 978-0-7354-2467-8
ISBN: 978-0-7354-2464-7
Book
Series: AIPP Books, Principles
Published: May 2022
10.1063/9780735424517
EISBN: 978-0-7354-2451-7
ISBN: 978-0-7354-2448-7
Book
Series: AIPP Books, Professional
Published: May 2022
10.1063/9780735424234
EISBN: 978-0-7354-2423-4
ISBN: 978-0-7354-2420-3
Images
in Quantitative Imaging in Radiation Treatment Planning
> Quantitative Imaging in MedicineApplications and Clinical Translation
Published: November 2021
to hit the heavy alloy target and hence create photons, primary collimators, a flattening filter to make the photon beam more even across the field and secondary collimators to shape the beam for treatment. The result is a shaped photon beam for treatment. More about this image found in A schematic image of a linear accelerator (linac). Note the high energy pow...
Images
Published: December 2021
FIG. 7.5 Schematic of a G2 OR-PAM system: ND: neutral density filter; BS: beam splitter; ConL: condenser lens; CorL: correction lens; RAP: right-angle prism; RhP: rhomboid prism; PD: photodiode; FC: fiber collimator; SMF: single-mode fiber; CCD: charge-coupled device; SO: silicone oil; US More about this image found in Schematic of a G2 OR-PAM system: ND: neutral density filter; BS: beam split...
Images
in Optical Coherence Elastography Imaging Probes
> Optical Coherence ElastographyImaging Tissue Mechanics on the Micro-Scale
Published: December 2021
, A. B. et al., J. Biomed. Opt. 23 , 105006 (2018). Copyright 2018 SPIE. (b) Endoscopic OCE imaging probe for imaging vascular lesions. (i) Overview of acoustic radiation force impulse (ARFI) OCE system setup. C: collimator; L: lens; A: attenuator; M: mirror; G: grating; MS: mechanical stage More about this image found in Examples of endoscopic OCE imaging probes. (a) Integrated ARF OCE imaging p...
Book Chapter
Series: AIPP Books, Principles
Published: November 2021
10.1063/9780735423558_005
EISBN: 978-0-7354-2355-8
ISBN: 978-0-7354-2352-7
... then bombard a tungsten target to produce x rays. The x rays are then collimated to a defined point for clinical application to a patient. The number of electrons at the tungsten target can be adjusted to alter the rate of x-ray production (Fig. 5.1 ). FIG. 5.1 A schematic image of a linear accelerator...
Book Chapter
Series: AIPP Books, Methods
Published: December 2021
10.1063/9780735423794_007
EISBN: 978-0-7354-2379-4
ISBN: 978-0-7354-2376-3
...-PAM employs a weakly focused or collimated light beam, as shown in Fig. 7.2(b) . The optical beam spot of AR-PAM is larger than the acoustic focal spot. As a result, the lateral resolution of AR-PAM is acoustically determined by the acoustic focal spot size as follows ( Yao and Wang, 2013 ): (7.5...
Book Chapter
Series: AIPP Books, Methods
Published: December 2021
10.1063/9780735423664_010
EISBN: 978-0-7354-2366-4
ISBN: 978-0-7354-2364-0
.... Opt. 23 , 105006 (2018). Copyright 2018 SPIE. (b) Endoscopic OCE imaging probe for imaging vascular lesions. (i) Overview of acoustic radiation force impulse (ARFI) OCE system setup. C: collimator; L: lens; A: attenuator; M: mirror; G: grating; MS: mechanical stage; RFA: radio frequency amplifier; P...
Book Chapter
Series: AIPP Books, Methods
Published: December 2021
10.1063/9780735423794_002
EISBN: 978-0-7354-2379-4
ISBN: 978-0-7354-2376-3
... transport. The details of Monte Carlo simulations are described elsewhere ( Wang and Jacques, 1992 ; Wang et al., 1995 ; and Jacques, 2011 ). Diffusion theory When light is first delivered into a tissue as a collimated beam at a single point, the initial gradients of light distribution are steep. However...
Book Chapter
Series: AIPP Books, Methods
Published: December 2021
10.1063/9780735423794_004
EISBN: 978-0-7354-2379-4
ISBN: 978-0-7354-2376-3
..., multi-mode optical fibers, and the Powell lens. In these approaches, only the aspheric optics based on beam refraction for intensity redistribution ( Benítez, 2004 ) can output a collimated beam suitable for total internal reflection fluorescence (TIRF) imaging. However, aspheric optics is designed...
Book
Series: AIPP Books, Methods
Published: December 2021
10.1063/9780735423664
EISBN: 978-0-7354-2366-4
ISBN: 978-0-7354-2364-0
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