scholarly journals A compact led lidar system fitted for a mars rover – design and ground experiment

2018 ◽  
Vol 176 ◽  
pp. 02013
Author(s):  
Prane Mariel B. Ong ◽  
Tatsuo Shiina ◽  
Naohiro Manago ◽  
Hiroaki Kuze ◽  
Hiroki Senshu ◽  
...  
Keyword(s):  
Light Source ◽  
Optical System ◽  
Repetition Frequency ◽  
Field Of View ◽  
Dust Devils ◽  
Lidar System ◽  
Mars Rover ◽  
Ground Experiment ◽  
Optical Axes ◽  
Cassegrain Telescope

A compact LED lidar was constructed and fieldtested with the aim to observe the Mars’ dust devils. To be able to fit it on the Mars rover, a specialized Cassegrain telescope was designed to be within a 10 cm-cube, with a field of view of 3mrad. The transmitter has 385 nm LED light source with 3 cmϕ opening, 70mrad divergence, 0.75W (7.5nJ/10ns) pulse power, and 500 kHz repetition frequency. The configuration of the optical system is biaxial to easily configure the overlap between their optical axes.

scholarly journals Wide field-of-view crossed Dragone optical system using anamorphic aspherical surfaces

2018 ◽  
Vol 57 (15) ◽  
pp. 4171 ◽  
Author(s):  
Shingo Kashima ◽  
Masashi Hazumi ◽  
Hiroaki Imada ◽  
Nobuhiko Katayama ◽  
Tomotake Matsumura ◽  
...  
Keyword(s):  
Optical System ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View

Performance of the far-IR beamline of the 6 MeV tabletop synchrotron light source

2009 ◽  
Vol 16 (2) ◽  
pp. 299-306 ◽  
Author(s):  
Md. Monirul Haque ◽  
Hironari Yamada ◽  
Ahsa Moon ◽  
Mami Yamada
Keyword(s):  
Light Source ◽  
Optical System ◽  
Far Infrared ◽  
Beam Current ◽  
Small Ring ◽  
Thermal Source ◽  
Simulation Code ◽  
Dynamic Aperture ◽  
Electron Orbit ◽  
Synchrotron Light

The performance of the far-infrared (FIR) beamline of the 6 MeV tabletop synchrotron light source MIRRORCLE-6FIR dedicated to far-infrared spectroscopy is presented. MIRRORCLE-6FIR is equipped with a perfectly circular optical system (PhSR) placed around the 1 m-long circumference electron orbit. To illustrate the facility of this light source, the FIR output as well as its spectra were measured. The optimum optical system was designed by using the ray-tracing simulation code ZEMAX. The measured FIR intensity with the PhSR in place is about five times higher than that without the PhSR, which is in good agreement with the simulation results. The MIRRORCLE-6FIR spectral flux is compared with a standard thermal source and is found to be 1000 times greater than that from a typical thermal source at ∼15 cm−1. It is also observed that the MIRRORCLE-6FIR radiation has a highly coherent nature. The broadband infrared allows the facility to reach the spectral range from 10 cm−1 to 100 cm−1. MIRRORCLE-6FIR, owing to a large beam current, the PhSR mirror system, a large dynamic aperture and small ring energy, can deliver a bright flux of photons in the FIR/THz region useful for broadband spectroscopy.

Otoscopy and Photography

1979 ◽  
Vol 88 (6) ◽  
pp. 771-773 ◽  
Author(s):  
Benjamin Chen ◽  
Terry L. Fry ◽  
Newton D. Fischer
Keyword(s):  
Light Source ◽  
Clinical Application ◽  
Middle Ear ◽  
Optical System ◽  
Strobe Light ◽  
System A ◽  
The Subject ◽  
Ear Canals ◽  
Light Color ◽  
Otoscopic Examination

A new hand-held otoscope photographic system, convenient and suitable for clinical application, is introduced. This instrument allows clear otoscopic examination in stenotic or tortuous ear canals, and photographs the subject in one procedure. The instrument consists of a rodlens optical system, a fiberoptic light source, a camera, and exchangeable speculum and a strobe light. Color photographs of tympanic membranes and middle ear pathology are presented.

A novel defect detection optical system using 199-nm light source for EUVL mask

2010 ◽  
Author(s):  
Ryoichi Hirano ◽  
Nobutaka Kikuiri ◽  
Masatoshi Hirono ◽  
Riki Ogawa ◽  
Hiroyuki Sigemura ◽  
...  
Keyword(s):  
Light Source ◽  
Defect Detection ◽  
Optical System

scholarly journals A Miniature Optical Force Dual-Axis Accelerometer Based on Laser Diodes and Small Particles Cavities

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1375
Author(s):  
Junji Pu ◽  
Kai Zeng ◽  
Yulie Wu ◽  
Dingbang Xiao
Keyword(s):  
Light Source ◽  
Optical System ◽  
High Sensitivity ◽  
Measurement Range ◽  
Optical Force ◽  
Zero Bias ◽  
Micro Electro Mechanical Systems ◽  
Force Effect ◽  
High Measurement ◽  
Mems Technology

In recent years, the optical accelerometer based on the optical trapping force effect has gradually attracted the attention of researchers for its high sensitivity and high measurement accuracy. However, due to its large size and the complexity of optical path adjustment, the optical force accelerometers reported are only suitable for the laboratory environment up to now. In this paper, a miniature optical force dual-axis accelerometer based on the miniature optical system and a particles cavity which is prepared by Micro-Electro-Mechanical Systems (MEMS) technology is proposed. The overall system of the miniature optical levitation including the miniature optical system and MEMS particles cavity is a cylindrical structure with a diameter of about 10 mm and a height of 33 mm (Φ 10 mm × 33 mm). Moreover, the size of this accelerometer is 200 mm × 100 mm × 100 mm. Due to the selected light source being a laser diode light source with elliptical distribution, it is sensitive to the external acceleration in both the long axis and the short axis. This accelerometer achieves a measurement range of ±0.17 g–±0.26 g and measurement resolution of 0.49 mg and 1.88 mg. The result shows that the short-term zero-bias stability of the two orthogonal axes of the optical force accelerometer is 4.4 mg and 9.2 mg, respectively. The main conclusion that can be drawn is that this optical force accelerometer could provide an effective solution for measuring acceleration with an optical force effect for compact engineering devices.

scholarly journals Beamline K11 DIAD: a new instrument for dual imaging and diffraction at Diamond Light Source

2021 ◽  
Vol 28 (6) ◽  
Author(s):  
Christina Reinhard ◽  
Michael Drakopoulos ◽  
Sharif I. Ahmed ◽  
Hans Deyhle ◽  
Andrew James ◽  
...  
Keyword(s):  
Light Source ◽  
Field Of View ◽  
Phase Identification ◽  
Specific Information ◽  
Beam Design ◽  
Dual Beam ◽  
New Instrument ◽  
In Operando ◽  
Dual Imaging

The Dual Imaging and Diffraction (DIAD) beamline at Diamond Light Source is a new dual-beam instrument for full-field imaging/tomography and powder diffraction. This instrument provides the user community with the capability to dynamically image 2D and 3D complex structures and perform phase identification and/or strain mapping using micro-diffraction. The aim is to enable in situ and in operando experiments that require spatially correlated results from both techniques, by providing measurements from the same specimen location quasi-simultaneously. Using an unusual optical layout, DIAD has two independent beams originating from one source that operate in the medium energy range (7–38 keV) and are combined at one sample position. Here, either radiography or tomography can be performed using monochromatic or pink beam, with a 1.4 mm × 1.2 mm field of view and a feature resolution of 1.2 µm. Micro-diffraction is possible with a variable beam size between 13 µm × 4 µm and 50 µm × 50 µm. One key functionality of the beamline is image-guided diffraction, a setup in which the micro-diffraction beam can be scanned over the complete area of the imaging field-of-view. This moving beam setup enables the collection of location-specific information about the phase composition and/or strains at any given position within the image/tomography field of view. The dual beam design allows fast switching between imaging and diffraction mode without the need of complicated and time-consuming mode switches. Real-time selection of areas of interest for diffraction measurements as well as the simultaneous collection of both imaging and diffraction data of (irreversible) in situ and in operando experiments are possible.

Sign in / Sign up

Export Citation Format

Share Document