Optical Design of Endoscopic Telecentric Measuring Apparatus

2013 ◽  
Vol 552 ◽  
pp. 325-328
Author(s):  
Qiong Wu ◽  
Yang Xiang ◽  
Bin Yang ◽  
Qian Song ◽  
Li Jie Hou ◽  
...  
Keyword(s):  
Surface Defects ◽  
Optical Design ◽  
Mirror Image ◽  
Depth Of Field ◽  
Modulation Transfer ◽  
Master Cylinder ◽  
Precision Measuring ◽  
Pentagonal Prism ◽  
Airy Disk ◽  
To Receive

Endoscopic telecentric apparatus is a precision measuring instrument which consists of optical, mechanical and electrical technologies. It can be applied in real-time accurate test to detect the position, shape and wall surface defects of brake master cylinder. This paper designed an optical system with Zemax, it can be used in endoscopic telecentric apparatus. The system has 4mm linear field of view, the line of vision is 90°,the magnification is 0.75×,the depth of field is 6mm.The value of modulation transfer function (MTF) is close to the diffraction limit, the resolution of the system is up to 3 and the spot diagrams of all configurations are smaller than Airy disk, the total track is less than 300mm. It adopts 1/6CCD to receive image, the measurement accuracy reaches to 0.03mm.The system uses pentagonal prism to realize 90°line of vision, it is convenient to assemble and avoids the mirror image. The image quality is good and the design meets the requirement.

scholarly journals Manufacture of Contact Lens of Nanoparticle-Doped Polymer Complemented with ZEMAX

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2028
Author(s):  
Lina M. Shaker ◽  
Ahmed A. Al-Amiery ◽  
Abdul Amir H. Kadhum ◽  
Mohd S. Takriff
Keyword(s):  
Contact Lenses ◽  
Titanium Dioxide Nanoparticles ◽  
Optical Design ◽  
Sol Gel ◽  
High Refractive Index ◽  
Light Transmittance ◽  
Great Promise ◽  
Modulation Transfer ◽  
Tio2 Nps ◽  
Molding Method

Many people suffer from myopia or hyperopia due to the refractive errors of the cornea all over the world. The use of high refractive index (RI), Abbe number (νd), and visible light transmittance (T%) polymeric contact lenses (CLs) holds great promise in vision error treatment as an alternative solution to the irreversible laser-assisted in situ keratomileusis (LASIK) surgery. Titanium dioxide nanoparticles (TiO2 NPs) have been suggested as a good candidate to rise the RI and maintain high transparency of a poly(methyl methacrylate) (PMMA)-TiO2 nanocomposite. This work includes a preparation of TiO2 NPs using the sol gel method as well as a synthesis of pure PMMA by free radical polarization and PMMA-TiO2 CLs using a cast molding method of 0.005 and 0.01 w/v concentrations and a study of their effect on the aberrated human eye. ZEMAX optical design software was used for eye modeling based on the Liou and Brennan eye model and then the pure and doped CLs were applied. Ocular performance was evaluated by modulation transfer function (MTF), spot diagram, and image simulation. The used criteria show that the best vision correction was obtained by the CL of higher doping content (p < 0.0001) and that the generated spherical and chromatic aberrations in the eye had been reduced.

Design of Projection Lithography Objective Lens with Sub-Ten Micrometer Line-Width and its MTF Experimental Measurements

2014 ◽  
Vol 901 ◽  
pp. 111-115
Author(s):  
Liang Lei ◽  
Xin Liu ◽  
Lang Lin Li ◽  
Jin Yun Zhou
Keyword(s):  
Wave Length ◽  
Optical Design ◽  
Field Of View ◽  
Objective Lens ◽  
Modulation Transfer ◽  
Projection Lithography ◽  
Fold Reduction ◽  
Result Show ◽  
Design Software ◽  
Imaging Performance

Double fold reduction projection lithography objective lens with bi-telecentric configuration, consists of 6 lenses and the number aperture , is designed based on the optical design software Zemax. It uses the 405nm laser diode (LD) as light source. The spatial resolving capacity approaches to 5um. In a field of view of , its wave-front aberration is less than a quarter of wave-length and the distortion ratio is not more than. The imaging performance, in particular, the accurate modulation transfer function (MTF) value of the projection objective lens being fabricated by experiments is determined in this paper. Through analyzing the noise disturbance law in MTF tests, the result show that the projection objective lens has sub ten micrometer resolving ability.

scholarly journals The influence of Kanthal wire surface defects on the formation of Si nanolayer deposited by PVD method

2018 ◽  
Vol 36 (2) ◽  
pp. 264-269 ◽  
Author(s):  
Mieczysław Szczypiński ◽  
Kazimierz Reszka ◽  
Michał M. Szczypiński
Keyword(s):  
Surface Defects ◽  
Ion Beam ◽  
Erosive Wear ◽  
Optical Microscope ◽  
Dark Field ◽  
Expanded Polystyrene ◽  
Depth Of Field ◽  
Wire Surface ◽  
Transmission Microscopy ◽  
The Wire

Abstract The subject of this research is the structure of a Si nanolayer deposited on a FeCrAl wire surface by means of magnetron sputtering method. Si layer was selected as one of possible protections of the wire surface against excessive corrosive-erosive wear. In order to increase the power necessary for the DC discharge of the magnetron with Si cathode, a second magnetron with an aluminum disc as a cathode was used. The wire was attached to a carousel holder to ensure its rotation around the magnetron. The thickness of the deposited layers was about 150 nm. A wire surface examination indicated the presence of defects such as gaps between grains, cavities as well as severely deformed grains of surface layer. The research was conducted on the sample sections which had been prepared by focused ion beam method (FIB). The technique of transmission microscopy, which was used for observation, allowed us to obtain images in bright field (BF), dark field (DF), as well as in high resolution (HREM). The studies were also performed on the wire surface after the cutting process of the expanded polystyrene blocks. A metallographic optical microscope Nikon MA200 with a large depth of field was used for the examination which showed the presence of carbon deposit products. Additionally, a composition microanalysis was carried out along the line within selected areas of samples, with the use of energy dispersive spectroscopy (EDS). A large impact of wire surface defects on Si layer forming was found as well as a high direct homogeneous growth. The examination of the sections indicated the existence of a mechanism of defects sealed by Si layer, where directionality of grains growth in these areas revealed the tendency for vertical location relative to defects surface. Consequently, closed nanopores, i.e. spaces not covered with Si layer, were created. It is a characteristic feature of areas with defects covered with an oxide film created in a natural way.

Optical design and laboratory test of an internal pushbroom hyperspectral microscopy

2019 ◽  
Vol 33 (12) ◽  
pp. 1950143 ◽  
Author(s):  
Zhoufeng Zhang ◽  
Bingliang Hu ◽  
Qinye Yin ◽  
Tao Yu ◽  
Zhaohui Zhang
Keyword(s):  
Optical Design ◽  
Disease Diagnosis ◽  
Medical Applications ◽  
Modulation Transfer ◽  
Compact Structure ◽  
Full Spectrum ◽  
Full Field ◽  
Spectral Signatures ◽  
Imaging Results ◽  
Spectral Channels

Hyperspectral imaging is an emerging technology for various medical applications, especially in disease diagnosis of early and biomedical research based on their unique spectral signatures. A hyperspectral microscopy based on a prism-grating-prism is designed for various medical applications. The spectral range between 400 nm to 800 nm is sampled by 256 spectral channels, the modulation transfer function (MTF) values of full spectrum and full field of view are close to the diffraction limit, the smile is less than 6.4% of a pixel, and the keystone is less than 1.6% of a pixel. At the same time, the hyperspectral microscopy used an internal pushbroom technology, which has the advantages of compact structure and good portability. The spectral imaging results demonstrate the great potential of this internal pushbroom hyperspectral microscopy for the pathologists to automatically detect tumor tissue in pathological slides and early disease diagnosis.

scholarly journals Tri-Dimensional Optical Inspection Based on Flexible Image Guide: First Step Toward 3D Industrial Endoscopy

2012 ◽  
Author(s):  
Erwan Dupont ◽  
Frédéric Lamarque ◽  
Christine Prelle ◽  
Tanneguy Redarce
Keyword(s):  
Optical Design ◽  
Digital Camera ◽  
Reconstruction Algorithm ◽  
Depth Of Field ◽  
Image Guide ◽  
Optical Inspection ◽  
Circular Field ◽  
Dimensional Shape ◽  
Mechanical Objects ◽  
532 Nm

3D optical endoscopy is now a major challenge to allow the high resolution inspection of industrial equipments. The proposed instrument is based on a flexible image guide (70 000 fibres) and a Digital Micro mirror Device (DMD, 1024 × 768 “on-off” micro mirrors). The optical design is as follows: the light emitted by a 532 nm laser diode is dynamically structured by the DMD chip as a fringes pattern which is phase-shifted due to the active control of the DMD chip and projected onto an object on a circular field of 6 mm in diameter. Due to a telecentric and binocular arrangement that creates a stereoscopic angle, it is possible to get a depth of field of 2 mm along the optical axis without keystone distortions and few disturbances created by defocus and coma aberrations. Then, images are captured by a 1024 × 768 digital camera (not yet moved away by fibres) at 15 fps and directly used in the reconstruction algorithm to access the tri-dimensional shape of the unpainted object. The results are compared to incoherent white light results obtained with white painted mechanical objects. The lateral resolution is 31.3 μm and the RMS axial resolution is 10 μm for the laser-based design after speckle attenuation.

scholarly journals Designing a video laryngoscope imaging system with a 7mm blade for neonatal patients

2018 ◽  
Vol 201 ◽  
pp. 04002
Author(s):  
Ming-Ying Hsu ◽  
Wen-Tse Hsiao ◽  
Han-Chao Chang
Keyword(s):  
Imaging System ◽  
Optical Design ◽  
Intrathoracic Pressure ◽  
Video Laryngoscope ◽  
Depth Of Field ◽  
Birth Canal ◽  
Core Technology ◽  
Ventilation Failure ◽  
Optical Imaging System ◽  
Small Mouth

When a newborn infant has been pushed from the birth canal due to ventilation failure while using a resuscitation mask, the doctor must implement infant intubation and other emergency steps to keep the baby alive. However, due to the excessively small mouth area of a newborn or premature infant, the doctors are unable to view the glottis entrance, which can lead to either a failed intubation or longer intubation time, thereby resulting in either a drop in oxygen levels or a rise in intrathoracic pressure. Although the normal video laryngoscope with a 12mm metal blade certainly improves this type of difficult intubation, nevertheless, doctors often complain that the depth of field (DOF) is insufficient and the width of the blade is too wide when performing intubation on neonatal patients. Therefore, this study aims to develop two modules of infant’s video laryngoscope, an ultra-thin 7mm metal blade and an optical imaging system, the core technology of which includes an optical design of a 2.5mm lens and verifications of imaging quality. In order to allow physicians to determine the infant’s airway position immediately and to avoid the binocular disparity from a physician while giving intubation, this study has simulated the optical properties of monolithic lenses while designing the imaging system, allowing the doctor to have a clearer and undistorted image within the field of view.

Integrated Multi-Object Taguchi Method with Optical Design for Contact Lenses

2013 ◽  
Vol 479-480 ◽  
pp. 166-169
Author(s):  
Chih Ta Yen ◽  
Ing Jr Ding ◽  
Hsu Chih Cheng ◽  
Jhe Wen Ye ◽  
Jyun Min Shih
Keyword(s):  
Taguchi Method ◽  
Contact Lenses ◽  
Spherical Aberration ◽  
Optical Design ◽  
Principal Component ◽  
Design Parameters ◽  
Modulation Transfer ◽  
Multiple Quality Characteristics ◽  
Spherical Surfaces ◽  
Coma Aberration

In this research, a contact lens design for myopia and astigmatism eyes was proposed. With two spherical surfaces assembled in the optical system, the design could take advantage of compacting overall volume size. But in this design, the value of spherical aberration (SA) at wide radius of contact lenses seems lower. If we corrected the design to improve the value of SA, Modulation Transfer Function (MTF) and coma aberration (TCO) value would become lower relatively. In this study, we integrated the Taguchi method and principal component analysis (PCA) to optimize the multiple quality characteristics (SA, TCO and MTF) of the contact lenses. With the combination of the methods, a set of optimum design parameters was well selected to balance the values of SA, TCO and MTF that improve the SA 25.63%, TCO 91.88% and MTF 2.4%. It was concluded that the integration of the Taguchi method and PCA succeeded in optimizing the SA, TCO and MTF values, and the contact lenses could be well designed without sacrificing system performance.

scholarly journals Investigation of extended depth-of-field f/8 camera with optimized cubic phase mask and digital restoration

2020 ◽  
Vol 238 ◽  
pp. 03008
Author(s):  
Po-Sheng Chiu ◽  
Kurt Vonmetz ◽  
Federico Canini ◽  
H. Paul Urbach
Keyword(s):  
Mean Squared Error ◽  
Imaging System ◽  
Optimal Solution ◽  
Phase Mask ◽  
Depth Of Field ◽  
Cubic Phase ◽  
Modulation Transfer ◽  
Original Design ◽  
Digital Restoration ◽  
Extended Depth Of Field

An investigation of extended depth-of-field camera with optimized phase mask and digital restoration is presented. The goal of this paper is to implement the wavefront coding technique without affecting much of the original design, and the design has taken the complexity of imaging system into consideration. The optimized strength of cubic phase mask (CPM) is based on the analytical optimal solution for the task-based imaging system [J. Opt. Soc. Am. A 25, 1064 (2008)]. The noisy intermediate images of CPM system with highest spatial frequency of interest can be effectively restored by vector-based Richardson-Lucy algorithm. Restoration from the system with generalized CPM produces precise image position than the system with CPM does. In general, the CPM system procures modulation transfer function higher than 0.195 in the whole depth-of-field, and the mean squared error of the restored images are less than 5 %.

scholarly journals Experimental research of limits for thermal modulation transfer function

2009 ◽  
Vol 13 (4) ◽  
pp. 119-128 ◽  
Author(s):  
Ljubisa Tomic ◽  
Momcilo Milinovic
Keyword(s):  
Transfer Function ◽  
Short Duration ◽  
Experimental Research ◽  
Modulation Transfer Function ◽  
Infrared Radiation ◽  
Surface Defects ◽  
Experimental Measurements ◽  
Infrared Sensor ◽  
Modulation Transfer ◽  
Thermal Modulation

The paper presented testing of surface defects by pulse video thermography techniques. Such techniques rely on transient infrared radiation from the sample heated by the short duration flux initiated by flesh. Experimental measurements are realized by infrared sensor (FLIR camera). Testing results are considered for the samples with controlled designed defects beyond observed surfaces. The effects of response through the transparent wall are measured as infrared visible radiance. Researches with controlled samples are performed to verify visibility threshold of defect dimensions and forms, for possible use as modulation transfer function of defects hidden beyond the surfaces of thin metal walls. Dimensionless coefficients are derived for method estimations as the results from experimental research.

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