A photographic objective employing axial gradient-index (GRIN) elements is described and compared with a conventional double Gauss lens. Comparable imaging performance and increased relative illumination at the edge o...
详细信息
ISBN:
(纸本)081941249X
A photographic objective employing axial gradient-index (GRIN) elements is described and compared with a conventional double Gauss lens. Comparable imaging performance and increased relative illumination at the edge of field are realized in the GRIN design even though it has fewer optical elements.
The optical system of an optical rotary encoder is presented. The requirements of the optics system are given and their effects on opticaldesign decisions are discussed, Steps taken to insure stable operation over a ...
详细信息
ISBN:
(纸本)0819422517
The optical system of an optical rotary encoder is presented. The requirements of the optics system are given and their effects on opticaldesign decisions are discussed, Steps taken to insure stable operation over a -40 degrees C to +85 degrees C temperature range are presented. designing for manufacturing toleraces is discussed. A novel application of a fiber illuminator LED as a short-distance collimated source is shown to be an acceptable low-cost alternative to a laser diode. The importance of effective plastic element employment in low-cost, mass-production optical systems is demonstrated.
Hybrid optics offer a valuable aberration correction tool for the lens designer. However, careful consideration must be given to the calculation of the optical performance during the design process, and to the practic...
详细信息
ISBN:
(纸本)0819441554
Hybrid optics offer a valuable aberration correction tool for the lens designer. However, careful consideration must be given to the calculation of the optical performance during the design process, and to the practical implementation of the elements if the potential benefits are to be realised in practice. optical performance can be accurately assessed by tracing multiple diffraction orders. It may be particularly important to utilise such a technique if, for example, the image-forming bundles sample a small number of diffractive zones. This situation is examined in detail.
With many optical systems the method that is used to align the optical system needs to be an integral portion of the system design and not an afterthought. Once all the pieces are in fabrication it may be too late to ...
详细信息
ISBN:
(纸本)0819406554
With many optical systems the method that is used to align the optical system needs to be an integral portion of the system design and not an afterthought. Once all the pieces are in fabrication it may be too late to implement a cost-effective alignment procedure for both prototype and production designs. This is especially true with catadioptric systems where the mirror alignment tends to be very critical as far as system performance is concerned. This paper describes the design and use of an aspheric null mirror for the alignment of a two mirror subsystem to a lens cell. The optical system to be aligned was a six-in. EFL, F/2 system working in the 3-5 micrometers bandpass. It consisted of two aspheric mirrors, one aspheric lens, and two spherical lenses.
The design of a wide field-of-view head-mounted display (HMD) is very challenging. Unfortunately, traditional design methods produce low-resolution imagery that is unacceptable for some tasks. One method of addressing...
详细信息
ISBN:
(纸本)0819432652
The design of a wide field-of-view head-mounted display (HMD) is very challenging. Unfortunately, traditional design methods produce low-resolution imagery that is unacceptable for some tasks. One method of addressing this challenge is to optically tile several smaller field-of-view displays to form a single, wide field-of-view, high-resolution image. This paper will address design issues specific to optically tiled systems including optical performance, seam placement and binocular rivalry.
The CVROS scanner, a new approach to high speed serial optical scanning employing a scan disc, has been successfully developed for thermal imaging. Its high speed, high scan efficiency, wide field, and mirror optics s...
详细信息
ISBN:
(纸本)0819415871
The CVROS scanner, a new approach to high speed serial optical scanning employing a scan disc, has been successfully developed for thermal imaging. Its high speed, high scan efficiency, wide field, and mirror optics suggest applicability to broad band visible scanners and projectors as well as laser and UV printers. This paper reviews the CVROS concept and presents the configuration adaptations required for finite conjugate applications. design and performance characteristics are given for several configurations as well as key alignment and manufacturing requirements.
Some results obtained in the realization of compact relay systems design are presented. Four optical configurations have been analyzed. Two symmetrical schemes were examined having field Smith's lenses for a image...
详细信息
ISBN:
(纸本)0819432652
Some results obtained in the realization of compact relay systems design are presented. Four optical configurations have been analyzed. Two symmetrical schemes were examined having field Smith's lenses for a image scaling of-ix. The achieved numerical aperture is up to 0.35 and the MTFs curves are at 40 cycles1/mm for a contrast ratio of 0.2. The third design has a large field of 40 mm but its F-number is about F/4.5. The last relay system is unsymmetrical. The scaling is 2x and the image field exceeds 50 mm. The aberration balancing results and the optical systems performance are illustrated.
The long range observation system (LROS) is based on Ritchey—chretien telescope that was designed, built and tested by ELOP. The telescope is rxunted inside a sealed external structure with large entrance window. The...
详细信息
ISBN:
(纸本)0819409251
The long range observation system (LROS) is based on Ritchey—chretien telescope that was designed, built and tested by ELOP. The telescope is rxunted inside a sealed external structure with large entrance window. The concept adapted in the LROS design is to divide the mechanical structures into two major assemblies: — Internal optical bench that supports the sensitive optical elennts . This bench is based on a structure made of composite material. — External body that protects and seals the internal optical structure. This structure includes large entrance window and interface flanges that can be supported on mba, tripod or a pedestal. The key to this design was to properly select and size these two structures in order to achieve the nost rigid but light—weighted structhre . This paper describes the study that was made to specify design criteria and to analyse the design according to these criteria.
Freeform optical shapes or optical surfaces that arc designed with non-symmetric features arc gaining popularity with lens designers and optical system integrators. Tolerances on a freeform opticaldesign influence th...
详细信息
ISBN:
(纸本)9781628417449
Freeform optical shapes or optical surfaces that arc designed with non-symmetric features arc gaining popularity with lens designers and optical system integrators. Tolerances on a freeform opticaldesign influence the optical fabrication process. Case studies and soft tolerance limits for easier fabrication will be discussed. This paper will also give a high level overview of a freeform optical fabrication process that includes generation. high speed VIBE polishing, sub-aperture figure correction and testing of freeform surfaces.
The 'concentric-aplanatic' method used for lens design is described in many papers. While many shapes and forms of these lenses have been shown, performance evaluation of these lenses has never been published....
详细信息
ISBN:
(纸本)0819403954
The 'concentric-aplanatic' method used for lens design is described in many papers. While many shapes and forms of these lenses have been shown, performance evaluation of these lenses has never been published. How good is the method? Can one designoptical systems using this technique that have acceptable image quality? This paper will deal step by step with these questions, both from first principles and by the basis of third order theory. Performance evaluations will be given for the lenses designed.
暂无评论