A polarized head-mounted projective display

Hua, Hong; Gao, Chunyu

doi:10.1109/ismar.2005.6

Cited by 12 publications

(10 citation statements)

References 10 publications

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“…Through the eyepiece, a virtual image is formed. And the mirror also bends the rays at 90° and reflects the virtual images into the user's eyes, thereby optically combining real and virtual world views [9] . The eyepiece should be designed to match the UV objective lens, i.e.…”

Section: The Solar-blind Uv Head-mounted Displaysmentioning

confidence: 99%

The research on a novel type of the solar-blind UV head-mounted displays

Zhao

2011

SPIE Proceedings

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Ultraviolet technology of detecting is playing a more and more important role in the field of civil application, especially in the corona discharge detection, in modern society. Now the UV imaging detector is one of the most important equipments in power equipment flaws detection. And the modern head-mounted displays (HMDs) have shown the applications in the fields of military, industry production, medical treatment, entertainment, 3D visualization, education and training. We applied the system of head-mounted displays to the UV image detection, and a novel type of head-mounted displays is presented: the solar-blind UV head-mounted displays. And the structure is given. By the solar-blind UV head-mounted displays, a real-time, isometric and visible image of the corona discharge is correctly displayed upon the background scene where it exists. The user will see the visible image of the corona discharge on the real scene rather than on a small screen. Then the user can easily find out the power equipment flaws and repair them.Compared with the traditional UV imaging detector, the introducing of the HMDs simplifies the structure of the whole system. The original visible spectrum optical system is replaced by the eye in the solar-blind UV head-mounted displays.And the optical image fusion technology would be used rather than the digital image fusion system which is necessary in traditional UV imaging detector. That means the visible spectrum optical system and digital image fusion system are not necessary. This makes the whole system cheaper than the traditional UV imaging detector. Another advantage of the solar-blind UV head-mounted displays is that the two hands of user will be free. So while observing the corona discharge the user can do some things about it. Therefore the solar-blind UV head-mounted displays can make the corona discharge expose itself to the user in a better way, and it will play an important role in corona detection in the future. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/26/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspxHigh-voltage electrical apparatus often are surrounded by a corona discharge which occurs when the electric field in the surrounding air exceeds the threshold for dielectric breakdown of air. When this occurs, the surrounding air becomes partially conducting. Apparatus such as electrical power transmission lines, transformer insulators and bushings, high-voltage power supplies, and the like often have coronas associated therewith [1] . And there may be a sign of defect or malfunction of the electrical apparatus. Therefore, detecting and addressing potential equipment failure is very important to guarantee the reliable operation of the electrical apparatus. In order to detect and address potential equipment failure, the position and extent of the coronas should be detected.Usually it is difficult to detect coronas under conditions of sunlight. One technique used to detect and identify the general position of coronas involves the use of ...

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Section: The Solar-blind Uv Head-mounted Displaysmentioning

confidence: 99%

The research on a novel type of the solar-blind UV head-mounted displays

Zhao

2011

SPIE Proceedings

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“…An intermediate image with full FOV is formed and refocused onto the peripheral imaging CCD (i) by the lens (h). In order to reduce the light loss through beamsplitting, especially for the foveated imager in which the beam is split twice, a polarizing beam splitter (PBS) together with a quarter wave plate [10] is utilized as shown in Figure 1. It theoretically results in a 50/50 beam splitting between the foveated and peripheral image without losses for both beams and leads to a very compact design as well.…”

Section: Schematic Designmentioning

confidence: 99%

Design of a Foveated Imaging System Using a Two-Axis MEMS Mirror

Liu¹,

Pansing²,

Hong³

2006

International Optical Design

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We present a novel foveated imaging system which consists of three major components: a foveated imager, a peripheral imager, and a 2D scanning sub-system. The foveated imager captures a narrow field of view (FOV) with high angular resolution to mimic the foveated region of interest (FRoI), and the peripheral imager captures a wide FOV with low angular resolution to provide the peripheral region for context. The scanning system, implemented with a single-element two-axis MEMS mirror, is capable of sweeping the FRoI across the entire FOV at a maximum speed of 100Hz. A bench prototype and experimental results are presented as verifications of our optical design concept and feasibility.

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“…The light from the microdisplay is attenuated due to multiple beam splitting and low retroreflectivity of a retroreflective screen, resulting in a low luminance transfer efficiency of ϳ4%. A polarized HMPD (p-HMPD) design was recently proposed to enhance the overall flux transfer efficiency and thus increase the brightness and contrast of displayed images [19]. Different from conventional nonpolarizing HMPD designs, the light polarization states in a p-HMPD system are deliberately manipulated to maximize the flux transfer efficiency, which can potentially result in three times higher efficiency than that of a nonpolarizing HMPD.…”

Section: Introductionmentioning

confidence: 99%

Characterizing polarization management in a p-HMPD system

Zhang

Hua

2008

Appl. Opt.

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It has been a common challenge to operate optical see-through head-mounted displays in well-lit environments due to the low image brightness and contrast compared with the direct view of a real-world scene. This problem is aggravated in the design of a see-through head-mounted projection display (HMPD) in which the projected light is split twice by a beam splitter and further attenuated greatly by a retroreflective screen. A polarizing head-mounted projection display (p-HMPD) design was recently proposed to enhance the overall flux transfer efficiency and thus increase the brightness and contrast of displayed images. Different from the conventional nonpolarizing HMPD designs, the light polarization states in the p-HMPD system are deliberately manipulated to maximize the flux transfer efficiency, which can potentially result in three times higher efficiency than that of a nonpolarizing HMPD. By measuring the Mueller matrices of the major elements in both a p-HMPD and a nonpolarizing HMPD, we characterize the polarization dependence of each element on incident angles and wavelengths, and also investigate the depolarization effect of the retroreflective screen. Based on these experimental results, we further examine the overall luminance efficiencies of the two types of systems and analyze how various aspects of display performances are affected by the angular and chromatic dependence of the polarization components.

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A polarized head-mounted projective display

Cited by 12 publications

References 10 publications

The research on a novel type of the solar-blind UV head-mounted displays

The research on a novel type of the solar-blind UV head-mounted displays

Design of a Foveated Imaging System Using a Two-Axis MEMS Mirror

Characterizing polarization management in a p-HMPD system

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