منابع مشابه
Rapid Pinhole Growth in the F160BW Filter
The WFPC2 Filter F160BW, also known as WOOD’s filter, was designed to transmit UV emission around 150nm and strongly block all other wavelengths. The filter has a unique construction where a thin film of sodium metal serves as the spectral element. However, sodium is a highly unstable and reactive metal, which makes the filter susceptible to changes over time. Herein we report a rapidly growing...
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In photogrammetric applications, the measurements are conducted on images given by optical imaging systems (cameras). In order to ensure the demanded accuracy, those cameras have to be well calibrated geometrically. A new method for measuring glass lens distortion based on using distortion-free pinhole lens is proposed, where the measure of the distortion progress is derived by comparing two im...
متن کاملPinhole Zone Plate Lens for Ultrasound Focusing
The focusing capabilities of a pinhole zone plate lens are presented and compared with those of a conventional Fresnel zone plate lens. The focusing properties are examined both experimentally and numerically. The results confirm that a pinhole zone plate lens can be an alternative to a Fresnel lens. A smooth filtering effect is created in pinhole zone plate lenses, giving rise to a reduction o...
متن کاملPinhole Mask Sensor a Pinhole Mask Sensor
Figure 1 shows an example of a light field camera with a pinhole mask in front of the sensor. If we look at the sensor in 1D and assume an total x-resolution of 900 pixels and a Θ resolution of 9, the local x resolution is 100. The disadvantages are therefore a loss in resolution and a loss of light, as most of the light gets blocked by the mask. Therefore, while this model is very clean on a t...
متن کاملSpatial Filter Issues
Beamlet measurements show that cone pinholes outperform other types tested with regard to both closure and back reflections. A *I50 prad stainless steel cone remained open for a 15.5 kJ, 10: 1 contrast shaped pulse with Ifi7.5 mad of SSD divergence, which more than meets the requirements for a NIF ignition pulse. Measurements also showed the maximum tolerable pressures in the NIF spatial filter...
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ژورنال
عنوان ژورنال: Physics Education
سال: 1979
ISSN: 0031-9120
DOI: 10.1088/0031-9120/14/1/009