Improvement of the Accuracy of a Position-Sensitive Detector with a Wide Field of View
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ement of the Accuracy of a Position-Sensitive Detector with a Wide Field of View B. G. Podlaskina*, E. G. Guka, A. G. Obolenskova, and A. A. Sukhareva a
Ioffe Physical Technical Institute, Russian Academy of Sciences, St. Petersburg, 194021 Russia *e-mail: [email protected] Received June 5, 2020; revised June 5, 2020; accepted July 10, 2020
Abstract—The concept of improving the linearity of the coordinate characteristic and accuracy of the coordinate indication of a position-sensitive detector when expanding its field of view has been considered. The diagonal-segment topology of the detector has been analyzed taking into account the influence of the optical signal inhomogeneities and the spatial distribution of photosensitivity on its surface. Keywords: position-sensitive detector, diagonal topology, accuracy. DOI: 10.1134/S1063785020100132
Improving the accuracy and resolution of positionsensitive detectors remains an important problem despite the significant advances that have been made in this field. Currently, these devices are represented by three main types of detectors [1]: lateral positionsensitive detectors [2], Multiscan position-sensitive detectors [3], and segmented position-sensitive detectors [4]. The main drawbacks of the first two devices is that, in both cases, the linearity of the coordinate characteristics is determined by the uniformity of resistive layers, which provide proportional separation of photocurrents in the lateral position-sensitive detectors or high uniformity of the distributed measurement scale in the case of MultiScan position-sensitive detectors. It becomes clear from this that the hardware function of the device, which establishes the relationship of the measured value at the output of the position-sensitive detector with its true value at the input of the device, should be rigidly set by its topology. This approach to solving the problem is used in segmented position-sensitive detectors, where the formation of photocurrents I1 and I2 is performed using a separation gap that forms isolated segments on the detector photosensitive surface. These detectors have high resolution and performance, but they have an extremely small field of view and a limited optical spot size [5]. Their coordinate characteristic is nonlinear in principle and depends on the dynamic change in the shape of the optical signal that falls on them. All this restricts the scope of application of the segmented positionsensitive detectors to the centering and tracking systems [4, 5]. The problem of expanding the field of view of a segmented detector is solved in a position-sensitive
detector of this type with a diagonal division of segments [6, 7]. However, the accuracy of measuring the position of the light spot (determining the direction to the signal source) when using these devices also proved to be unacceptably low because of the dependence of the positioning results on the parameters’ light signal, which negated their potential advantages. In this paper, we consider the principles of constructing the seg
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