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Encoder, absolute positioning encoder method, and absolute positioning encoder system

An encoder and transmitter technology, applied in the field of terahertz-based positioning systems, can solve problems such as scanning distortion and phase distortion

Active Publication Date: 2020-11-13
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For THz waves with wavelengths less than 1mm, this depth variation leads to phase distortion and sweep distortion in the reflected waveform, which limits its use to some specific applications

Method used

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  • Encoder, absolute positioning encoder method, and absolute positioning encoder system
  • Encoder, absolute positioning encoder method, and absolute positioning encoder system
  • Encoder, absolute positioning encoder method, and absolute positioning encoder system

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Embodiment approach

[0223] The following description provides exemplary embodiments only, and is not intended to limit the scope, applicability or configuration of the present disclosure. Rather, the following description of the exemplary embodiments will provide those skilled in the art with an enabling description for implementing one or more exemplary embodiments. Various changes may be made in the function and arrangement of elements without departing from the spirit and scope of the disclosed subject matter as set forth in the appended claims.

[0224] In the following description specific details are given to provide a thorough understanding of the embodiments. However, it will be understood by one of ordinary skill in the art that the embodiments may be practiced without these specific details. For example, systems, processes, and other elements of the disclosed subject matter may be shown in block diagram form as components in order not to obscure the embodiments in unnecessary detail. ...

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Abstract

An encoder of a terahertz (THz)-based absolute positioning system used for decoding patterns from THz-band measurements. The encoder includes a scale with a multi-layer reflective / transmissive structure having a matrix with rows. Each row of the matrix corresponds to a plurality of patterns, such that each pattern is used to form a measurement. An emitter emits a THz waveform to the scale. A receiver is used to measure amplitudes of the THz waveform reflected from the scale. A memory stores data including predetermined positions of the emitter based on the patterns of the layers from the scale. Wherein one or more processors can determine a position of the emitter from the measurements of the amplitudes received by the receiver, based on the stored data. An output interface can be used torender the position of the emitter.

Description

technical field [0001] The present disclosure relates generally to terahertz-based (absolute) positioning systems, and more particularly to decoding pseudo-random patterns from THz band (transmission or reflection) measurements. Background technique [0002] Conventional terahertz (THz) sensing has been applied in gas sensing, humidity analysis, package inspection, biomedical diagnostics, and security screening. [0003] In raster scan mode, the sample to be examined is illuminated by a THz point source with time-compact source pulses and a small spot size (or aperture). A THz emitter sends a focused beam at normal incidence to examine a small area (or pixel) of the sample, the detector then samples the corresponding reflected waveform via an electro-optic sampling process, and a programmable mechanical grating moves the sample in a plane perpendicular to the incident waveform In order to measure the two-dimensional surface of the sample. THz with raster scan mode is used ...

Claims

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Application Information

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IPC IPC(8): G01D5/347
CPCG01D5/34746G01D5/34792G01D5/48G02B26/101G01B11/2518G01N21/3586
Inventor 王璞符浩宇菲利普·奥尔利克秋浓俊昭马瑞王炳南
Owner MITSUBISHI ELECTRIC CORP