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Optical Measurement of Displacement

A displacement and optical system technology, applied in optical signal detection transducers, measuring devices, optical devices, etc., can solve problems such as accumulation of displacement measurement errors

Active Publication Date: 2021-07-09
ANALOG DEVICES INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This leads to an accumulation of errors in the displacement measurement, which is unacceptable for a feed-forward method of controlling the loudspeaker

Method used

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  • Optical Measurement of Displacement
  • Optical Measurement of Displacement
  • Optical Measurement of Displacement

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Embodiment Construction

[0019] Systems and methods are provided for measuring displacement with high precision and precision using reflective optical sensors. In one example, systems and methods may be used to measure displacement of a speaker cone. In various implementations, the system includes a reference detector, and a homodyne (lock-in) method is used to mitigate the effects of external noise. External noise can include power line induced noise, temperature variations, and lifetime drift. The provided systems and methods also minimize the effects of inherent electronic noise.

[0020] A system for measuring displacement consists of an optical sensor with an emitter, such as a light emitting diode (LED), two optical detectors (photodiodes), and an electronic acquisition system. Electronic acquisition systems can be used to control optical sensors. In some embodiments, the electronic acquisition system is a lock-in amplifier and digital signal processor (DSP) that senses the output of the opti...

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Abstract

The invention relates to the optical measurement of displacement. A system and method for optically measuring displacement of a component comprising: an emitter for emitting an optical signal; a first detector for detecting reflection of the optical signal from said component; a second detector of reflections of the optical signal; a processor for receiving detected reflections from said first and second detectors and using detected reflections from said second detector to remove signals from said first Distortions in reflections detected by a detector.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Patent Application Serial No. 62 / 665,328, filed May 1, 2018, which is incorporated by reference into the disclosure of this application. technical field [0003] The present invention relates to systems and methods for optical measurement of displacement. Background technique [0004] Many systems are subject to small displacements of various components, often caused by vibrations. An example is speakers. A loudspeaker is an electroacoustic transducer that converts an electrical signal into an audible audio signal. In a dynamic speaker, an electrical signal is applied to the voice coil, which then vibrates, causing a diaphragm attached to the voice coil to move, creating sound waves. [0005] In loudspeaker systems, distortion is a major limitation of large subwoofer drivers, reducing the ability of the driver to extend to deep bass frequencies. Distortion is known as the pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/02
CPCG01B11/02G01S7/497G01S17/48G01S17/50G01S17/88G01S7/48H04R23/008H04R29/001
Inventor T·雷N·J·杰克瑟N·T·科尔菲斯C·M·汉纳M·A·彻维兹
Owner ANALOG DEVICES INC