Design and analysis of displacement measurement system based on the four-quadrant detector

Gao, Zijun; Dong, Lili; Xu, Wenhai

doi:10.1117/12.2040172

Cited by 3 publications

(1 citation statement)

References 4 publications

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“…In a previous paper [1], we demonstrated that the technique was capable of sensing lateral movements of less than 0.3 μm in air with the detector. This is consistent with other published results [23,24] and commercial products [25]. If the optical lever arm has a length z 0.25 m, the minimum detectable beam deflection is 68 μdeg.…”

Section: Detection Sensitivitysupporting

confidence: 92%

Frequency response of optical beam deflection by ultrasound in water

Caron

DiComo

2014

Appl. Opt.

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Acoustic waveforms create fluctuations in the index of refraction of the medium. An optical beam passing through the disturbance will be deflected or displaced from the original path. The acoustic wave can be detected by sending a laser through the disturbance and sensing the path changes of the beam with a position-sensitive photodetector. This paper presents a model of this interaction in water to predict the sensitivity and frequency response. The model demonstrates that the frequency response of the system is broadband, allowing detection from a few hundred hertz to 20 MHz. This technique has potential use for underwater acoustic sensing and ultrasonic inspection of materials.

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Section: Detection Sensitivitysupporting

confidence: 92%

Frequency response of optical beam deflection by ultrasound in water

Caron

DiComo

2014

Appl. Opt.

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Detection of the angle-of-arrival of an optical beam by means of interference optical filters for free-space optical communication

Želudevičius¹,

Dubosas²,

Švedas³

et al. 2022

Appl. Opt.

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We propose a method for estimating the angle-of-arrival of an optical beam, which is based on angle-dependent properties of interference optical filters. One-filter and two-filter configurations for beam angle detection in one plane were investigated experimentally. By using off-the-shelf interference filters and a laser beam with a 4 nm broad spectrum at a 1030 nm center wavelength, an angle detection range of 1.6°–2.3° was achieved with an angle detection uncertainty standard deviation of <2016

Appl. Opt.

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A type of laser semiactive angle measurement system is designed for target detecting and tracking. Only one detector is used to detect target location from four distributed aperture optical systems through a 4×1 imaging fiber bundle. A telecentric optical system in image space is designed to increase the efficiency of imaging fiber bundles. According to the working principle of a four-quadrant (4Q) detector, fiber diamond alignment is adopted between an optical system and a 4Q detector. The structure of the laser semiactive angle measurement system is, we believe, novel. Tolerance analysis is carried out to determine tolerance limits of manufacture and installation errors of the optical system. The performance of the proposed method is identified by computer simulations and experiments. It is demonstrated that the linear region of the system is ±12°, with measurement error of better than 0.2°. In general, this new system can be used with large field of view and high accuracy, providing an efficient, stable, and fast method for angle measurement in practical situations.

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Design and analysis of displacement measurement system based on the four-quadrant detector

Cited by 3 publications

References 4 publications

Frequency response of optical beam deflection by ultrasound in water

Frequency response of optical beam deflection by ultrasound in water

Detection of the angle-of-arrival of an optical beam by means of interference optical filters for free-space optical communication

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