Extended the linear measurement range of four-quadrant detector by using modified polynomial fitting algorithm in micro-displacement measuring system

Vo, Quangsang; Zhang, Xiaodong

doi:10.1016/j.optlastec.2018.11.036

Cited by 31 publications

(9 citation statements)

References 11 publications

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“…The proposed precision level was calibrated by a commercial autocollimator (AutoMAT Co. model 5000U; resolution: 0.01 arc-sec; accuracy: ±0.1 arc-sec; repeatability: 0.05 arc-sec; uncertainty: 0.119 arc-sec). It is known that the output signal of QPD will show obvious nonlinearity in a large range [22]. In order to obtain the most suitable linear sensitivity coefficient on different measurement ranges, the two inclined directions of the dual-axis precision level were calibrated for the different measurement ranges of ±100 arc-sec, ±400 arc-sec, and ±800 arc-sec, separately.…”

Section: Calibration Resultsmentioning

confidence: 99%

An Innovative Dual-Axis Precision Level Based on Light Transmission and Refraction for Angle Measurement

et al. 2020

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Currently, the widely used pendulum-type precision level cannot be miniaturized because reducing the size of the pendulum will reduce its displacement so as to decrease the measurement accuracy and resolution. Moreover, the commercial pendulum-type level can only sense one direction. In this paper, an innovative compact and high-accuracy dual-axis precision level is proposed. Based on the optical principle of light refraction and the reference of the invariant liquid level, the pendulum is no more needed. In addition, based on the light transmission design, there is no reflection signal to interfere with the true signal. Therefore, the level can achieve a high accuracy and small-sized design. The calibration result shows the error of the proposed precision level is better than ±0.6 arc-sec in the measurement range of ±100 arc-sec, and better than ±5 arc-sec in the full measurement range of ±800 arc-sec.

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Section: Calibration Resultsmentioning

confidence: 99%

An Innovative Dual-Axis Precision Level Based on Light Transmission and Refraction for Angle Measurement

et al. 2020

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“…Phase Kinoform [25] 100.0 32-Level [5,6,29,30] 99.7 16-Level [5,6,29,30] 98.7 8-Level [5,6,29,30] 95.0 4-Level [5,6,29,30] 81.1 2-Level [15,25] 40.5 Sinusoidal [25] 33.9 Amplitude 2-Level [27,33] 10.1 Sinusoidal [25][26][27][28] 6.25…”

Section: Types Diffractive Lenses Efficiency (%)mentioning

confidence: 99%

“…The researchers, Liu et al [32], Liang et al [20], Vo et al [33], Li et al [34], Aguilar et al [35], Zhang et al [36], Chen et al [37], Ünal et al [1], and Zhang et al [38], have conducted various investigations related to the beam size on 4-quadrant detectors, enhancing the linear measurement range, studying the measurement sensitivity of Gaussian and Laguerre-Gaussian beams on 4-quadrant detectors, expanding the linear measurement range, and examining the effects of a non-uniform spot on 4-quadrant detectors.…”

Section: Introductionmentioning

confidence: 99%

Laser seeker design with multi-focal diffractive lens

Ünal

2023

Eng. Res. Express

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Diffractive optical elements are increasingly favoured due to their ability to provide numerous design freedoms by adjusting the Fresnel regions. The design freedoms make it possible to meet multiple system functions in electro-optical systems simultaneously by using a single optical element. This research introduces a novel laser seeker design with a multi-focal diffractive lens that enhances a laser seeker’s measurement sensitivity and linear measurement range. The development of the multi-focal combined lens, featuring two distinct regions with unique focal lengths, aims to simultaneously fulfill two system functions within the laser seeker. The central region of the lens is intended for adjusting the linear measurement range, while the outer region is utilized to regulate the measurement sensitivity of the seeker. The numerical optical wave propagation method was employed to simulate the behaviour of the laser seeker with a multi-focal diffractive lens, and the combined diffractive lens was compared to an ideal lens in the scope of laser seeker application. The simulation results indicate that the measurement sensitivity of the seeker has been increased between 0° to ±3° angular incidence, and the linear measurement range has been increased from ±18° to ±26°. The findings of this study contribute to the advancement of multi-focal diffractive lenses, which fulfil multiple functions within an electro-optical system concurrently.

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“…Laser light sources used in laser spot trackers generally employ pulse lasers operating from several Hz to tens of Hz, and laser receivers consist of a photodetector with an optical system, four photodiode arrays, and an amplifier that converts photocurrents into voltage and amplifies the voltage. [5][6][7] Although a constant signal can be acquired using a laser spot tracker at a fixed condition indoors, the laser signal received may vary according to the performance and position of the laser spot tracker and transmitter, target size, reflectance and angle, atmospheric conditions, and solar spectral irradiance using a laser spot tracker outdoors. In particular, solar spectral irradiance diminishes the detection range because it produces noise in addition to the hardware noise of the laser spot tracker.…”

Section: Introductionmentioning

confidence: 99%

Effects of solar noise on the detection range performance of a laser spot tracker

2021

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The effects of solar spectral irradiance on the performance of laser spot tracker are analyzed. When the entrance pupil diameter of the receiver increases, the field of view decreases, but the detection range increases. If the angle between the receiver and transmitter and target increases from 0 deg to 60 deg, the detection range decreases by approximately 23%. Due to solar noise's effects caused by solar spectral irradiance, the detection range decreases by approximately 33% during the day, more than during the night, and the laser spot tracker's altitude decreases by approximately 13% at 2000 m, more than at 0 m. When the solar intensity's variation increases from 1% to 5%, the detection range decreases by 54%.

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Extended the linear measurement range of four-quadrant detector by using modified polynomial fitting algorithm in micro-displacement measuring system

Cited by 31 publications

References 11 publications

An Innovative Dual-Axis Precision Level Based on Light Transmission and Refraction for Angle Measurement

An Innovative Dual-Axis Precision Level Based on Light Transmission and Refraction for Angle Measurement

Laser seeker design with multi-focal diffractive lens

Effects of solar noise on the detection range performance of a laser spot tracker

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