Investigation of positioning algorithm and method for increasing the linear measurement range for four-quadrant detector

Chen, Mengwei; Yang, Yingping; Jia, Xiaojun; Hong-yun, Gao

doi:10.1016/j.ijleo.2013.06.010

Cited by 43 publications

(19 citation statements)

References 8 publications

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“…11); its center should align to the center of AUV; its sensitive plane should directly face the front of AUV. Chen et al (2013) and Hao et al (2012) recommend that when the size of light spot on the sensitive plane is half of the quadrant detector's sensitive area, the optical system has the best performance. To make the optical system work normally, a convex lens is fixed in front of the detector.…”

Section: Optical Quadrant Detectormentioning

confidence: 99%

RETRACTED: An autonomous underwater vehicle docking system based on optical guidance

Tang

Nie

2015

Ocean Engineering

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Section: Optical Quadrant Detectormentioning

confidence: 99%

RETRACTED: An autonomous underwater vehicle docking system based on optical guidance

Tang

Nie

2015

Ocean Engineering

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“…For the improved new estimation method, only one parameter effective radius

is introduced. Compared with the method mentioned in Reference [ 24 ], the new method has less parameters, which are more suitable for practical applications.…”

Section: Resultsmentioning

confidence: 99%

High Precision Position Measurement Method for Laguerre-Gaussian Beams Using a Quadrant Detector

Chen

et al. 2018

Sensors

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In this paper, we propose a new method to improve the position measurement accuracy for Laguerre-Gaussian beams on a quadrant detector (QD). First, the error effects of the detector diameter and the gap size are taken into account, and the position error compensation factor is introduced into the conventional formula. Then, in order to reduce the number of parameters, the concept of effective radius is proposed. Thus, a new analytical expression is obtained with a best fit using the least square method. It is verified by simulation that this approach can reduce the maximum error by 97.4% when the beam radius is 0.95 mm; meanwhile, the root mean square errors under different radii are all less than 0.004 mm. The results of simulation show that the new method could effectively improve the accuracy of the QD measurement for different radii. Therefore, the new method would have a good prospect in the engineering practice of beam position measurements.

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“…The traditional direct detection method, as described previously in References [4,6,7], is shown in Figure 2. As we can see in Figure 2, the four output electrical signals are sent to low pass filters (LPF) first.…”

Section: Direct Detection Methodsmentioning

confidence: 99%

“…Dang and colleagues analyzed the characteristics of the detector output signal [6]. The estimated spot position values and the real spot position values were calibrated by Chen and colleagues, the calibrated values then fitted to the polynomial [7]. This method is similar to the Boltzmann function method, the main difference being the greater complexity of the function employed in the method proposed by Chen and colleagues.…”

Section: Introductionmentioning

confidence: 99%

High-Precision Light Spot Position Detection in Low SNR Condition Based on Quadrant Detector

et al. 2019

Applied Sciences

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In free space optical communications, long-distance transmission leads to the attenuation of beacon light, where we adopt a quadrant detector (QD) to receive the weak signal. However, the background light interferes so strongly that the output signal-to-noise ratio (SNR) of QD is at a low level, which causes a decrease in accuracy of the direct detection method. This requires finding a new light spot detection method, so an improved detection method is proposed. Because the dark current noise and the background light noise are both white noise, we adopt a Kalman filter to estimate the real output of four electric signals of QD. Unfortunately, running these through an amplifier introduces some direct current (DC) offsets into the signals. In order to balance the effect of the DC offsets, we consider using the modulation method, where we employ a sine signal to modulate the intensity of the beacon light at the transmitting end, after which we can give an inverse gain to move the center of signals to near zero to eliminate the DC offsets when we calculate the data. In Kalman filtering, we use the peak values of the signals in every period after the analog to digital converter (ADC) as the elements of the measurement matrix. Experimental results show that even when QD output SNR is about −10 dB, the detection root-mean-square errors decrease by 51.5% using the improved detection method compared with the direct detection method. Moreover, Kalman filtering does not require a large amount of data, which means it works efficiently, can reduce the cost of hardware resources, and is available for the real-time calculation of spot position.

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Investigation of positioning algorithm and method for increasing the linear measurement range for four-quadrant detector

Cited by 43 publications

References 8 publications

RETRACTED: An autonomous underwater vehicle docking system based on optical guidance

RETRACTED: An autonomous underwater vehicle docking system based on optical guidance

High Precision Position Measurement Method for Laguerre-Gaussian Beams Using a Quadrant Detector

High-Precision Light Spot Position Detection in Low SNR Condition Based on Quadrant Detector

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