A CMOS monolithic calibrated position-sensitive detector (PSD) for detecting light-spot position applications

Chiang, Cheng‐Ta; Hou, Yu-Ting

doi:10.1109/icma.2016.7558675

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…As a typical Gaussian light source, the laser bean produces a light spot with uneven energy distribution when projected onto the photosensitive surface of PSD [27]. At steady state, PSD can continuously detect the gravity center position of the laser spot which is independent of the size of the spot and the energy distribution of the light source [5], [28]. When the laser rotates around a fixed axis, the continuous trace of PSD can be approximately circular curve and the center of the circle should be the actual center of the laser bean.…”

Section: Laser Center Positioning By the Means Of Rotating A Design Of Rotating Laser Systemmentioning

confidence: 99%

Position Measurement of Laser Center by Using 2-D PSD and Fixed-Axis Rotating Device

et al. 2019

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Photoelectric non-contact measurement methods have been widely implemented in space target location, micro-displacement measurement and space optical communication. In term of the reliability and precision of measurement systems, it is a great significance to obtain the laser center location accurately. Since the two-dimensional position sensitive detector (2-D PSD) can continuously detects the gravity center position of the laser spot on its photosensitive surface, this paper provides a flexible method with high precision for the nonlinear correction of PSD as well as a new idea for PSD-based moving laser center positioning. Above all, a laser device system that rotating around a fixed-axis is designed, and the rotation angle can be controlled with the rotation accuracy of 0.5 • . The trace of the gravity center of the rotating spot generated by the device on the PSD surface is detected, and then the laser center location is obtained after further processing of data. In order to improve the detection accuracy of PSD, this research mainly focuses on the nonlinear correction method of the detector and the fitting method of the gravity center trace of the laser spot. Moreover, the effects of different sizes of light spots projected onto the 2-D PSD on the collected photocurrent and estimated coordinates were analyzed by experiments. From the experimental results, the non-linear error of PSD is corrected by the error curved surface interpolation method, the overall error is reduced by more than 32%, and the linearity of the positioning of the laser moving along the diagonal of PSD is 0.2%.

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Section: Laser Center Positioning By the Means Of Rotating A Design Of Rotating Laser Systemmentioning

confidence: 99%

Position Measurement of Laser Center by Using 2-D PSD and Fixed-Axis Rotating Device

et al. 2019

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“…Today, sensor and monitoring systems [1], [2] have seen rapid growth in demand as most current technology incorporates sensors into many different fields such as the automotive field [3], medical field [4], robotics [5], measuring instruments and much more. According to a report published in 'Global Markets and Technologies for Sensors' on July 2014, the global market of sensors are going to keep increasing and is expected to raise exponentially in the next decade [6].…”

Section: Introductionmentioning

confidence: 99%

Optional CMOS based Monolithic Light Sensor for Detection of Light Intensity

Kean,

Mat Jubadi,

Ahmad

2021

IJIE

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Conventional light intensity sensing devices such as a light meter are big in size and incapable of outputting a digitized signal to a microprocessor for further control and actuation. Sensor transducers based on CMOS has therefore increased in popularity. Using CMOS technology, manufacturing costs and the power consumption can be reduced with smaller form factor. This paper presents a proposed design of light sensor for the detection of light intensity. The project utilizes Silterraâ€™s 130 nm CMOS architecture to create a low power and low space monolithic light sensor chip that is able to detect the intensity of light to assist in achieving the recommended levels of light intensity in domestic areas. The light intensity was simulated with a photocurrent and the photodiode operates optimally at a wavelength of 555 nm, the spectral sensitivity of the human eye and has good linearity. The light intensity detected is shown in illuminance (lux) and this project is capable to detect illuminance in the range of 0 to 200 lux with a resolution of 20 lux. The monolithic chip of the light intensity sensor comprises of the transimpedance amplifier which acts as a current to voltage converter and an ADC to convert the analog voltage into a digital reading. Hence, the output of the light intensity sensor is in binary representation. The total power consumption of the monolithic light intensity sensor is 1.88mW and the total size of the design is 0.01202 mm2.

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“…Despite dedicated and carefully optimized technology, the position sensing accuracy and sensitivity of LEPs are poorer than those of photodetector arrays such as CCDs [2]. This has led investigations in using the CMOS monolithic calibrated position-sensitive detectors [3]. Another application of these PSD in techniques including Laser Scanning Microscopy [4] [5].…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

International Journal of Innovative Research in Electrical, Ele

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A microscopy system has been introduced based on a Position Sensitive Detector (PSD). In our previous research, the geometric error factors that are caused by the pincushion-type distortion of these sensors were investigated and were addressed to significantly reduce Signal to Noise Ratio (SNR) in PSD and the microscopy system. The algorithm used for the microscopy system can be also further improved to achieve a high-precision system based on localized differential method. This approach was implemented in this research resulting in significant improvement in the precision of the microscopy system.

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A CMOS monolithic calibrated position-sensitive detector (PSD) for detecting light-spot position applications

Cited by 6 publications

References 11 publications

Position Measurement of Laser Center by Using 2-D PSD and Fixed-Axis Rotating Device

Position Measurement of Laser Center by Using 2-D PSD and Fixed-Axis Rotating Device

Optional CMOS based Monolithic Light Sensor for Detection of Light Intensity

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