MEMS-Scanner Testbench for High Field of View LiDAR Applications

LiDAR sensors are a key technology for enabling safe autonomous cars. For highway applications, such systems must have a long range, and the covered field of view (FoV) of >45° must be scanned with resolutions higher than 0.1°. These specifications can be met by modern MEMS scanners, which are chosen for their robustness and scalability. For the automotive market, these sensors, and especially the scanners within, must be tested to the highest standards. We propose a novel measurement setup for characterizing and validating these kinds of scanners based on a position-sensitive detector (PSD) by imaging a deflected laser beam from a diffuser screen onto the PSD. A so-called ray trace shifting technique (RTST) was used to minimize manual calibration effort, to reduce external mounting errors, and to enable dynamical one-shot measurements of the scanner’s steering angle over large FoVs. This paper describes the overall setup and the calibration method according to a standard camera calibration. We further show the setup’s capabilities by validating it with a statically set rotating stage and a dynamically oscillating MEMS scanner. The setup was found to be capable of measuring LiDAR MEMS scanners with a maximum FoV of 47° dynamically, with an uncertainty of less than 1%.

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Improvement of the Accuracy of a Position-Sensitive Detector with a Wide Field of View

Technical Physics Letters ◽

10.1134/s1063785020100132 ◽

2020 ◽

Vol 46 (10) ◽

pp. 988-990

Author(s):

B. G. Podlaskin ◽

E. G. Guk ◽

A. G. Obolenskov ◽

A. A. Sukharev

Keyword(s):

Field Of View ◽

Position Sensitive Detector ◽

Wide Field ◽

Sensitive Detector ◽

Wide Field Of View ◽

Position Sensitive

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Calibration Method of Laser Detection System With Position Sensitive Detector

IEEE Aerospace and Electronic Systems Magazine ◽

10.1109/maes.2019.2956801 ◽

2020 ◽

Vol 35 (1) ◽

pp. 10-19 ◽

Cited By ~ 1

Author(s):

Tan Ju ◽

Jiyan Yu ◽

Chao Ming ◽

Xiaoming Wang ◽

Xiaohui Gu

Keyword(s):

Detection System ◽

Calibration Method ◽

Position Sensitive Detector ◽

Sensitive Detector ◽

Laser Detection ◽

Position Sensitive

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A PINHOLE SUN SENSOR FOR BALLOON-BORNE EXPERIMENT ATTITUDE DETERMINATION

Journal of Astronomical Instrumentation ◽

10.1142/s2251171713500050 ◽

2013 ◽

Vol 02 (01) ◽

pp. 1350005 ◽

Cited By ~ 3

Author(s):

A. L. KOROTKOV ◽

M.-P. ENGLISH ◽

G. S. TUCKER ◽

E. PASCALE ◽

N. GANDILO

Keyword(s):

Attitude Determination ◽

Pinhole Camera ◽

Field Of View ◽

Position Sensitive Detector ◽

The Sun ◽

Flight Performance ◽

Sensitive Detector ◽

Large Aperture ◽

Sun Sensor ◽

Position Sensitive

We report on the design, calibration and in-flight performance of a sun sensor, which is used to determine the attitude of a balloon-borne telescope. The device uses a position-sensitive detector (PSD) in a pinhole camera. By determining the position of the image of the Sun on the PSD, the orientation of the sun sensor and the boresight of the telescope relative to the Sun can be determined. The pinhole sun sensor (PSS) was first flown in the December 2010 flight of the Balloon-borne Large Aperture Submillimeter Telescope with Polarization (BLAST-Pol). In flight the PSS achieved an accuracy (combined azimuth and elevation) of about 0.18°. The accuracy could be improved by increasing the distance between the pinhole and the PSD, but the field-of-view of the PSS would be reduced.

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Hydrostatic Fiber Optic Liquid Level Sensor with position sensitive detector

Metrologiya ◽

10.32446/0132-4713.2020-4-38-51 ◽

2020 ◽

pp. 38-51

Author(s):

V. N. Astapov ◽

I. N. Kozlova

Keyword(s):

Fiber Optic ◽

Effective Area ◽

Raw Material ◽

Position Sensitive Detector ◽

Fiber Optic Sensor ◽

Liquid Level ◽

Problem Solution ◽

Sensitive Detector ◽

Position Sensitive ◽

Triangulation Sensor

This article presents the rationale and methodology for developing an intrinsically safe device, namely, a hydrostatic fiber optic sensor with a position-sensitive detector for monitoring the level of oil products in large-capacity tanks at oil depots and during pumping in a raw material warehouses. This device suitable for continuous monitoring of the liquid level, based on the measurement of a hydrostatic column of liquid with automatic offset of changes in the density of the liquid. Offset is carried out by means of a displacer (a fully submerged float), inside which a housing with a position-sensitive detector (PSD) is integrated. Theoretical validation of the bellows suspension usage for a displacer is given. During filling a container with a liquid whose level is measured, liquid bellows, the movement of which is recorded by an optical triangulation sensor using the reflected infrared ray incident on the bottom of the bellows. The principle of the triangulation sensor operation is based on the geometric properties of the triangles. The pulses of infrared radiation come through a fiber optic cable. In order to measure the movement of the surface (the bottom of the bellows) by measuring the movement of the reflected beam, a position-sensitive detector is used, which is located in a remote controller. In this device for the intrinsic safety problem solution, optical inputs of a fiber optic flat cable are located in the active zone of the sensor, which is connected to the optical inputs of a position-sensitive detector, operated on the principles of photoelectric effect. The light spot moving along the sensitive zone and converted by the detector into a one-dimensional signal proportional to the distance to the object. hydrostatically applies pressure over the entire effective area of the measuring

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Control of the phase composition of advanced calcium phosphates using an x-ray diffractometer with a curved position-sensitive detector

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2020-86-6-29-35 ◽

2020 ◽

Vol 86 (6) ◽

pp. 29-35

Author(s):

V. P. Sirotinkin ◽

O. V. Baranov ◽

A. Yu. Fedotov ◽

S. M. Barinov

Keyword(s):

Phase Composition ◽

Calcium Phosphates ◽

Position Sensitive Detector ◽

Sensitive Detector ◽

X Ray Diffraction ◽

X Ray ◽

Impurity Phases ◽

Position Sensitive ◽

Diffraction Peaks ◽

Diffraction Patterns

The results of studying the phase composition of advanced calcium phosphates Ca10(PO4)6(OH)2, β-Ca3(PO4)2, α-Ca3(PO4)2, CaHPO4 · 2H2O, Ca8(HPO4)2(PO4)4 · 5H2O using an x-ray diffractometer with a curved position-sensitive detector are presented. Optimal experimental conditions (angular positions of the x-ray tube and detector, size of the slits, exposure time) were determined with allowance for possible formation of the impurity phases during synthesis. The construction features of diffractometers with a position-sensitive detector affecting the profile characteristics of x-ray diffraction peaks are considered. The composition for calibration of the diffractometer (a mixture of sodium acetate and yttrium oxide) was determined. Theoretical x-ray diffraction patterns for corresponding calcium phosphates are constructed on the basis of the literature data. These x-ray diffraction patterns were used to determine the phase composition of the advanced calcium phosphates. The features of advanced calcium phosphates, which should be taken into account during the phase analysis, are indicated. The powder of high-temperature form of tricalcium phosphate strongly adsorbs water from the environment. A strong texture is observed on the x-ray diffraction spectra of dicalcium phosphate dihydrate. A rather specific x-ray diffraction pattern of octacalcium phosphate pentahydrate revealed the only one strong peak at small angles. In all cases, significant deviations are observed for the recorded angular positions and relative intensity of the diffraction peaks. The results of the study of experimentally obtained mixtures of calcium phosphate are presented. It is shown that the graphic comparison of experimental x-ray diffraction spectra and pre-recorded spectra of the reference calcium phosphates and possible impurity phases is the most effective method. In this case, there is no need for calibration. When using this method, the total time for analysis of one sample is no more than 10 min.

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