Improved performance of a refurbished photoelectric autocollimator

Astrua, Milena; Pisani, Marco

doi:10.1088/1361-6501/abaf6f

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…The accuracy and resolution of the autocollimator detection primarily rely on the sensitivity of the sensor [ 205 ]. It is imperative to minimize the noise level of the sensor signal in order to achieve high-resolution angular displacement measurement [ 206 , 207 , 208 ]. The method of self-collimation has maintained enduring popularity and continues to be utilized, with the development of numerous diverse variations over time [ 171 , 173 , 178 , 209 , 210 , 211 , 212 , 213 , 214 , 215 , 216 , 217 , 218 , 219 , 220 , 221 , 222 , 223 , 224 , 225 , 226 , 227 ].…”

Section: High Precision With Multiple Axesmentioning

confidence: 99%

A Review: High-Precision Angle Measurement Technologies

Wang,

Ma,

Cao

et al. 2024

Sensors

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Angle measurement is an essential component of precision measurement and serves as a crucial prerequisite for high-end manufacturing. It guides the implementation of precision manufacturing and assembly. The current angle measurement methods mainly focus on multiple axes, high precision, and large measurement ranges. This article introduces the technology of angle measurement from the perspectives of single-axis and multi-axis measurement schemes. Firstly, the single-axis measurement scheme is primarily achieved through optical methods, such as encoder discs that measure energy changes and interferometric phase changes, as well as mechanical, electromagnetic, and inertial angle measurement methods, among which interferometric methods offer the highest accuracy, with high cost, and encoder discs provide the largest measurement range with an ordinary price. Secondly, in the multi-axis measurement scheme, autocollimation instruments, including plane mirrors, gratings, and self-designed targets, are the main options. Although grating encoders can achieve three degrees of freedom in angle measurement with an ordinary price, they are limited in terms of measurement range and sensitivity compared to self-designed targets. Lastly, artificial intelligence assistance precision measurement is increasingly being embraced due to significant advancements in computer performance, making it more convenient to identify the relationship between measured values and detection values. In conclusion, angle measurement plays a crucial role in precision manufacturing, and the evolving and improving technologies provide the manufacturing industry with greater choices. The purpose of this review is to help readers quickly find more suitable technical solutions according to current application requirements, such as single/multiple axes, accuracy level, measuring range, budget, etc.

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Section: High Precision With Multiple Axesmentioning

confidence: 99%

A Review: High-Precision Angle Measurement Technologies

Wang,

Ma,

Cao

et al. 2024

Sensors

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“…As a results of the calibration procedure, the angle sensitivity of the autocollimator was measured equal to 1.6921 px arcsec −1 with a relative uncertainty equal to 1.0 • 10 −4 on a measurement range of 150 µrad. Further details on the autocollimator performances and calibration can be found in [14].…”

Section: Experimental Set-upmentioning

confidence: 99%

Calibration of high accuracy accelerometers for ESA missions BepiColombo and JUICE at INRIM

Astrua

Pisani

Santiano

et al. 2023

Meas. Sci. Technol.

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High sensitive triaxial accelerometers are used in several space missions to measure the non-gravitational accelerations acting on the spacecraft. Among these, the capacitive accelerometers developed for ESA missions JUICE and BepiColombo were designed to measure accelerations of the order of 3∙10-6 m/s2 with an accuracy level of 300 ppm in the frequency range (3·10-5 - 0.1) Hz. Despite the signal to be be measured is of the same order of magnitude of the seismic noise on the earth, an accurate on-ground calibration is needed.The facility set-up at INRIM to this purpose is based on a simple principle: the base of the accelerometer is dinamically tilted by an angle α so that the sensor undergoes a component of the gravitational acceleration g proportional to angle α. In practice, several issues have to be addressed by the calibration facility, such as the seismic noise limiting the signal-to-noise ratio, the generation and the accurate measurement of the tilt angle. Furthermore, the calibration was performed taking into account different on-flight conditions such as different operating temperatures and possible deformation of the accelerometers during the launch. The experimental set-up and the calibration procedure are described in the paper. The measurement results and the uncertainty budget show that a relative accuracy of 240 ppm has been achieved.

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“…For photoelectric autocollimation [ 10 ], the collimated light beam is detected by a photodetector after being reflected by a plane mirror [ 11 , 12 , 13 , 14 , 15 ]. A change in the pitch angle leads to a rotation of the mirror, which results in a change in the reflection direction of the reflected beam.…”

Section: Introductionmentioning

confidence: 99%

An Ultracompact Angular Displacement Sensor Based on the Talbot Effect of Optical Microgratings

Yang

et al. 2023

Sensors

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Here, we report an ultracompact angular displacement sensor based on the Talbot effect of optical microgratings. Periodic Talbot interference patterns were obtained behind an upper optical grating. By putting another grating within the Talbot region, the total transmission of the two-grating structure was found to be approximatively in a linear relationship with the relative pitch angle between the two gratings, which was explained by a transversal shift of the Talbot interference patterns. The influence of the grating parameters (e.g., the grating period, the number of grating lines and the gap between the two gratings) was also studied in both a simulation and an experiment, showing a tunable sensitivity and range by simply changing the grating parameters. A sensitivity of 0.19 mV/arcsec was experimentally obtained, leading to a relative sensitivity of 0.27%/arcsec within a linear range of ± 396 arcsec with the 2 μm-period optical gratings. Benefitting from tunable properties and an ultracompact structure, we believe that the proposed sensor shows great potential in applications such as aviation, navigation, robotics and manufacturing engineering.

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Improved performance of a refurbished photoelectric autocollimator

Cited by 6 publications

References 13 publications

A Review: High-Precision Angle Measurement Technologies

A Review: High-Precision Angle Measurement Technologies

Calibration of high accuracy accelerometers for ESA missions BepiColombo and JUICE at INRIM

An Ultracompact Angular Displacement Sensor Based on the Talbot Effect of Optical Microgratings

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