Inductive edge sensors: an innovative solution for ELT segmented mirror alignment monitoring

Rozière, Didier; Luong, Bruno; Fuchs, Bernard; Périn, Ambroise; Néel, Christian; Lévêque, S.

doi:10.1117/12.789444

Cited by 12 publications

(7 citation statements)

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“…As indicated in Figure a, the sensor or the sensor array was put on the different positions of one author's body to detect different physiological signals. Detecting the respiration rates is very important as many disorders, such as asthma and sleep apnea, may exhibit abnormal respiration rates . Figure b shows the weak breath and deep breath signals when the sensor was attached on the place between the upper lip and the nose (Figure a).…”

Section: Resultsmentioning

confidence: 99%

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Tang

Gan

et al. 2019

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Flexible pressure sensors as electronic skins have attracted wide attention to their potential applications for healthcare and intelligent robotics. However, the tradeoff between their sensitivity and pressure range restricts their practical applications in various healthcare fields. Herein, a cost‐effective flexible pressure sensor with an ultrahigh sensitivity over an ultrawide pressure‐range is developed by combining a sandpaper‐molded multilevel microstructured polydimethylsiloxane and a reduced oxide graphene film. The unique multilevel microstructure via a two‐step sandpaper‐molding method leads to an ultrahigh sensitivity (2.5–1051 kPa−1) and can detect subtle and large pressure over an ultrawide range (0.01–400 kPa), which covers the overall pressure regime in daily life. Sharp increases in the contact area and additional contact sites caused by the multilevel microstructures jointly contribute to such unprecedented performance, which is confirmed by in situ observation of the gap variations and the contact states of the sensor under different pressures. Examples of the flexible pressure sensors are shown in potential applications involving the detection of various human physiological signals, such as breathing rate, vocal‐cord vibration, heart rate, wrist pulse, and foot plantar pressure. Another object manipulation application is also demonstrated, where the material shows its great potential as electronic skin intelligent robotics and prosthetic limbs.

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Section: Resultsmentioning

confidence: 99%

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Tang

Gan

et al. 2019

Small

186

174

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“…The 24 inductive PSs installed in WEB have worked with an acceptable noise, up to the limits that can be measured in WEB. The insensitivity to dust and condensation described in [4] has not been deeply explored but when being near such conditions the noise has not increased substantially. The improvable aspect of PSs is its reliability.…”

Section: Position Sensorsmentioning

confidence: 96%

“…The Position Sensors (PS) of WEB are described in [4]. The 24 inductive PSs installed in WEB have worked with an acceptable noise, up to the limits that can be measured in WEB.…”

Section: Position Sensorsmentioning

confidence: 99%

First results of the wind evaluation breadboard for ELT primary mirror design

2010

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The Wind Evaluation Breadboard (WEB) is a primary mirror and telescope simulator formed by seven aluminium segments, including position sensors, electromechanical support systems and support structures. WEB has been developed to evaluate technologies for primary mirror wavefront control and to evaluate the performance of the control of wind buffeting disturbance on ELT segmented mirrors. For this purpose WEB electro-mechanical set-up simulates the real operational constrains applied to large segmented mirrors. This paper describes the WEB assembly, integration and verification, the instrument characterisation and close loop control design, including the dynamical characterization of the instrument and the control architecture. The performance of the new technologies developed for position sensing, acting and controlling is evaluated. The integration of the instrument in the observatory and the results of the first experiments are summarised, with different wind conditions, elevation and azimuth angles of incidence. Conclusions are extracted with respect the wind rejection performance and the control strategy for an ELT. WEB has been designed and developed by IAC, ESO, ALTRAN and JUPASA, with the integration of subsystems of FOGALE and TNO.

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“…This may be done either with capacitive or inductive discrete edge sensors as in segmented primary mirrors [16,17], or with various optical sensors [18][19][20] that give a more or less averaged measure of the phasing error along the segment edge (see Fig. 3).…”

Section: Control Strategymentioning

confidence: 99%

Segmented bimorph mirrors for adaptive optics: morphing strategy

et al. 2014

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This paper discusses the concept of a light weight segmented bimorph mirror for adaptive optics. It focuses on the morphing strategy and addresses the ill-conditioning of the Jacobian of the segments, which are partly outside the optical pupil. Two options are discussed, one based on truncating the singular values and one called damped least squares, which minimizes a combined measure of the sensor error and the voltage vector. A comparison of various configurations of segmented mirrors was conducted; it is shown that segmentation sharply increases the natural frequency of the system with limited deterioration of the image quality.

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Inductive edge sensors: an innovative solution for ELT segmented mirror alignment monitoring

Cited by 12 publications

References 0 publications

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

First results of the wind evaluation breadboard for ELT primary mirror design

Segmented bimorph mirrors for adaptive optics: morphing strategy

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