A Novel Dual-Differential Edge Sensor Based on the Eddy Current Effect

Zhao, Guofeng; Feng, Zhi Hua; Ni, Jijun

doi:10.1109/jsen.2023.3240175

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Among these vectors,

and

are orthogonal vectors within segment 1, which are conjugate to the local coordinate system. The segmented mirrors can be theoretically viewed as rigid bodies [ 15 ], and their orientation vectors can be described as:

…”

Section: Segmented Active Control Analysismentioning

confidence: 99%

“…Among these vectors, 𝑝 ⃗ and 𝑝 ⃗ are orthogonal vectors within segment 1, which are conjugate to the local coordinate system. The segmented mirrors can be theoretically viewed as rigid bodies [15], and their orientation vectors can In order to address the challenges posed by the Keck-type layout, we have developed a new sensor layout scheme, depicted on the right side of Figure 3. In this scheme, the two edge sensors are positioned on the circular centerline of adjacent sub-mirrors.…”

Section: The Layout Of the Edge Sensor Structurementioning

confidence: 99%

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A Novel Tandem Differential Edge Sensor Layout for Segmented Mirror Telescopes

Huo,

Yang,

Wang

et al. 2023

Sensors

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The performance of an active control system, crucial for the co-phase maintenance of segmented mirrors, is closely related to the spatial layout of sensors and actuators. This article compares two types of edge sensor layouts, vertical and horizontal, and proposes a novel tandem differential sensor layout that saves layout space and reduces the number of positioning references. The control performance of this scheme is analyzed in terms of error propagation, mode representation, and the scalable construction of the control matrix. Finally, we constructed a tandem differential-based sensor detection system to examine the performance of edge sensors and the effect of laboratory environmental variables on sensor measurements. Simulations and experiments demonstrate that this scheme has the same ability to fully characterize actuator modification modes as the Keck edge sensor layout. Although the total error multiplier is slightly larger than the latter, it has fewer scalable control matrix types and stronger spatial and segmental shape adaptation capabilities. Actual measurements show that the sensor’s own noise in a tandem differential layout is less than 20 nm, which meets the requirements for future segmented co-phase maintenance. This layout type can potentially be applied to future small and medium-sized segmented splices.

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“…Among these vectors,

and

…”

Section: Segmented Active Control Analysismentioning

confidence: 99%

Section: The Layout Of the Edge Sensor Structurementioning

confidence: 99%

A Novel Tandem Differential Edge Sensor Layout for Segmented Mirror Telescopes

Huo,

Yang,

Wang

et al. 2023

Sensors

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“…The mechanical modification aspects are restricted to only a few numbers of sensors [13,14]. For example, the edge sensor designed in [15] based on the eddy current effect is able to reduce the temperature drift-related error for a broad range of temperatures for telescope applications. Similarly, the algorithm-based thermal drift compensation depends on robust calibration with minute accuracy, which is challenging to achieve measurement with transient responses [11,16,17].…”

Section: Introductionmentioning

confidence: 99%

Amplitude modulated feed-forward thermal drift compensation for linear and nonlinear current sensors

Ranasingh

Pradhan

Raju

2023

Meas. Sci. Technol.

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The linear and nonlinear temperature responses restrict the application of Hall current sensors operating in thermal power plants and industries. The rise in temperature of electron device-based measurement causes a significant error, leading to undesirable consequences for plant operation and relay coordination. This paper investigates four Hall current sensor types with linear and nonlinear temperature responses. The Hall current sensor, which receives the magnetic excitation from the permanent magnet, exhibits a linear temperature response, and the wire-wound design exhibits a nonlinear temperature response in the temperature range of 306-376K. The solution scheme with amplitude modulation and thermal sensor integration with interdigitated electrode design having graphene and ZnO- KMnO4 compounds as the dielectric is also proposed. The use of amplitude modulation achieves input frequency immunity with a 0.03%/K improvement in the temperature response of the capacitive thermal sensor. Experimental observations confirm the validity of the thermal drift compensation scheme with a 20-99% reduction of thermal drift error with a suitable choice of a thermal sensor.

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