A Fully Differential Charge-Sensitive Amplifier for Dust-Particle Detectors

Kelz, Sebastian; Veigel, Thomas; Berroth, Manfred

doi:10.1109/prime.2018.8430334

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…amplifiers in the literature. The singled-ended charge amp inside the ELectrostatic Dust Analyzer (ELDA) [18,19] used an LTC6240 and performed similarly to our design, while Kelz et al [20] created a fully-integrated differential charge amp with excellent noise performance.…”

Section: Specificationsmentioning

confidence: 99%

“…We test our sensors in fresh-frozen cadaveric human temporal bones (no chemical preservatives) and conduct all measurements inside a soundproof and electrically isolated room at [18,19] 57 aC 5 pF 7 Hz-10 kHz Kelz et al [20] 18 aC 5.4 pF 7 Hz-300 kHz Figure 9 shows our temporal bone test setup. A 3D-printed clamp holds the UmboMic sensor under the umbo while a stiff and transparent plastic window almost seals the ear canal.…”

Section: Measurement Techniquesmentioning

confidence: 99%

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The UmboMic: a PVDF cantilever microphone ^*

Yeiser,

Wawrzynek,

Zhang

et al. 2024

J. Micromech. Microeng.

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Objective: We present the “UmboMic,” a prototype piezoelectric cantilever microphone designed for future use with totally-implantable cochlear implants. Methods: The UmboMic sensor is made from polyvinylidene difluoride (PVDF) because of its low Young’s modulus and biocompatibility. The sensor is designed to fit in the middle ear and measure the motion of the underside of the eardrum at the umbo. To maximize its performance, we developed a low noise charge amplifier in tandem with the UmboMic sensor. This paper presents the performance of the UmboMic sensor and amplifier in fresh cadaveric human temporal bones. Results: When tested in human temporal bones, the UmboMic apparatus achieves an equivalent input noise of 32.3 dB SPL over the frequency range 100 Hz to 7 kHz, good linearity, and a flat frequency response to within 10 dB from about 100 Hz to 6 kHz. Conclusion: These results demonstrate the feasibility of a PVDF-based microphone when paired with a low-noise amplifier. The reported UmboMic apparatus is comparable in performance to a conventional hearing aid microphone. Significance: The proof-of-concept UmboMic apparatus is a promising step towards creating a totally-implantable cochlear implant. A completely internal system would enhance the quality of life of cochlear implant users.

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Section: Specificationsmentioning

confidence: 99%

Section: Measurement Techniquesmentioning

confidence: 99%

The UmboMic: a PVDF cantilever microphone ^*

Yeiser,

Wawrzynek,

Zhang

et al. 2024

J. Micromech. Microeng.

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“…The electrodes and CSAs are mounted in a 100 mm vacuum pipe with standard CF 100 flange interfaces. The design of the differential CSA is based on an improved version of the design presented in reference [19]. While traditional CSAs evaluate the influenced charge of a single electrode with reference to ground, the detector presented in this paper contains two electrodes and evaluates the charge difference between both electrodes.…”

Section: Dust Detector Upgradementioning

confidence: 99%

Upgrades of a Small Electrostatic Dust Accelerator at the University of Stuttgart

Bauer

Kelz

et al. 2023

Applied Sciences

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In this paper, we describe the upgrade of a small electrostatic dust accelerator located at the University of Stuttgart. The newly developed dust source, focusing lens, differential detector and linac stage were successfully installed and tested in the beam line. The input voltage range of the dust source was extended from 0–20 kV to 0–30 kV. A newly developed dust detector with two differential charge sensitive amplifiers is employed to monitor particles with speeds from several m/s to several km/s and with surface charges above 0.028 fC. The post-stage linac provides an additional acceleration ability with a total voltage of up to 120 kV. The entire system of this dust accelerator works without protection gas and without a complex high voltage terminal. The volumes to be pumped down are small and can be quickly evacuated. The new system was used to accelerate micron- and submicron-sized metal particles or coated mineral materials. Improvements in the acceleration system allow for a wider variety of dust materials and new applications.

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