Alexander Anton Altmann

Alexander Anton Altmann
Technical University of Darmstadt | TU · Department of Electrical Engineering and Information Technology (Dept.18)

Master of Science
Research Associate

About

27
Publications
1,543
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72
Citations
Introduction
Flexible sensors based on additively manufactured ferroelectrets and their human applications; 3D printing and manufacturing of functional materials for use as sensors

Publications

Publications (27)
Article
The temporomandibular joint (TMJ) is one of the most complex joints in the human body, but its biomechanics have not been as extensively researched as other body joints, leading to a fundamental gap in understanding the physiological characteristics and diagnostics of related disorders. This work introduces a measurement system that applies a preci...
Article
Full-text available
Piezoelectret metamaterials are a kind of piezoelectrets with distinctive properties such as negative Poisson's ratio and positive piezoelectric d31 coefficient. These materials hold significant promise for applications in sensing and mechanical energy harvesting. In this article, flexible piezoelectret metamaterials with a simple double-V cell str...
Conference Paper
Full-text available
Rotational energy harvesters have emerged as a promising solution for sustainable power generation in a variety of applications, ranging from small-scale devices to large-scale industrial systems. In this work, we present a fully 3D-printed electret rotational harvester based on the biodegradable and compostable polymer polylactic acid (PLA). The 3...
Article
In view of the global ecosystem crisis resulting from the ubiquitous electronic waste (e􀀀 and plastic waste), the engineering of advanced electronic devices from sustainable materials is gaining considerable attention. Nevertheless, the development of advanced, maybe even degradable electronics with comparable or even improved functionality remains...
Conference Paper
Full-text available
Flexible sensors based on ferroelectrets can utilize the full potential of the widely adopted 3D printing process, capitalizing on its accessibility, freedom of design, and range of materials. However, 3D printing faces limitations in accuracy and poor surface quality for small dimensions, particularly constraining the ability to manufacture precis...
Conference Paper
Electromyography (EMG) is a crucial technique for measuring muscle activity and is regularly used in motion detection and diagnostics. When applied to small muscles and integrated into devices such as prostheses or force measurement systems, conventional electrodes often fail to meet space and usability requirements. While conductive filaments have...
Conference Paper
Full-text available
Air-coupled ultrasonic transducers are widely used in non-destructive testing, acoustical sonar systems, and biomedical imaging. These applications require transducers that operate effectively across a broad acoustic frequency spectrum, offer adaptable geometric designs, and increasingly incorporate eco-friendly materials. In this work, we present...
Article
Detecting human movement is crucial for the control of lower limb wearable robotics designed to assist daily activities or rehabilitation tasks. Sensorized insoles present a viable option for extracting control inputs, such as gait events and the corresponding phases, essential for regulating the magnitude and timing of assistance. Given their high...
Conference Paper
Full-text available
The development of smart wearables, involving the sensor integration into textiles, has emerged in several applications, such as heart rate monitoring in healthcare contexts, smart insoles for gait analysis, or gesture recognition for virtual reality interfaces. A common challenge in this field is the incorporation of off-the-shelf sensors, which a...
Article
Full-text available
A theoretical model has been developed to express the longitudinal and transverse piezoelectric effects in ferro/piezoelectrets. This model is an extension of the classic model based on layer-dielectric structures that focuses on the longitudinal piezoelectric effect. The improved model reveals that the relation between the longitudinal piezoelectr...
Article
Full-text available
In recent years, the demand for sustainable and degradable materials and electronic devices has increased significantly. Among a range of biodegradable polymers, poly(lactic acid) (PLA) is a good alternative to conventional petrol-based polymers because of its attractive mechanical properties and its easy processability. Recently, PLA has also been...
Conference Paper
Full-text available
Abstract—The development of piezoelectric sensors using ferroelectrets is a very active field that is increasingly gaining importance. Recently, 3D-printing ferroelectret sensors using fused deposition modeling technique has been extensively investigated due to its unparalleled advantages in terms of design flexibility and cost-effectiveness. Never...

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