Want to detect vibration/sound at one end of a 500-1000 m long metal from other end. Which kind/model of sensor is appropriate?

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Can impedance of antenna be less than 50 ohms?

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Gas sensor response and recovery time independant of flow rate and chamber volume?

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Satellite orbit estimation using Recurrent Neural Network - what should I use?

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Can the problems of overfitting be solved without cross validation?

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Open Source IoT Simulators supported by Machine Learning?

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How do I collect online measures in a same-different task?

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Nikolay Pavlov

Perhaps you can have a look at https://cordis.europa.eu/project/rcn/211306/brief/en

P K Dubey

The piezoelectric sensors in kHz frequency and preferably wide-band are the solution. The frequency generation will also depend the speed of the train. So it is my suggestion to use more than one sensors rather than single. Proper bonding of the transducer with the rail with smooth surface would be the requirement for better sensitivity

Henry Savage

The PVDF film sensors are broadband and will work from a few Hz to to their resonant frequency in the MHz range. They do need to be bonded to the metal though (epoxy). They are a favorite for use as a guitar pickup.