A device is provided for capturing operating data of a tool, wherein the tool is powered by an electric motor or a combustion engine, and wherein the device is embodied separately from the tool and is able to be coupled to the tool. The device includes: an operating data sensor, which is configured to wirelessly capture operating data of the tool, an operating data memory, which is configured to store operating data captured by the operating data sensor; and a communication interface, which is configured to wirelessly transmit operating data stored in the operating data memory to a terminal device.

The present disclosure relates to a method for estimating one or more compensation parameters from impedance measurements of an acoustic load. The method comprises a series of steps including providing a probe assembly measurement setup and the disclosure also relates to a system to perform impedance measurements. The compensation parameters are estimated through a minimization process, preferably minimizing an error estimate of a first real and second imaginary part of the reflectance. The resulting compensation parameters are used to restore causality of the reflectance and accordingly provide more accurate impedance measurements.

An acoustic module is coupled to an acoustic passage. The acoustic module includes an acoustic transducer coupled to a diaphragm. A controller or other circuitry measures an impedance of the acoustic transducer. Based on the impedance, the controller determines whether the impedance indicates that the acoustic passage is blocked. The controller may determine that the acoustic passage is blocked by liquid that is present in the acoustic passage. When the controller determines based on the impedance that liquid is present in the acoustic passage, the controller may drive out, purge, and/or otherwise remove the liquid, such as by using the acoustic transducer to vibrate the diaphragm.

An acoustic module is coupled to an acoustic passage. The acoustic module includes an acoustic transducer coupled to a diaphragm. A controller or other circuitry measures an impedance of the acoustic transducer. Based on the impedance, the controller determines whether the impedance indicates that the acoustic passage is blocked. The controller may determine that the acoustic passage is blocked by liquid that is present in the acoustic passage. When the controller determines based on the impedance that liquid is present in the acoustic passage, the controller may drive out, purge, and/or otherwise remove the liquid, such as by using the acoustic transducer to vibrate the diaphragm.

Provided is a sound-transmitting waterproof film having waterproof performance and stable sound-transmitting performance in a wide tonal range. The sound-transmitting waterproof film includes a porous film of a synthetic resin, and has a water pressure resistance of 10 to 400 kPa in accordance with a JIS L 1092 method B (a high water pressure method) and has an acoustic loss of less than 10 dB at a frequency of 1 kHz, an acoustic loss of less than 5 dB at a frequency of 2 kHz, and an acoustic loss of less than 5 dB at a frequency of 5 kHz in sound-transmitting performance tests.

Provided is a sound-transmitting waterproof film having waterproof performance and stable sound-transmitting performance in a wide tonal range. The sound-transmitting waterproof film includes a porous film of a synthetic resin, and has a water pressure resistance of 10 to 400 kPa in accordance with a JIS L 1092 method B (a high water pressure method) and has an acoustic loss of less than 10 dB at a frequency of 1 kHz, an acoustic loss of less than 5 dB at a frequency of 2 kHz, and an acoustic loss of less than 5 dB at a frequency of 5 kHz in sound-transmitting performance tests.

Proposed is a diagnostic sensing structure for a drone's drive system and a block-type diagnostic device for a drone's drive system including the same, which, by having a diagnostic sensor unit measuring physical quantities generated from the drone's drive system, may accurately diagnose any abnormalities in the drive system such as a motor and blade before flight, may detect abnormal operation of the drone's drive system during takeoff and landing by configuring, together with a general block-type dummy pad, a block-type sensor pad that detects abnormal operation of the drive system as a takeoff and landing site for drones, and may significantly reduce the costs of building a station and diagnostic system for drones.

According to one aspect, embodiments herein provide an electrical connection sensor comprising at least one transducer configured to be coupled to a power distribution block, to generate ultrasonic pulses in the power distribution block, and to receive ultrasonic signals based on the ultrasonic pulses, and a controller coupled to the at least one transducer and configured to determine a status of at least one electrical connection in the power distribution block based on at least one characteristic of the ultrasonic signals received by the at least one transducer.

Systems and techniques are provided for deicing/defrosting an ultrasonic sensor using frequency tuning. An example method can include determining that a radiation surface of a housing of an acoustic sensor includes a layer of frozen precipitation, wherein the housing contains a transducer configured to emit sound waves through the radiation surface and receive sound waves that are reflected from a target and pass through the radiation surface to the transducer; determining resonance frequency for sound waves that yields a shear stress on an interface between the radiation surface and the layer of frozen precipitation on the radiation surface, wherein the shear stress exceeds an adhesive shear strength of the layer of frozen precipitation; generating the sound waves having the resonance frequency; and removing the layer of frozen precipitation on the radiation surface based on the sound waves having the resonance frequency.

Proposed is a diagnostic sensing structure for a drone's drive system and a block-type diagnostic device for a drone's drive system including the same, which, by having a diagnostic sensor unit measuring physical quantities generated from the drone's drive system, may accurately diagnose any abnormalities in the drive system such as a motor and blade before flight, may detect abnormal operation of the drone's drive system during takeoff and landing by configuring, together with a general block-type dummy pad, a block-type sensor pad that detects abnormal operation of the drive system as a takeoff and landing site for drones, and may significantly reduce the costs of building a station and diagnostic system for drones.