A system, method, and computer program product for utilizing an ultrasonic sensor compensating for the physical conditions of an internal battery compartment (e.g., temperature and/or humidity), to detect a hazardous battery condition, is provided. An example system includes a battery case defining an internal battery compartment and one or more battery cells contained in the internal battery compartment. The example system further includes an acoustic transmitter disposed within the internal battery compartment and configured to transmit an acoustic signal. In addition, the example system includes an acoustic receiver also disposed within the internal battery compartment and positioned to receive the transmitted acoustic signal. The example system monitors the time of flight of the acoustic signal and detects the hazardous battery condition of the one or more battery cells based on a change in the time of flight of the acoustic signal.

Systems and methods for a directional blast gauge including a plurality of blast sensors are disclosed, including a first blast sensor having a first power consumption metric when in operation and two or more second blast sensors having a second power consumption metric lower than the first power consumption metric, wherein positions of the first blast sensor and the two or more second blast sensors define a first plane, and a control circuit configured to measure a blast overpressure waveform of an event using the first blast sensor and to determine time differential data of the event using the two or more second blast sensors.

Systems and methods for a directional blast gauge including a plurality of blast sensors are disclosed, including a first blast sensor having a first power consumption metric when in operation and two or more second blast sensors having a second power consumption metric lower than the first power consumption metric, wherein positions of the first blast sensor and the two or more second blast sensors define a first plane, and a control circuit configured to measure a blast overpressure waveform of an event using the first blast sensor and to determine time differential data of the event using the two or more second blast sensors.

Systems and methods of object classification at point of sale are provided. In one exemplary embodiment, a method is performed by a POS system having processing circuitry operationally coupled to a transducer operable to radiate a pressure wave and a sensor operable to sense a pressure wave. Further, the transducer and the sensor are positioned on or about the POS system so that a field of radiation of the transducer and a field of detection of the sensor are directed towards a certain region of the POS system. The method includes receiving, from the sensor, a reflected signal that represents a pressure wave radiated by the transducer that is reflected from a surface of an object when in or about the certain region of the POS system so that the object can be classified as at least one of a set of object types based on the reflected signal.

A sound velocity sensor for underwater use has an acoustic transmitter and receiver, a path length portion defining an acoustic path and positioned such that a generated acoustic signal propagates along the acoustic path from the acoustic transmitter to the receiver, a temperature sensor in direct contact with the path length portion, and a controller communicatively coupled to these components. The controller is configured to generate the acoustic signal using the acoustic transmitter, determine a transit time of the acoustic signal from the acoustic transmitter to the acoustic receiver, determine a temperature of the path length portion using the temperature sensor, and determine the velocity of the acoustic signal from the transit time and a length of the acoustic path. Determining the velocity includes compensating for a temperature-related change in the length of the acoustic path using the temperature of the path length portion.

A sound velocity sensor for underwater use has an acoustic transmitter and receiver, a path length portion defining an acoustic path and positioned such that a generated acoustic signal propagates along the acoustic path from the acoustic transmitter to the receiver, a temperature sensor in direct contact with the path length portion, and a controller communicatively coupled to these components. The controller is configured to generate the acoustic signal using the acoustic transmitter, determine a transit time of the acoustic signal from the acoustic transmitter to the acoustic receiver, determine a temperature of the path length portion using the temperature sensor, and determine the velocity of the acoustic signal from the transit time and a length of the acoustic path. Determining the velocity includes compensating for a temperature-related change in the length of the acoustic path using the temperature of the path length portion.

A seismic sensor detects an earthquake with at least a predetermined magnitude and outputs a predetermined signal. The sensor includes an acceleration measurement unit that measures an acceleration applied to the seismic sensor, a velocity calculation unit that calculates a velocity response value using the acceleration measured by the acceleration measurement unit, an earthquake determination unit that determines whether the velocity response value is greater than or equal to a predetermined threshold, and an output unit that outputs the predetermined signal when the velocity response value is determined to be greater than or equal to the predetermined threshold.

The present invention relates to a method for obtaining horizontal longitudinal correlation of a deep-sea great-depth sound field. Two testing positions with the same depth and different distances are selected near a deep-sea bottom; time delay differences between a direct wave of a deep sound source in a certain depth reaching two receiving positions and a surface-reflected wave are calculated according to a ray model; one testing position is fixed, and a horizontal spacing between the two positions is continuously changed to recalculate the time delay differences in different positions; and the time delay differences are substituted into a ray theory-based calculation formula of horizontal longitudinal correlation of the deep-sea great-depth sound field to obtain a change rule of the horizontal longitudinal correlation of a target region. The present invention greatly reduces amount of calculation, and is easy in engineering practice.

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.

A two-scale array for detecting wind noise signals and acoustic signals includes a plurality of subarrays each including a plurality of microphones. The subarrays are spaced apart from one another such that the subarrays are configured to detect acoustic signals, and the plurality of microphones in each subarray are located close enough to one another such that wind noise signals are substantially correlated between the microphones in each subarray.