Abstract:
Solid contents verification systems and methods are provided. The system includes a contents sensor unit, a container-carrying unit and a control unit. The contents sensor unit has at least one contents sensor configured to send and receive sonic pulses to determine a state of contents in a container. The contents sensor unit is configured to send a signal communicating a state of the contents in a container. The container-carrying unit is configured to hold a container in substantial alignment with the contents sensors to expose the contents to the sonic pulses. The control unit is operatively connected to the contents sensor unit. The control unit is configured to receive the signal communicating the state of the contents and to compare the state of the contents with a desired state of the contents.
Abstract:
Frequency-steerable acoustic transducers (FSATs) that allow directional generation or sensing of waves propagating in two-dimensional domains. Directionality is the result of the spatial filtering effect produced by the characteristic shape of the sensing surface. A wavenumber spiral FSAT (WS-FSAT) maps the direction of wave sensing in the [0°, 180°] range to a specific frequency component in the spectrum of the received signal. The use of a wavenumber spiral FSAT operating in sensing mode can be used for the localization of broadband acoustic events. One configuration includes a broadband source generating guided elastic waves in an isotropic plate. The WS-FSAT records the plate response and defines the source location through a time-frequency analysis of the received signal. The frequency selective response of the WS-FSAT directly maps the dominant component of the received signal to the direction of arrival of the incoming wave, thus greatly facilitating the source localization procedure.
Abstract:
A defect detection system and method enable a fastened crystalline silicon product to generate micro-vibration by a micro-vibration excitation device, so as to enable the crystalline silicon product to generate an excitation signal, then to acquire the excitation signal by a acquisition device, so as to analyze the excitation signal acquired by the acquisition device in the time and frequency domain by an analysis detection device with a specific analysis, and to obtain an analysis result, at last, determine a defect state of the crystalline silicon product according to the analysis result.
Abstract:
Containerized systems are provided. In one embodiment, a containerized system includes a moveable three-dimensional container, a first generator, a second generator, and a scanner. The first generator is located within the container, and the second generator is located outside of the container. The scanner is mechanically supported by the container and transmits waves received from the first and the second generators. The containerized system optionally includes one or more rails connected to the outside of the container, and the scanner moves along the one or more rails. The containerized system may also include a multi-axes arm that positions the scanner and that is mechanically supported by the container. Furthermore, the containerized system may include an interferometer, an electronics rack, and/or an air conditioning unit.
Abstract:
A standing wave amplification device for vibration signal collection includes a sensing rod (11) acting as standing wave transmission medium. A standing wave formation device includes two fixing support devices (12) distributed along the axial direction and connecting the sensing rod (11) to an operating arm (14). The two fixing support devices (12) respectively collect vibration waves and transmit them to the sensing rod (11) from two different locations of the operating arm (14). The vibration waves are superimposed to form a standing wave on the sensing rod (11). A vibration sensor (13) is connected to the sensing rod (11) and the vibration sensor (13) is between the two fixing support devices (12). A wave detected by the vibration sensor (13) is the standing wave. Compared with transverse wave or longitudinal wave transmitted in the transmission medium of prior art, the standing wave has advantages of larger amplitude and more obvious vibration effect. A ladle slag vibration signal detection method based on the device also has said advantages. The sensing rod (11) can make physical resonance, by which the standing wave signal is amplified and real warning rate of ladle slag is improved effectively.
Abstract:
A system may include a data analysis device that is configured to receive from an ultrasonic waveform detector ultrasonic waveform data representative of an ultrasonic waveform that propagated through a sample and resonated within a defect within the sample. The data analysis device may be further configured to select a portion of the ultrasonic waveform data, apply a Fast Fourier Transform to the portion of the ultrasonic waveform data to transform the portion from a time domain to a frequency domain, identify a characteristic frequency of the portion in the frequency domain, and determine a characteristic of the defect based on the characteristic frequency of the portion. In some examples, the characteristic of the defect may be at least one of an approximate size or an approximate shape of the defect.
Abstract:
The present invention provides a non-intrusive method and device for determining the integrity of a support structure, such as a wooden utility pole. The determination of the structure's integrity is based on the relationship between the structures natural frequency and one or more mechanical and geometrical characteristics. The method includes the steps of generating an acoustic signal, converting the signal into digital signal that can be analyzed, and calculating the structure's strength and mechanical characteristics of the pole over time.
Abstract:
A solution for evaluating the condition of a rail component based on resonant response profiles across a set of bands of vibrations. The vibrations can be induced into the target component during normal operation of the target component. The resonant response profile of the rail component can vary depending on wear or damage, and thus can be used to determine whether the rail component can safely remain in use. An embodiment comprises an isolated segment of rail of a length selected to allow a single railroad wheel on it at a time, with a set of devices which can acquire the resonance signals from the wheel.
Abstract:
The present disclosure relates to nanoresonator oscillators or NEMS (nanoelectromechanical system) oscillators. A circuit for measuring the oscillation frequency of a resonator is provided, comprising a first phase-locked feedback loop locking the frequency of a controlled oscillator at the resonant frequency of the resonator, this first loop comprising a first phase comparator. Furthermore, a second feedback loop is provided which searches for and stores the loop phase shift introduced by the resonator and its amplification circuit when they are locked at resonance by the first loop. The first and the second loops operate during a calibration phase. A third self-oscillation loop is set up during an operation phase. It directly links the output of the controllable phase shifter to the input of the resonator. The phase shifter receives the phase-shift control stored by the second loop.
Abstract:
A piezoelectric resonator includes a plate-shaped crystal element, excitation electrodes, and an unwanted response suppression portion. The excitation electrodes are disposed on both surfaces of the crystal element. The unwanted response suppression portion is formed by inverting a crystallographic axis of the crystal element to suppress an unwanted response that oscillates at a different frequency from a frequency of a main vibration of the crystal element.