1188 results about "Vibration sensing" patented technology

A configurable vibration sensor having a sensor circuit, an analog-to-digital converter and a processor is provided. The sensor circuit employs a vibration sensing element and a variable bandwidth filter controllable by the processor. In addition to the variable bandwidth filter, other configurable elements may also be employed in the sensor circuit, including a variable gain amplifier. These configurable elements allow the configurable vibration sensor to be configured for different vibration measurement applications when measuring vibrations from vibrating structures such as machinery and the like.

Bending wave vibrations propagating in a substrate of a touch input device are sensed. Provision is made for discriminating between sensed vibrations propagating in the substrate indicative of an intended touch and sensed vibrations propagating in the substrate indicative of an unintended touch. In response to the sensed vibrations propagating in the substrate indicative of the intended touch, a wake-up signal is generated. The wake-up signal is communicated to a control system of the touch input device for transitioning the control system from a sleep state to an operational state.

A method and apparatus for sensing and measuring stress waves. The method comprises the steps of: a.) sensing motion, where the motion comprises a stress wave component and a vibration component; b.) separating the stress wave component from the vibration component with a high pass filter to create a signal proportional to the stress wave; c.) amplifying the signal to create an amplified signal; d.) processing the amplified signal with a sample and hold peak detector over a predetermined interval of time to determine peaks of the amplified signal over said predetermined period of time; e.) creating an output signal proportional to the determined peaks of the amplified signal; and, f.) repeating steps d.) and e.). The invention also includes an apparatus for implementing the method of the invention.

To provide an electromechanical signal selection device which can be miniaturized and highly integrated and which can selectively output only a signal of a predetermined frequency without providing any sensitive vibration sensing mechanism, and electric equipment using the electromechanical signal selection device. A micro-vibrator serving as a resonator is provided. The micro-vibrator can be excited by an external force to excite vibration of the micro-vibrator. A material whose physical property is changed in accordance with a structural change is used as the micro-vibrator. Thus, a sensitive electromechanical signal selection device is obtained.

A configurable vibration sensor comprising a sensor circuit, an analog-to-digital converter and a processor, where each sensor circuit comprises a vibration sensing element and a variable bandwidth filter controllable by the processor. In addition to the variable bandwidth filter, other configurable elements may also be employed in the sensor circuit, including a variable gain amplifier. These configurable elements allow the configurable vibration sensor to be configured for different vibration measurement applications when measuring vibrations from vibrating structures such as machinery and the like.

A MP3 player having an exercise meter is provided. The MP3 player includes a DSP processor for processing audio data and playing them; a vibration sensing component for generating a first signal following with a user's vibration and transmitting the first signal to the DSP processor; and a heartbeat sensor for sensing the heartbeat condition of the user to generate a second signal and transmit the second signal to the DSP processor. By using the DSP processor to process the first and the second signals to obtain the status of physical strength of the user, so that when the user carries the MP3 player for exercising, the MP3 player can play the music, and always monitor the exercising status of the user.

Bending wave vibrations propagating in a substrate of a touch input device are sensed. Provision is made for discriminating between sensed vibrations propagating in the substrate indicative of an intended touch and sensed vibrations propagating in the substrate indicative of an unintended touch. In response to the sensed vibrations propagating in the substrate indicative of the intended touch, a wake-up signal is generated. The wake-up signal is communicated to a control system of the touch input device for transitioning the control system from a sleep state to an operational state.

Methods and apparatus for monitoring a hydrocarbon production system. A fiber optic sensor system is deployed into hydrocarbon production system, so as to extend to location of interest within the system, for instance, in conjunction with a downhole component or a surface component. The fiber optic system detects vibration present in the production system component, and provides a signal indicative of the vibration to a signal acquisition and analysis unit. The vibration of the production component is analyzed and a change in system flow condition / property or a change in production system component integrity is determined.

The invention discloses a fully distributed optical fiber strain and vibration sensor comprising a laser (1), a first coupler (2), a pulse modulation module (3), an optical amplifier (4), a circulator (5), a sensing optical fiber (6), a fiber bragg grating (7), a polarization scrambler, a second coupler, a balance photoelectric detector, an analyzer, a photoelectric detector (12) and a signal processing unit. Continuous light output by the laser (1) is split into two paths through the first coupler (2), wherein one path is used as reference light and is accessed to a first input end of the second coupler (9) through the polarization scrambler (8); and the second path is processed by the pulse modulation module (3) and the optical amplifier (4) and then used as detection pulse light to be injected into a first port of the circulator (5). In the invention, Brillouin optical time domain reflectometry (BOTDR) and polarization optical time domain reflectometry (POTDR) are simultaneously utilized for respectively and correspondingly carrying out fully distributed measurement on strain and vibration on a signal optical fiber, the defects of a system with single BOTDR or POTDR are overcome, and the false alarm rate or missed report rate of the system is decreased.

In a plasma processing system, a method for detecting an arc event on a substrate in a plasma chamber having a chuck is disclosed. The method includes positioning a substrate on the chuck. The method also includes providing a vibration-sensing arrangement in the plasma chamber, the vibration-sensing arrangement being configured for measuring arc-induced vibrations on the substrate, the arc-induced vibrations being generated when an arc strikes the substrate during plasma processing of the substrate in the plasma processing chamber.

The invention provides a zooming shooting module which at least comprises a focusing lens set, a zooming lens set, a focusing driving element, a zooming driving element, an optical sensing element and a vibration sensing element, wherein the focusing driving element at least comprises a first moveable component, a first fixed component and a first electric unit; the first electric unit can supply an axial displacement and at least one axial inclined angle compensation; the zooming driving element at least comprises a second moveable component, a second fixed component and a second electric unit; the second electric unit can supply an axial displacement; and the axial inclined angle compensation which is supplied by the first electric unit of the focusing driving element can also be supplied by the second electric unit of the zooming driving element.

The invention discloses a long-distance distributed optical fiber vibration sensing system and a method thereof. The system comprises an induction system for inducting outside vibration events and a detecting and controlling system for detecting and controlling vibration signals; the induction system is connected with the detecting and controlling system. The induction system comprises a light source, a pulse modulator, an optical fiber circulator, a first optical fiber amplifier, and a light switch of a first optical fiber filter. The detecting and controlling system comprises a plurality of optical-electrical converters and a system control unit; the system control unit collects output light of the converters, analyzing the collected signals and judges whether the alarm is needed according to the analysis result. The invention adopts the optical switch technology to adopt time-division processing on backward Rayleigh scattering light which is reflected back, the dynamic range of the system is large, and the sensible distance can be tens of kilometers as high as possible, even hundreds of kilometers; and the invention adopts phase detecting technology and optical time domain reflection technology and can greatly improve detecting sensibility of the system and positioning precision.

The invention relates to the technical field of optical fiber vibration sensing and in particular relates to an interference type optical fiber perimeter vibration intrusion recognition algorithm suitable for security perimeter. The interference type optical fiber perimeter vibration intrusion recognition algorithm is characterized by comprising the following operations: reading data acquired by an optical fiber vibration sensor from a data acquisition end, and normalizing the acquired data; performing empirical mode decomposition; calculating a characteristic value of an empirical mode decomposition result; detecting multiple characteristic values, judging whether intrusion exists, if so, alarming, otherwise repeating the steps 1-5 for performing recognition in the next round. Compared with the prior art, the interference type optical fiber perimeter vibration intrusion recognition algorithm has the advantages that an original signal is subjected to empirical mode decomposition, the judgment accuracy is improved, the possibility that false alarm is caused due to a certain occasional specific characteristic can be eliminated by adopting a multi-characteristic value threshold detection mode, and intrusion alarm can be accurately realized under the condition that interferences of wind, rain, vehicles and the like exist.

A deep learning based distributed optical fiber vibration sensing type intelligent safety monitoring method includes: signal demodulation and disturbance positioning of a distributed optical fiber vibration sensing technique; demodulation pattern acquisition; sample library construction and network training for network model generation; online real-time disturbance type recognition with a networkmodel; network model online training optimization and the like. Safety monitoring is realized by adoption of detection lines or zone boundary communication cables, and the method has advantages of high extensibility, convenience in networking, low cost, lightning interference prevention and the like. In addition, the method takes full distributed advantages of distributed optical fiber vibration sensing to realize classification and recognition of disturbance information by the aid of a deep learning network, high intelligent recognition accuracy and online optimization performances are achieved, long-distance and large-range circuit safety alarm information management cost and onsite confirmation cost can be reduced, and engineering application process and development of the field of distributed optical fiber safety monitoring systems are greatly promoted.

A sensor system comprises a mat (20) for placement over a patient's mattress including a number of sensors (10) located in the mat. The sensors include a sensor housing (12), a sound vibration sensing element in the form of a PVDF membrane (13), and means for amplifying sensed sounds. The PVDF membrane is coated / covered with a typically latex, impedance matching layer (14). The sensor automatically provides for auscultation, in which the patient's own weight, from the patient lying on the bed, compresses their thorax against the membrane, compressing also the patient's clothing, bed sheet and mattress cover material between the two. The recoil in the mattress opposes the body mass, thus compressing the membrane against the thorax. The impedance matching layer on top of the membrane transmits fine breath sounds through to the membrane as the latex does not weaken or attenuate the fine breath sounds but transmits them to the PVDF membrane. However being flexible, it is not uncomfortable to lie on.

The invention discloses a distributed optical fiber vibration sensing system disturbance event identifying and positioning method. The method includes the steps that according to the position and the number of peaks with signals exceeding a certain threshold value, the number of the peaks occurring within the scope ranging from deltal / 2 in front of each point to deltal / 2 behind each point in an optical fiber is obtained, whether disturbance events exist or not is judged, and backgrounds are extracted with an amplitude limiting one-order inertia filtering method when the disturbance events do not exist; space-time terminals of the disturbance events are obtained according to the backgrounds when the disturbance events exist, fitting is carried out within the area range to obtain a background event probability density function, Gaussian mixture distribution parameters including the specific gravity, the expectations and the covariance matrix of Gaussian contents of the event peaks including the backgrounds in the area are solved through iteration of the EM algorithm, the parameters, the parameters of the background event probability density function and the total number of the event peaks in the area are fed into a classifier, the disturbance types are judged, and the expectations of the Gaussian contents represent the space positions of the events.

A method and apparatus for sensing and measuring stress waves. The method comprises the steps of: a.) sensing motion, where the motion comprises a stress wave component and a vibration component; b.) separating the stress wave component from the vibration component with a high pass filter to create a signal proportional to the stress wave; c.) amplifying the signal to create an amplified signal; d.) processing the amplified signal with a sample and hold peak detector over a predetermined interval of time to determine peaks of the amplified signal over said predetermined period of time; e.) creating an output signal proportional to the determined peaks of the amplified signal; and, f.) repeating steps d.) and e.). The invention also includes an apparatus for implementing the method of the invention.

The invention discloses an optical fiber vibration sensing head, which consists of a vibration sensitive chip, a dual fiber collimator and an encapsulation shell, wherein the inside of the encapsulation shell under the dual fiber collimator is provided with a cavity, the vibration sensitive chip is arranged in the cavity and consists of micro light reflector, a silicon supporting frame and a substrate glass sheet; the silicon supporting frame is bonded with the substrate glass sheet; the micro light reflector is arranged in the silicon supporting frame; a damping air cavity is reserved between the micro light reflector and the substrate glass sheet; two sides of the micro light reflector is symmetrically provided with torsion shafts; and one end of each of the torsion shaft is connected with the silicon supporting frame. An MEMS process is used to integrate a MEMS vibration sensitive chip. Based on an asymmetric torsion micro light reflector structure, the MEMS vibration sensitive chip can be manufactured in batch. The torsion shafts are used as elastic elements, and the micro light reflector is used as a sensitive mass block to reflect vibration acceleration. The damping air cavity is used for controlling the damping characteristic of torsion. The invention has the advantages of batch production, low cost and high consistency.

An optical module, a camera, and a mobile terminal device are provided. The optical module includes a lens unit, a lens driving unit, a driving control unit, and a vibration sensing unit. The vibration sensing unit is configured to detect vibration / shaking of the optical module, the camera, or the mobile terminal device and transmit a detected signal to the driving control unit. The driving control unit generates a corresponding vibration / shaking compensation signal according to the detected signal of the vibration sensor, and performs a vibration / shaking compensation movement by driving the lens with the lens driving unit. The optical module is applied in the camera and the mobile terminal device. The present invention has not only an auto-focusing function, but also an added anti-vibration function, so as to overcome influences on image degradation resulted from vibration / shaking of the optical module, the camera, or the mobile terminal device.

A micro-milliactuator, a micro-microactuator, an actuator arm assembly, a hard disk drive and a method for operation of the hard disk are provided. In accordance with one aspect, the actuator arm assembly includes an arm, a slider for reading and writing information to disk media in response to read / write signals, and an actuator selected from the group comprising a micro-milliactuator and a micro-microactuator. The actuator has the slider mounted thereon and supports it above the disk media. The actuator includes one or more piezoelectric actuators for horizontally shifting the slider in response to actuator control signals. The actuator further includes one or more sensors physically coupled thereto for vibration sensing, compensation and suppression, the one or more sensors generating sensor signals in response to sensed vibrations during operation, wherein the actuator control signals are generated at least partially in response to the sensor signals.

A surface analysis apparatus and a method for compensating for mechanical vibrations and drifts in a surface analysis instrument are disclosed. A probe that is sensitive to the distance between the probe and a sample surface provides a probe signal. The probe signal contains information about the surface properties and noise due to changes in the probe-surface distance. A sensor measures a displacement between a probe and the sample surface. The sensor is substantially insensitive to the surface properties measured by the probe. The displacement measurement can be used to compensate for the noise in the probe signal.

The invention provides a terrain semantic perception method based on vision and vibration touch fusion. The terrain semantic perception method comprises the steps: firstly, giving an implementation method of vision three-dimensional semantic mapping based on ORB_SLAM2 and semantic segmentation; secondly, in combination with a terrain semantic classification and recognition method based on CNN-LSTM, giving a realization thought and a fusion strategy of vision / touch fusion; and finally, based on the blue whale XQ unmanned vehicle platform, the Kinect V1.0 visual sensing unit and the vibration sensing unit, carrying out algorithm testing in a real object environment. Therefore, the semantic marking precision of the method obtained by comparing a test result with a real environment can meet the application requirements; and meanwhile, whether the terrain semantic cognition is good or not can be obviously compared according to the fusion result of whether the vibration touch exists or not,so that more reliable sensing capacity can be provided for the patroller through fusion of the vibration touch and the terrain semantic cognition, and the vibration touch can still provide terrain cognition precision within a limited range even under the condition of visual failure.

The invention relates to the field of optical fiber sensing, specifically a phase-light time domain reflection device and method based on heterodyne detection phase demodulation. The device consists of a narrow linewidth laser, an optical fiber coupler with a coupling model of 1*2, a polarization controller, a sound-light modulator, an erbium-doped optical fiber amplifier, a narrow-band optical fiber filter, a first variable optical attenuator, a three-port circulator, a sensing optical fiber, an optical fiber coupler with a coupling model of 2*1, a photoelectric detector, a signal collection and processing module, an arbitrary waveform generator, a power amplifier, and a second variable optical attenuator. The device and method enable the heterodyne detection phase demodulation to be combined together, achieve external vibration sensing through direct phase demodulation, and are higher in sensitivity. In addition, the device and method employ a brand new direct phase modulation method to sense the external vibration, so the positioning method, compared with a conventional method, of each vibrating point is different.

The invention discloses a distributed optical fiber vibration sensor based on the relay amplifying and sensing technology and a method thereof, belonging to the technical field of optical fiber vibration sensing. The system comprises a light source, an electro-optical modulator, a pulse driver, a light amplifier, a circulator, a polarizing beam splitter, a collector and a signal analysis processing system. The sensor is characterized in that the system also comprises a pumping laser light source and an optical remote sensing relay amplifying and sensing optical module. The pumping laser light source is arranged in the distributed optical fiber vibration sensing demodulation device and the optical remote sensing relay amplifying and sensing optical module is embedded between multistage sensing fibers. The passive optical modules of the pumping laser light source and optical remote sensing relay amplifying and sensing optical module perform long-distance connection through transmission fiber to form the light amplifier, the gain of the optical remote sensing relay amplifying and sensing optical module is utilized to overcome fibre loss, increase the intensity of the spontaneous Rayleigh scattering light of the optical fibre, enhance the signal-to-noise ratio of the distributed optical fiber vibration sensing system, enlarge the transmission distance of the system and increase the measurement accuracy of vibration events in the target area. The system is mainly used in the fields requiring long-distance measurement vibration signals such as perimeter safety precaution, border precaution, seismic detection and tsunami early warning.

A vibration-sensing field unit includes a base with at least one accelerometer, and a body mounted to the base. The base is composed essentially of a first material, while the body is composed essentially of a second material that is more flexible than the first material to reduce a vibration at the accelerometer caused by a mass supported by the body. In another embodiment, a vibration-sensing field unit includes at least one accelerometer and at least one ultrasonic transducer.

The invention discloses a railway rockfall early warning system and method. The railway rockfall early warning system comprise a fiber bragg grating vibration sensing part, a fiber bragg grating demodulating instrument and an analyzing and alarming device, wherein the fiber bragg grating vibration sensing part is provided with a fiber bragg grating suitable for generating strains along with the vibration of a track; the fiber bragg grating demodulating instrument is used for guiding light emitted by a light source to the fiber bragg grating, receiving light reflected back from the fiber bragg grating and outputting an electric signal reflecting wavelength variation, caused by the strains, of the reflected light; and the analyzing and alarming device is used for acquiring the wavelength variation information of the light reflected back from the fiber bragg grating so as to determine whether to give out an alarm on the fault of the track. The invention also relates to a railway rockfall early warning method, comprising the following steps of: providing the fiber bragg grating generating strains along with the vibration of the track; acquiring the electric signal reflecting the wavelength variation of the light reflected back from the fiber bragg grating through the fiber bragg grating demodulating instrument; acquiring the wavelength variation information of the light reflected back from the fiber bragg grating on the basis of the electric signal; and determining whether to give out an alarm on the basis of the wavelength variation information.

A distributed optical fiber sensing signal processing method for safety monitoring of underground pipe network, which belongs to infrastructure safety monitoring field, which is aimed to improve the intelligent ability of detection and identification of the existing distributed optical fiber sound / vibration sensing system under complex application conditions. The present invention utilizes the distributed optical fiber sound / vibration sensing system to pick up the sound or vibration signal of the whole line along the detection cable; and the customized short time feature and long time feature are respectively extracted from the relative quantity of the sound or the vibration signal at each spatial point in the whole monitoring range. The Bayesian identification and classification network at each spatial point is constructed and trained based on the prior knowledge of the collected signal features and their different background noises.

The invention provides a method and a system for on-line locating a power cable fault. The method is characterized by converting a vibration signal of a power cable into an optical signal by utilizing an optical cable which is parallelly and tightly laid with the power cable in an adhesion way, carrying out monitoring treatment for the optical signal by utilizing an optical fiber vibration sensing system, and finally obtaining the position of a fault point of the power cable by analyzing. According to the method for on-line locating the power cable fault, provided by the invention, an on-line mode is adopted, the technology of distributed optical fibers in a vibration measuring aspect is applied to high-voltage power cable fault point detecting and finding, the purpose of efficiently locating the fault point of the power cable under an on-line state is realized, and the method and the system have actual social benefit.

The invention discloses an optical fiber grating acceleration sensor and a test method thereof, relating to the technical field of optical fiber grating vibration sensing. The optical fiber grating acceleration sensor comprises a U-shaped shell, a steel beam, a first optical fiber grating, a second optical fiber grating, a mass block, a spring, damping fluid, a clamping groove, a concave lever, a folding arch beam and a seal cover, wherein the opening end of the U-shaped shell is provided with the seal cover; the inner wall of the U-shaped shell is connected with one end of the steel beam, and the other end of the steel beam is fixedly connected with the folding arch beam; the folding arch beam is fixedly connected with the concave lever; the concave lever fixed to the clamping groove is connected with the mass block; the mass block is connected with the inner wall of the shell by the spring; the first optical fiber grating and the second optical fiber grating are respectively arranged on the folding arch beam; and the damping fluid is filled in the U-shaped shell. The invention realizes the repeated design and use according to the engineering practical demand and changes the system rigidity by conveniently disassembling and replacing folding arch beams with different sizes, thereby realizing the adjustability of sensitivity and natural vibration frequency and achieving the aim of temperature self compensation.