摘要:
A method and apparatus for determining at least one characteristic of a fluid flowing within a pipe is provided. The fluid flow may include one or more liquid component bodies and one or more gas component bodies, which bodies occupy a substantial cross-sectional area of the pipe when passing a location in the pipe. The method includes, and the apparatus includes elements operable to perform, the steps of: 1) transmitting a signal into the fluid flow at the location within the pipe, and receiving the signal after it has traversed at least a portion of the fluid flow; 2) determining a time of flight of the signal traversing the fluid flow; 3) determining the presence of a liquid component body at the location in the pipe, using the determined time of flight; and 4) determining at least one characteristic of the fluid using fluid data generated if the liquid component body is present at the location.
摘要:
The present invention provides a sensing device for obtaining information of a test sample using an electromagnetic wave including a frequency region within a frequency region of 30 GHz to 30 THz, the sensing device comprising an electromagnetic wave transmitting portion including a plurality of transmission portions (4a, 4b) for propagating electromagnetic waves and detection portions (3a, 3c) for receiving and detecting the electromagnetic waves from the plurality of transmission portions (4a, 4b), in which at least one of the plurality of transmission portions (4a, 4b) is constructed such that the test sample (5, 6) can be placed in a portion affected by an electromagnetic wave propagating therethrough.
摘要:
A system for determining an acoustic signature of a device is disclosed that includes a computer processor operable to determine strength and location of shock wave sound signals based on propagation of sound waves generated by the device. The strength and location of the shock wave signals are modified due to dissipation and dispersion effects in a non-uniform atmosphere. The shock wave signals are separated into even and odd numbered signals, and oscillations in the signals are smoothed by averaging even and odd numbered shock signals.
摘要:
An ultrasonic sensor for detecting a position and/or a shape of an object located around an automotive vehicle is mounted on a structure of the vehicle such as a bumper. The ultrasonic sensor includes a receiving member for receiving ultrasonic waves reflected on the object to be detected and receiving element having plural vibrating portions. The receiving member is sectioned by intercepting slits into plural receiving regions each corresponding to each vibrating portion. The intercepting slit eliminates or suppresses crosstalk between neighboring receiving regions, and thereby reducing detection noises due to the crosstalk and improving detection sensitivity of the ultrasonic sensor. The shape of the intercepting slit is made to satisfy the formula: 0.35≦L/T≦0.60, where L is a depth of the slit and T is a thickness of the receiving member. In this manner, the crosstalk resulting in detection noises is sufficiently suppressed.
摘要翻译:用于检测位于机动车辆周围的物体的位置和/或形状的超声波传感器安装在诸如保险杠的车辆的结构上。 超声波传感器包括用于接收在待检测物体上反射的超声波的接收部件和具有多个振动部的接收元件。 接收部件通过将狭缝截取成各自对应于每个振动部分的多个接收区域来进行分割。 拦截狭缝消除或抑制相邻接收区域之间的串扰,从而减少由于串扰引起的检测噪声并提高超声波传感器的检测灵敏度。 截取狭缝的形状为:0.35 <= L / T <= 0.60,其中L是狭缝的深度,T是接收部件的厚度。 以这种方式,可以充分抑制导致检测噪声的串扰。
摘要:
A material characteristic measurement approach measures an internal state of a material by measuring the nonlinear shift in velocity induced by different acoustic energies. The technology for implementing this measurement approach is relatively simple, robust, permits portable measurements, does not require that an unloaded initial condition of the material be measured or otherwise known in order to determine a characteristic of the material, can be applied using one or more transducers, and does not require physical contact with the material. Some example material characteristics include a residual stress existing without any external mechanical force applied, applied stress, a fatigue state, age, an interference-fit fastener stress, bio-activity, a nanostructure mixture of the material, a heat treatment of the material, a cross-linking of polymers in the material, a bio-growth organization of the material, a clotting factor of blood or blood-like material, a cure of an adhesive or sealant material, or the microstructure of the material.
摘要:
To perform a non-destructive condition assessment of a pipe carrying a fluid, an actual value representative of the propagation velocity of an acoustic disturbance propagating between two longitudinally separated points on the pipe is determined. A corresponding predicted value for the propagation velocity is computed as a function of at least one wall thickness parameter of the pipe by using a theoretical model for the propagation of acoustic waves in the pipe that assumes said pipe has a finite wall thickness with a predetermined circumferential thickness profile. The wall thickness parameter is then computed by matching the actual value with the predicted value, for example, by substituting the actual value in a formula predicting the theoretical value.
摘要:
An ultrasonic imaging arrangement performs tentative scanning of ultrasound to the inside of a living body with delay time corresponding to average sonic velocity, calculates delay time error in a delay time error detecting circuit by using received signals from each channel to which delay control has been performed in a digital delay circuit, compares in a delay time comparing unit the calculated data with a plurality of delay time error data corresponding to various sonic velocities using sound velocity as the parameter stored before hand in a sound velocity-derived delay time error storing unit, selects among those sonic velocities the one matching the delay time error data with a sonic velocity selecting unit, and calculates the sonic velocity within the living body. The calculated sonic velocity is fed back to CPU, and the delay data on the delay applied in the ultrasonic scanning is provided to a delay circuit.
摘要:
An electronic intelligent indenter system that determines the hardness and the case depth of a hardened portion of a test part in a non-destructive manner. The system employs an electronic indenter tool having a tip. To determine the depth of the case hardened portion of the part, the indenter tip is placed in contact with the surface of the part, and a laser emits a laser beam pulse that impinges the surface of the part proximate the tip. The laser beam generates ultrasonic waves that propagate into the part. The ultrasonic waves reflect off of a transition between the case hardened portion and an unhardened portion of the part. A detector in the indenter system detects the reflected ultrasonic waves. The ultrasonic waves cause the detector to generate a signal identifying the time between when the laser pulse is emitted and when the reflected wave is received. The signal is analyzed by a controller that compares the signal to a standard of calibration for a reflected wave from a hardened portion of a calibration part having a greater depth than the test part.
摘要:
An ultrasonic-wave propagation-time measuring method and gas concentration sensor are disclosed in which a reception wave which has been transmitted and received by an ultrasonic element 5 is subjected to full-wave rectification in order to obtain a full-wave-rectified wave, which is then integrated by an integration circuit 37 to obtain an integral value. A peak value of the integral value is held by a peak-hold circuit 39. As to detection of gas concentration, a threshold-level calculation section 21e sets a reference value on the basis of the peak value, and a point in time when the amplitude of a reception wave having undergone full-wave rectification is judged by a comparator 43 to have reached the reference value is regarded as an arrival time. Subsequently, a gas concentration is determined on the basis of a period between the emission time and the arrival time.
摘要:
A method and apparatus for detecting a position of a mobile robot are disclosed to accurately and precisely detect a position of a mobile robot on the basis of a time difference between an infrared signal and a ultrasonic signal. The infrared signal and the ultrasonic signals are received, a time difference between the received infrared signal and the ultrasonic signals, and then, a position of a mobile robot is detected on the basis of the calculated time difference value and a distance value previously stored between ultrasonic wave generators generating the ultrasonic signals.