Abstract:
The proposed force measuring transducer with a frequency output signal comprises an elastic body arranged in a casing in spaced relationship with said casing. The elastic body, which is subjected to the action of a force, has a base and a working member. The base is secured in the casing with the aid of at least three supports. One end of each support is tapered and bears up against the surface of the base, whereas the other end of each support is joined to the casing. The working member is connected to an oscillating element whose oscillation frequency is dependent upon the action of the force. The oscillating member is the resonator of an electromechanical self-excited oscillator.
Abstract:
A balance for measuring masses and forces comprising a phaselocked frequency multiplier which multiplies the string frequency F1 that is raised by the process of measurement with a predetermined fixed factor in such manner that the multiplied frequency retains a constant phase relationship with the original frequency and wherein the number of full cycles of the multiplied frequency F1 is counted for a period of time corresponding to a given number of full cycles of the frequency F2, which frequency is reduced by the measuring process.
Abstract:
A force control support device includes: a sound wave transmitting unit that causes a sound output device mounted on a user to transmit a first sound wave having a predetermined waveform; a sound wave receiving unit that causes a sound input device mounted on the user to receive a second sound wave based on the first sound wave; an estimation unit that estimates an amount of force being applied by the user based on the first sound wave and the second sound wave; and an electrical stimulation presentation unit that presents an electrical stimulation according to the amount of force estimated by the estimation unit from an electrode mounted on the user.
Abstract:
An array of resonant sensors self-corrects measured values for the effects of environmental conditions, such as operating temperature, pressure or humidity. The resonant sensors have varied frequency responses to N environmental parameters and M chemical parameters. Each of the sensors has a different, non-zero frequency response to at least two of the parameters. The device also comprises at least one detector for detecting frequency responses of the resonant sensors. Individual parameter values are determined for each of the N environmental parameters and M chemical parameters according to the detected frequency responses and a system of equations using calibration terms that relate the frequency responses to the individual parameter values.
Abstract:
A pressure sensor includes a sensor body which has a first surface and a cavity with an opening in the first surface, a cantilever which has a base end portion supported on the first surface and a distal end portion provided to form a gap from a peripheral edge of the opening inside the opening, is flexurally deformed according to a pressure difference between an inside and an outside of the cavity, and is formed of a semiconductor material, and a displacement measurement unit which measures a displacement of the cantilever vibrating according to the pressure difference at a frequency larger than a lower limit frequency fLOW (Hz) defined by Expression (1), where a width (μm) of the gap is represented by G, a volume (ml) of the cavity is represented by V, and a proportional constant is represented by k. fLOW=k·(G2/V) (1)
Abstract translation:压力传感器包括传感器主体,其具有第一表面和在第一表面中具有开口的空腔,悬臂,其具有支撑在第一表面上的基端部分,以及远端部分,其设置成与周边边缘形成间隙 在开口内的开口内部,根据空腔的内部和外部之间的压力差而弯曲变形,并且由半导体材料形成;位移测量单元,其根据压力测量悬臂振动的位移 由式(1)定义的频率大于下限频率f LOW(Hz)的频率的差,其中间隙的宽度(μm)由G表示,空腔的体积(ml)由V表示, 比例常数由k表示。 f LOW = k
Abstract:
A strain sensor for determining a strain experienced by a body under test in response to forces exerted on the body-under-test. The strain sensor comprises an interface member mounted on a surface of the body-under-test and a SAW sensor mounted on a surface of the interface member. The strain in the body-under-test is translated to strain in the SAW sensor and determined by the SAW sensor. The strain in the SAW sensor is responsive to the strain in the body-under-test.
Abstract:
A tool may be inserted into the pressure tube inside a calandria tube of a fuel channel of a nuclear reactor. Once in position, the tool may act to generate information useful for determining a location for an annulus spacer. Once the annulus spacer has been located, the tool may act to generate information useful for determining a compressive load on the annulus spacer due to the annulus spacer being pinched between the two tubes. In both the locating and the load determining, the tool may act to isolate a section of the pressure tube, excite the isolated section of the pressure tube with vibrations and measure resultant tube vibrations. Tube vibration characteristics, determined from the vibrations, may then be analyzed to determine an axial location along the pressure tube for the annulus spacer and/or determine a load on the annulus spacer.
Abstract:
A method of analyzing an engine for misfire activity includes receiving an electrical signal associated with a plurality of cycles of the engine, identifying energy spikes in the electrical signal associated with cylinder firings in the engine, generating engine speed estimates based on spacing between the energy spikes, and analyzing anomalies in the engine speed estimates to identify misfire activity in the engine. Also described is a method of analyzing an engine for misfire activity including receiving an electrical signal associated with the engine, detecting AC ripple in the electrical signal, generating engine speed estimates in response to the detected AC ripple, and analyzing anomalies in the engine speed estimates to identify misfire activity in the engine.
Abstract:
A sensor includes a flexible wafer substrate and an oscillator provided on a principal surface of the wafer substrate, and the oscillator deforms when an external force is applied to the wafer substrate.