摘要:
A system for storing and monitoring samples in a temperature-controlled storage environment, including one or more containers each housing one of the samples; a machine readable tag associated with each container, wherein each tag includes a plurality of resonant members encoding an identification code, at least one of the resonant members having temperature-dependant characteristic; an interrogator for reading the identification code and the temperature-dependant characteristic; and a controller and associated database for monitoring the thermal history of each container.
摘要:
A microwave sensor probe (202) includes a probe housing (208), an emitter body (300) coupled to the probe housing, and an emitter (206) coupled to the emitter body. The emitter is configured to generate an electromagnetic field from at least one microwave signal. At least one electromagnetic absorbent member (302) is configured to absorb at least one of a current transmitted through the emitter and an electromagnetic radiation generated by the emitter.
摘要:
A capacitance probe (10) measures and tracks frequency and amplitude changes of a component during a high cycle fatigue portion of a life test. The probe includes an internal oscillator (14), an adjustable receiver circuit (16), a product detector (18), and a pair of gain amplifiers (40, 42). The oscillator generates a single controlled frequency output. The receiver circuit receives the frequency and creates a DC voltage shift that nulls the capacitance bridge. The product detector detects an amplitude modulated product of the oscillator and rejects (92) undesirable frequencies. gain amplifiers detect (100) a DC voltage shift and permit the capacitance effect to be easily nulled.
摘要:
To provide a small, thin and light-weighted composite sensor which can also detect light together with sound, vibration, pressure or acceleration by a single sensor. An electret capacitor type composite sensor is constituted by a casing 11, an electrode 12, a hole portion (which is a sound hole and also a light introduction hole) 22, a spacer 31, a vibration plate 41 having light transmissibility, a vibration plate ring 42, a printed board 6 and a semiconductor element 61. Further, a photoelectric conversion portion having a function of photoelectric effect is provided at a portion of the surface of the semiconductor element 61, light is conducted to the photoelectric conversion portion via the hole portion 22 and the vibration plate 41 having light transmissibility, and an electric signal generated by the photoelectromotive force is taken out independently from an electric signal generated by the change of the electrostatic capacitance of the electret capacitor.
摘要:
The invention relates to a method of adjusting at least one faulty rotor of a rotorcraft, regardless of whether it is the main rotor or an anti-torque rotor. The inventive method makes use of a neural network which displays the relations between: (i) accelerations that are representative of vibrations generated on at least part of a reference rotorcraft, and (ii) adjustment parameters and defects. According to the invention, once the faulty rotor defects have been determined, an adjustment value a for at least one of the adjustment parameters is defined, advantageously minimising the following adjustment relation: formula (I).
摘要:
The invention relates to a method and a device for detecting oscillations of the shafting of an electric machine, according to which the shaft voltage (Us(t)) and/or the shaft current (Is(t)) is/are measured and analyzed regarding components that are characteristic of said oscillations. The inventive method, which utilizes the shaft voltages or shaft currents that are usually considered as almost exclusively detrimental, is sufficiently precise and is highly suitable for the long-term monitoring of such oscillations while being reliable and easy to realize.
摘要:
A vibration measuring apparatus (10) inlcudes an accelerometer (12) which is contained within a surface micromachined integrated chip, and signal processing means including a high pass filter (14), a low pass filter (16) and an integrator (18).
摘要:
A three-axis acceleration sensor having a simple construction is provided for improving shock resistance without lowering sensor sensitivity. An acceleration sensor for detecting acceleration in three orthogonal directions includes an electrode substrate (5) having fixed electrodes corresponding to three axes, respectively, a diaphragm (2) having one surface thereof opposed to the fixed electrodes acting as a movable electrode, and a weight (1) mounted centrally of the other surface of the diaphragm. Acceleration is detected based on variations in capacitance between the fixed electrodes and diaphragm (2). The electrode substrate (5) has an electret layer (4) formed to cover surfaces of the fixed electrodes.
摘要:
The invention concerns a method and a device for detecting defects in at least one rotor of a rotary wing aircraft, in particular of a helicopter, and for adjusting said rotor. The method is characterized in that it consists, in a preliminary step, in using a reference aircraft corresponding to a particular type of aircraft, whereof the rotor (6, 10) is defect-free and is adjusted such that the vibratory level is minimal, in performing a series of measurements on the aircraft (1) and deducing therefrom a neural network illustrating the relationships between accelerations representing vibrations, and setting defects and parameters. Then, in a subsequent step, for a particular aircraft (1) of said similar type, in performing measurements on said particular aircraft (1), based on said measurements and on the neural network, in detecting possible defects and determining the values of setting parameters, which enable the vibratory level of the aircraft (1) to be reduced to a minimum, and applying them to the rotor (6, 10).