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    • 74. 发明授权
    • Method and device for measuring dielectric constant
    • 测量介电常数的方法和装置
    • US06496018B1
    • 2002-12-17
    • US09787410
    • 2001-06-07
    • Shinichi NagataSeiichi MiyamotoFumiaki Okada
    • Shinichi NagataSeiichi MiyamotoFumiaki Okada
    • G01R2704
    • G01N22/00G01R27/2617
    • The sample measuring face of a dielectric resonator (20) is placed near a standard sample having a known dielectric constant at a fixed interval D. While appropriately varying the dielectric constant and thickness of the standard sample under the above condition, the variation of the resonance frequency of the dielectric resonator (20) is measured for each varied dielectric constant and thickness to draw a calibration curve of the varied resonance frequency depending on the dielectric constant and thickness. Under the same condition where calibration curve is drawn, the variation of the resonance frequency of the dielectric resonator (20) for a sample having a known thickness is measured. The dielectric constant of the sample is found from the measurement value and the calibration curve. The dielectric constant of not only a sheetlike sample but also a three-dimensional molded article or a liquid sample can be measured easily.
    • 将介质谐振器(20)的样品测量面放置在具有固定间隔D的已知介电常数的标准样品附近。在上述条件下适当地改变标准样品的介电常数和厚度,共振的变化 测量各介电常数和厚度的介质谐振器(20)的频率,以根据介电常数和厚度绘制变化的谐振频率的校准曲线。 在与标准曲线相同的条件下,测量具有已知厚度的样品的介质谐振器(20)的谐振频率的变化。 从测量值和校准曲线可以看到样品的介电常数。 可以容易地测量不仅片状样品,而且可以测量三维模制品或液体样品的介电常数。
    • 80. 发明申请
    • Method for measuring quick changes in low surface conductivity of dielectrics under electromagnetic interference of line voltage and equipment to perform this type of measurement
    • US20180003758A1
    • 2018-01-04
    • US15635427
    • 2017-06-28
    • Palacky University Olomouc
    • Petr Frycák
    • G01R31/00G01R27/02
    • G01R31/001G01R27/02G01R27/025G01R27/2617
    • The method for measuring of quick changes of low surface conductivity of dielectrics under electromagnetic interference of line voltage is based on a comparison measurement on a voltage divider and synchronisation of measuring pulses with periodic sinusoidal course of interference when voltage with pre-set parameters of square pulse is brought to the tested dielectric surface and potential is sampled in the voltage divider consisting of the measured dielectric surface and a resistor with preselected resistivity in certain time intervals both before application of the measuring pulse and immediately before its end, and then based on a difference between the values measured using a differential amplifier, the value corresponding to that measured without effect of electromagnetic interference 60 Hz is derived and the result is the possibility to measure quick changes of low surface conductivity of dielectric surface.The equipment for measurement of quick changes of low surface conductivity of dielectrics under electromagnetic interference of line voltage contains the sensing element (1) monitoring electromagnetic interference and the block (2) monitoring electromagnetic interference that is connected to the sensing element, and the comparative block (3) for control of generation of time sequences is connected to the first output from the block (2) and the block (4) for generation of pulses is also connected to the first output from the block (2), and the output of the block (4) are square pulses 1 ms/±5 V, and the first output 10 μs/±5 V and the second output 10 μs/±5 V are connected to inputs of the block (6) of logic elements, and another output of the block (2) monitoring electromagnetic interference is connected to the comparative element (5), the output of which is connected to the fourth input of the block (6) of logic elements, and the first output of the bloc (6) of logic elements is connected through the block (7) for modulation of pulses to the with the output as pulse 0 to 300 mV to the tested surface in the block (8) of the voltage divider surface/divider-resistor where output from this block (8) of the voltage divider surface/resistor-divider is connected through the block (11) of the voltage follower to the divider with very high input impedance to signal inputs of the first sample-and-hold amplifier (9) and of the second sample-and-hold amplifier (10), and the second input for control of sampling of the first sample-and-hold amplifier (9) and the second input for control of sampling of the second sample-and-hold amplifier (10) are connected with corresponding outputs for control of sampling of the block (6) of logic elements, and output of the first sample-and-hold amplifier (9) is connected through the block (12) of two inverting amplifiers connected in series to inverting input of the differential amplifier (13), and output from the second sample-and-hold amplifier (10) is connected to its non-inverting input, and the differential amplifier (13) is connected through the block (14) to eliminate accidental jitter of signal and the output block (15) with low impedance to the output from the equipment.