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284 results about "Sample Mode" patented technology

Optical fiber time frequency hybrid transmission method

The invention discloses an optical fiber time frequency hybrid transmission method. The method comprises the following steps that: a master station normally transmits a 10MHz frequency signal to a slave station, a narrow negative pulse is interpolated into a previous periodic signal high level within a whole second, and the frequency signal is calibrated in the whole second; the slave station restores the frequency signal by employing combinational logic and restores a timing signal through a trigger after identifying special calibration; the slave station simultaneously returns the received time frequency hybrid transmission signal to the master station in an original sample mode, wherein the hybrid transmission signal is used for the loopback time delay measurement of the master station; the master station restores the timing signal from the returned signal according to the method of the slave station, dynamically measures the time delay of the restored timing signal and a local timing signal, and combines with the fixed time delay of the equipment to calculate the phase precompensation of a frequency scale signal in one second; and the master station realizes uniform phase compensation in the next second by utilizing the calculated phase compensation, so that the restored frequency and timing signal of the slave station are synchronous with those of the master station. The optical fiber time frequency hybrid transmission method has the advantages of time service precision, low cost, convenient cascade connection and plug and play function.
Owner:PLA UNIV OF SCI & TECH

Online measurement system and method for organic chemical components in particulate matter

The invention relates to an online measurement system and method for organic chemical components in particulate matter. The system comprises a particulate matter cutter, an activated carbon diffusion pipe, a diffusion drying pipe, an electric three-way valve, a collection-thermal desorption device, a constant-temperature four-way valve, a sampling pump, a low-temperature cold trap, a gas chromatograph and other assemblies. In the measuring process, a sampling mode, a purging mode, a thermal desorption mode, an analysis mode and a temperature drop mode are adopted in sequence, the five working modes are switched automatically, continuously and cyclically, online trapping, thermal desorption and organic chemical component enrichment of the particulate matter are realized, and finally the gas chromatograph is adopted for conducting separation detection on the organic chemical components. The online measurement system and method have the advantages that online measurement is adopted; measuring time resolution is 30-60 minutes; a filter membrane used for particulate matter collection can be replaced, so that influences of residual matter during measurement are avoided; by the adoption of the 40 DEG C low-temperature cold trap, high-volatility organic components can be measured; the online measurement system and method are compact in structure, easy and convenient to operate, reliable in result and capable of being applied to measurement of the atmosphere and other particulate matter systems.
Owner:TSINGHUA UNIV +1

Monitoring a conductive fluid conduit

There is described an apparatus for monitoring a conductive fluid conduit arranged to carry a fluid stream. The apparatus comprises a power supply, a plurality of electrical contact points connected to the fluid conduit, a voltage measurement device, and a processor. The power supply has a reference mode of operation and a sample mode of operation. In the reference mode of operation the power supply is operable to supply an alternating electric current through the fluid conduit at a high frequency such that the current is confined near the surface of the fluid conduit due to the skin effect. In the sample mode of operation the power supply is operable to supply an electric current through a full thickness of the fluid conduit. The voltage measurement device is operable to measure the voltage between pairs of said electrical contact points so as to obtain reference values of electrical resistance of the fluid conduit when the power supply is in the reference mode of operation and so as to obtain sample values of electrical resistance of the fluid conduit when the power supply is in the sample mode of operation. The processor is operable to modify the sample values of electrical resistance based on the corresponding reference values of electrical resistance so as to compensate for temperature variations.
There is also described a corresponding method for monitoring a conductive fluid conduit arranged to carry a fluid stream.
Owner:TELEDYNE INSTR INC
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