45results about How to "Easy and accurate collection" patented technology

The present invention discloses one kind of on-line fatigue work early-warning system and method with standardized criterion, convenient use, accurate judgment on fatigue state and capacity of early warning and preventing accident. The on-line fatigue work early-warning system has the structure comprising a power source, an alarm device, an eye image acquiring device, a breath and heart beat information acquiring device, a training and controlling interface and a fatigue identifying device connected to all the forgoing devices.

The invention discloses a pipeline cleaner positioning system and method, and belongs to the field of oil gas pipelines. The pipeline cleaner positioning system comprises a first pressure transmitter,a second pressure transmitter, a first signal collector, a second signal collector, a signal processor and an electric source, wherein the first pressure transmitter is arranged at the upstream end of a target pipeline; the second pressure transmitter is arranged at the downstream end of the target pipeline; the first signal collector is electrically connected with the first pressure transmitter;the second signal collector is electrically connected with the second pressure transmitter; the signal processor is connected with the first signal collector and the second signal collector; the electric source is used for supplying electricity for the first pressure transmitter, the second pressure transmitter, the first signal collector, the second signal collector and the signal processor; andan upstream pressure signal and a downstream pressure signal are obtained from the first signal collector and the second signal collector by the signal processor, and are respectively treated into anupstream pressure value and a downstream pressure value, the upstream pressure value and the downstream pressure value are treated, and if a pre-set mutation value exists in the upstream pressure value and the downstream pressure value, positioning on a pipeline cleaner is performed by the signal processor. The positioning method of the pipeline cleaner positioning system disclosed by the invention is high-efficiency, accurate and simple, and monitoring the running state of the pipeline cleaner in a real-time manner is convenient.

The invention provides a brushless direct current motor position detection circuit. The detection circuit can conveniently and accurately collect a brushless direct current motor rotor positioning signal. The detection circuit comprises a brushless direct current motor body; the brushless direct current motor body comprises a stator and a rotor; the stator is mounted in an iron core wiring duct through multiple phases of windings; the windings in each phase of the stator are coiled with corresponding coupling coils; the coupling coils are in star connection; the detection circuit comprises a direct current power supply and a signal sampling circuit; and the input end of the signal sampling circuit is connected with the coupling coils. The brushless direct current motor position detection circuit is based on a principle that the coupling coils output variable phase voltage due to induction; the induced voltage by the coupling coils is in direct proportion to the phase voltage amplitude of the brushless direct current motor, so that the induced voltage and the phase voltage amplitude are consistent in phase; the coupling coils are in star connection, so that the states of the connected coupling coils are equivalent to the states of the corresponding phases of the brushless direct current motor; and a star circuit formed by the coupling coils is fully isolated from a phase line of the brushless direct current motor, so that interferences generated in the operating of the brushless direct current motor are isolated.