Multipath continuous data acquisition device of two-channel microwave density and humidity detector and data acquisition method using the same

Abstract

The invention discloses a multipath continuous data acquisition device of a two-channel microwave density and humidity detector. The device comprises an A / D converting circuit, a data buffer circuit, a microprocessor, an external interface circuit, a programming logic device, a work state indicating lamp and a host computer and the above units are orderly connected. The programming logic device is respectively connected to the A / D converting circuit, the data buffer circuit, the microprocessor and the external interface circuit. The microprocessor is connected to the host computer through a RS232 interface and is connected to a cigarette making and plug assembling machine through a CAN interface. The programming logic device is connected to the cigarette making and plug assembling machine through a RS485 interface. The invention also provides a data acquisition method using the multipath continuous data acquisition device. The method comprises receiving a signal of the cigarette making and plug assembling machine through the programming logic device, controlling all circuits and producing an interrupt signal through the programming logic device, determining the interrupt signal through the microprocessor, reading the A / D sample data and carrying out computation through the microprocessor, uploading the computation result to the cigarette making and plug assembling machine and after an interrupt revocation signal is received, carrying out secondary data acquisition computation. The device and method realize real-time high-efficiency continuous sampling and computation.

Description

technical field [0001] The invention relates to the technical field of data acquisition, in particular to a multi-channel continuous data acquisition device and method for a dual-channel microwave density and humidity detector. Background technique [0002] Modern crimping equipment is moving towards high speed, high quality, and high intelligence. The promotion of ultra-high-speed crimping units is the development direction of the tobacco industry. The weight of cigarettes is a basic quality index of cigarettes. The measuring principle of the dual-channel microwave density and humidity detector is under the control of the microprocessor. The difference in moisture content causes the energy parameters of the microwave electromagnetic field to change. This change is detected by the detection circuit, and the data acquisition of the detection voltage is completed by the industrial control board. Then, according to the relationship between it and the moisture content of the tob...

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Problems solved by technology

[0003] At present, the measurement method of the dual-channel microwave density and humidity detector is timing interrupt sampling, and its rate is far lower than the high-speed production requirements of the coiler. Completion of calculations and output of control signals in real time before the next collection of data arrives. The sampling rate of each channel can reach up to 10,000 times per second. At the same time, the production speed of the coiler can be fast or slow. In order to ensure the efficiency of data collection and consider Microprocessor resources are occupied, which requires that the rate of data acquisition must be continuously variable with the production speed of the coiling unit

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