System and method for frequency division and counting of pulse signals of a rotary pulse encoder

Abstract

The invention discloses a frequency division and counting system and method of a pulse signal of a rotary pulse encoder. The method comprises: a rotary pulse encoder, a pulse signal transmission module, an FPGA frequency division counter and a PIV flow field test camera, which are connected in sequence. , and a data acquisition control computer and a PXI digital signal board connected with the FPGA frequency division counter; the PXI digital signal board is connected with a data acquisition board card, and is also connected with the data acquisition control computer. The frequency division and counting of the present invention improves the phase accuracy of the azimuth-triggered acquisition of the rotating signal.

Description

technical field [0001] The invention relates to the technical field of remote transmission and counting and frequency division of encoder TTL pulse signals, in particular to an application scenario in which a pulse signal of a rotary pulse encoder is used for external azimuth triggering in rotary signal acquisition, in particular to a rotary pulse encoder Frequency division and counting system and method of pulse signal. Background technique [0002] The long-distance (≥20m) transmission of the pulse signal of the rotary encoder is easily disturbed by the electrical environment, resulting in inaccurate measurement of the rotational speed. When frequency division or counting is performed on the pulse signal, the result is also greatly affected. [0003] In the rotation signal measurement, some signals are related to the rotation azimuth, so the acquisition of these signals is usually carried out by means of azimuth triggering. There are two ways to do this: one is to collect...

AI Technical Summary

Problems solved by technology

The former needs to divide the frequency of the encoder pulse signal, and use the frequency division signal to trigger the data acquisition system. In the past, we used the PXI digital signal board to divide the frequency and trigger the data acquisition through the bus. Due to the interference of the encoder pulse signal, in addition In addition, the time delay of the frequency divider on the PXI digital signal board is uncertain, which leads to inconsistencies in the starting azimuths of different acquisition data, and even different phases of the data of different turns in the same acquisition, which not only affects the accuracy and repetition of test data accuracy, which affects the dynamic signal analysis results of test data

In the latter test, because the azimuth angle cannot be locked, the test flow field data is not the data of the specified azimuth angle at all, and the repeatability accuracy is seriously affected.

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