Dynamic data collection system and accurately positioning method for collection position

Abstract

The invention discloses a dynamic data acquiring system and a method for precisely positioning an acquiring position thereof. The dynamic data acquiring system comprises an FPGA controller, a step motor, a driving circuit of the step motor, and a position sensor. An FPGA controlling circuit sends direction and pulse signals to the driving circuit of the step motor and maintains a position counter. The driving circuit of the step motor receives driving pulses and direction signals and drives the step motor to move. In the moving process of the step motor, when the FPGA detects that the position sensor has the effective jump, the FPGA resets the position counter, and the position counter counts the sent pulses; after a sent pulse number reaches the set position pulse number of acquiring points and the effective condition of the pulses is detected, the data acquiring operation is carried out. The invention has the advantages of accurate positioning of the acquiring points, high real-time performance, automatic control, simplicity, reliability and lower cost.

Description

【Technical field】 [0001] The invention relates to positioning control in data collection, in particular to a positioning method therein. 【Background technique】 [0002] In the positioning of the stepper motor, for example, in a photometer that uses a filter wheel to achieve colorimetric measurement, the stepper motor drives the filter wheel to move, and it needs to be collected at a specified position during the movement to obtain measurement data. The accuracy of the location of the collection point directly determines the accuracy and repeatability of the measurement data. At present, in the application of data acquisition during the movement of the stepping motor, the location of the acquisition point mainly adopts the following methods: 1. Positioning directly through the pulse number of the stepping motor: a controller is used in the system to send a pulse signal to the drive circuit to drive the stepper motor. The motor moves, and a counter is maintained inside the co...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned method of direct stepping motor pulse positioning is controlled by software. Due to the uncertainty of software execution time, the motor drive pulse cycle will be uneven, and the motor will move fast and slow.

At the same time, the collection point will also change with the software execution time, resulting in the jump of the collected data

The positioning method of the shaft angle encoder improves the positioning accuracy of the collection point, but still has all the disadvantages of software control; and additional encoders are required, which increases the complexity of the system design and significantly increases the cost

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