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Angle photoelectric encoder counting circuit based on GPIO

A photoelectric encoder and counting circuit technology, applied in instruments, optical devices, measuring devices, etc., can solve the problems of high detection speed, no serial interface, and inability to use standardized modules, so as to improve data reading. The effect of taking speed

Inactive Publication Date: 2015-12-16
YUNNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, standardized modules cannot be used in the following situations: 1. When the main control computer does not have a serial interface; 2. The detection speed is required to be high, and the transmission speed of the serial port cannot keep up with the change of the angle; 3. For no MCU with counting interface

Method used

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  • Angle photoelectric encoder counting circuit based on GPIO
  • Angle photoelectric encoder counting circuit based on GPIO
  • Angle photoelectric encoder counting circuit based on GPIO

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The angle measurement of the polarimeter adopts the 2000-line incremental encoder H38S, and the I / O board adopts the MP401L 8-way IO board of Shuangnuo, and uses its D / A output as the chip selection signal. The angle change is collected by the angle sensor, and then the circuit realizes the counting of the angle and outputs it to the IO port of MP401L, and is converted into the corresponding optical rotation angle value through calculation in the main control computer. The operating system of the host computer is WindowsXp, and the control of MP401L is realized by programming with Delphi6.0. The measured substance is a glucose solution with a fixed concentration. Distilled water was first injected into the sample chamber for zero point calibration, and then the sample glucose solution was injected at different times for optical rotation detection. Image 6 As a result of the detection, it can be seen that the angular deflection of the three measurements is basically th...

Embodiment 2

[0030] The angle measurement of the polarimeter adopts the 2000-line incremental encoder H38S, and the I / O board adopts the MP401L 8-way IO board of Shuangnuo, and uses its D / A output as the chip selection signal. The operating system of the host computer is WindowsXp, and the control of MP401L is realized by programming with Delphi6.0. The on-line detection cell is fixed in the detection chamber of the polarimeter, and the inlet is connected to the output end of the liquid-phase chiral separation column. Inject different concentrations of Trogel's base with a micro-injector, the mobile phase is a perchloric acid solution with a pH of 2 and ultrasonically degassed through a 0.45 μm filter membrane, and the flow rate is 0.5 mL / min. Measure the chiral resolution profile for Trogl's base, Figure 7 for the split result. It can be seen that the deflection angle changes with time, the left-handed substance appears first, and the right-handed substance appears later. The change in...

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Abstract

An angle photoelectric encoder counting circuit based on GPIO is characterized in that (1) a D trigger with the model number 74LS74AN and 2 NAND gates with the model number 74LS00N are used to form a phase discriminator so as to identify the signal of plus, subtraction and zero; (2) 3 counting chips with the model number 74LS193 are connected in series to form a counting circuit and the counting sum is 2<12>=4096 grade; (3) 2 bus reuse chips with the model number 74LS 193N are used to realize output signal reading; (4) the circuit power supply is +5V stable voltage to provide LED power supply indication. The beneficial effects are that 1 the problem of reading data by the photoelectric encoder when a host computer has no serial interface is solved; 2 the problem of limited GPIO data bus of the host computer is solved: in the invention, 9 IO parts can be used to read a 12 bit coding signal, and the data can be read when the IO bus is limited; 3 the serial port reading mode is abandoned and GPIO data reading mode is adopted, therefore data reading speed can be raised, and the invention can be applied in angle measurement where change is frequent.

Description

technical field [0001] The invention discloses a photoelectric encoder counting circuit, which is applied to the angle counting of the photoelectric encoder in an optical rotation detector. The circuit is a key circuit for polarization angle measurement in the optical rotation polarization detection technology, and belongs to the technical field of photoelectric detection. Background technique [0002] In the angle measurement technology, the angle measurement is usually performed by a photoelectric encoder disc. In order to improve the accuracy of angle detection, an integrated incremental photoelectric encoder with higher angular resolution is used. This solution will be integrated with components related to angle measurement, which can ensure high measurement accuracy. The output of the device is in the form of pulses. Every time a minimum angle is rotated, the encoder output jumps once, and the output of forward and reverse rotations corresponds to two different pulse ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26
Inventor 李宏宁袁黎明
Owner YUNNAN NORMAL UNIV
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