| Authors |
Zinchenko Timur Olegovich, postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: scar0243@gmail.com
Pecherskaya Ekaterina Anatolevna, doctor of technical sciences, associate professor, head of sub-department of information and measuring equipment and metrology, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: pea1@list.ru
Krainova Kseniya Yur’evna, postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: ksenya.kraynova.94@mail.ru
Golubkov Pavel Evgen’evich, postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: golpavpnz@yandex.ru
Sibrinin Boris Petrovich, senior lecturer, sub-department of information and measuring equipment and metrology, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: iit@pnzgu.ru
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| Abstract |
Background. The object of the study are spectrophotometers with manual control of the diffraction grating. The subject of research is the rotation system in spectrophotometers with manual control of the diffraction grating. The aim of the work is to develop an automatic system for turning a diffraction grating using a stepper motor.
Materials and methods. To describe the automatic system for turning the diffraction grating, structural, functional, and schematic diagrams of a stepper motor driver and a driver power control unit are developed. The software system is described in the Arduino language (based on the Wiring language) and the Arduino development environment (based on the Processing environment).
Results. An approach to the implementation of an automatic system for turning a diffraction grating, based on the use of a stepping motor, is proposed. This approach allows to significantly reduce the error of setting wavelengths, compared with equipment having manual control.
Conclusions. The proposed automated control system for spectrophotometric equipment makes it possible to increase the efficiency of the measurement process by upgrading the mechanical system, namely, by replacing the system of manual rotation of the diffraction grating with a system using modern stepper motors. On the shaft of the worm gear for controlling the rotation of the diffraction grating, a stepper motor is installed with a full step of 1.8o. In this case, the driver that controls the stepper motor allows you to work in microstep mode (1/8) from the step, which allows you to increase the number of motor steps by one turn 8 times, and also make the movement smoother and softer. The advanced automated spectrophotometer has a smaller error in setting wavelengths, compared with equipment that has manual control.
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| Key words |
spectrophotometer, diffraction grating, stepping motor, spectrophotometric method, absorption band, microcontroller
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