Research into measuring DC/DC converters on the basis of quantum sensors
Students Name: Popovych Volodymyr Volodymyrovych
Qualification Level: magister
Speciality: Computerized Control Systems and Automatics
Institute: Institute of Computer Technologies, Automation and Metrology
Mode of Study: full
Academic Year: 2021-2022 н.р.
Language of Defence: ukrainian
Abstract: Nowadays, the problem of increasing the accuracy of DC measurement in the range of average values is relevant. In the master’s qualification work the measuring converters of a direct current (VPPS) constructed on the basis of quantum sensors (KD) are investigated. The considered measuring transducers have potentially high accuracy due to the use of quantum sensors in their construction. The conversion of "current - frequency" in such converters is carried out by converting the input current into the induction of the magnetic field by the primary converter (PP) and the subsequent conversion of induction into a frequency signal. The first transformation is carried out by a magnetic system (ampere solenoid or Helmholtz ring), and the next CD. The quantum sensor, which is considered in the work is built on the scheme of a spin generator with the working substance Cs133 in the gaseous state. The analysis of the literature showed that this type of VPPS should be built on a single-channel scheme using magnetic screens (ME) to protect the CD from the effects of external magnetic fields [1]. The master’s thesis considers ways to compensate for the effect of changes in temperature and residual magnetization of the ME on the resulting error VPPS. The temperature effect of the environment can be compensated by stabilizing the temperature of the magnetic system or by using thermally compensated Helmholtz rings. The effect of thermal compensation of the rings is achieved by using in the manufacture of their frame materials with different temperature coefficients of linear expansion. You can reduce the effect of the residual magnetization of the ME by selecting the mode of operation on the initial magnetization curve. [5]. The developed structure 11 and analytical expressions for the conversion factor of this type of VPPS are given in the work. The purpose of the study - to improve the measuring transducers of direct current built on the basis of quantum sensors. The object of research is the measuring conversion of direct current into frequency. The subject of research - high-precision DC-DC measuring transducers based on quantum sensors. As a result of work the following conclusions are made: 1. Based on the analysis of VPPS errors, it is established that one of the main factors determining the accuracy of conversion is the effect of temperature on the primary current converter in the induction of the magnetic field, which leads to changes in its geometric dimensions and as a consequence to change the conversion factor. 2. In order to reduce the current conversion error caused by the effect of temperature on the primary converter, it is advisable to stabilize the temperature of the primary converter and the inner layer of magnetic screens, and to use materials with a minimum temperature coefficient of linear expansion. 3. To compensate for the effect of temperature on the primary converter "currentinduction of the magnetic field" which is made in the form of Helmholtz rings can be used thermocompensated primary converter. The selection of materials and sizes of the base of the Helmholtz rings allows to compensate for the temperature error of the primary transducer. Key words - measuring transducer, spin generator, working substance, magnetic screens, residual magnetization. List of used literature sources. 1. Bobkov YM, Tomash MY, Garanyuk IP On the construction of precision converters and current stabilizers // Automatic and information-computing devices: Bulletin of the Lviv Polytechnic Institute, 1972.- №68.-S. 33-38. 12 2. Bobkov YN, Garanyuk IP etc. Quantum measuring transducers / Under the general editorship. Ph.D. Yu.N. Bobkova. – Lviv: Higher School Publishing Association, 1978. – 181p. 3. Bychkivsky RV, Zoriy VI, Stolyarchuk PG Fundamentals of metrological support: Textbook.- Lviv: Lviv Polytechnic State University Publishing House, 1999.-180p. 4. A.S. 2109191 (USSR). MS-type quantum magnetometer / Bobkov Yu.N., Garanyuk IP etc. -1976. 5. Garanyuk IP Residual field compensation system for magnetic screens in a current stabilizer with a quantum magnetometric transducer. Collection of scientific works of the Ukrainian Academy of Printing "Computer printing technologies" № 24, 2010.