The main results of RETwix complex development are presented in the paper. RETwix is an universal hardware and software complex for laboratory research, which can be used for investigation both electronic components and arbitrary electrical, thermal, chemical or biochemical processes. Sensors, actuators and signal transducers of the analog front end are used for this purpose. The RETwix complex includes two CV-LAB devices (Capacitance and Voltage LABoratory) and UA-LAB (Universal Analog LABoratory). The principle of measurement transformation and examples of using the RETwix complex are presented.
The concept of constructing functionally integrated sensors of thermal quantities is formulated on the basis of calorimetric methods of investigation, the novelty of which is the usage of components of solid-state microelectronics and multifunctional signal converters. The analysis and selection of organic materials has been carried out, and the green colored OLED has been formed with good output characteristics for temperature sensors. The spectral analysis of proposed structures is represented and the method of their obtaining is selected.
The correction method of dynamic characteristics of temperature measuring devices is proposed. It is based on the measurement of the RTD’s resistance value at a certain moment of the beginning of the transition process with subsequent calculation (by developed algorithm) of the given RTD’s resistance value corresponding to the measured temperature value. The structural scheme of the thermoresistive converter with the RTD pre-heating to the initial temperature value of the measuring range and with microprocessor calculation of the measured temperature value has been developed. The accuracy of temperature determination in this case is mainly determined by the accuracy of temperature measurement at a time instant t of the transition process beginning chosen less than the time constant of the RTD t <τ . It has been found that the proposed temperature measuring device provides the measurement accuracy of 0.05 °C at the measurement time t=0.1τ.
In this paper, the method of linearization of the transfer function of the resistive temperature transducers based on bridge circuit is proposed. The method is based on the formation of compensation supply voltage of the bridge circuit linearly dependent on measuring temperature. The schematic diagram of the resistive temperature transducer with the analogue linearization of the transfer function is developed. The proposed method allows reducing the nonlinearity error of the resistive temperature transducer to less than 0.1 °C over the temperature measuring range of 0…800 °C.
KEYWORDS: Temperature metrology, Resistance, Measurement devices, Resistors, Time metrology, Surgery, Amplifiers, Switches, Transducers, Medical devices
A method of reducing measuring time of temperature measurements of biological objects based on preheating the
resistance temperature detector (RTD) up to the temperature close to the temperature to be measured, is proposed. It has
been found that at the same measuring time, the preheating allows to decrease the measurement error by a factor of 5 to
45 over the temperature range of 35-41°С. The measurement time is reduced by 1.6-4 times over this range, keeping the
same value of the measurement error.
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