Linearizing transducer characteristics

Design of a high precision temperature measurement system based on artificial neural network for different thermocouple types

“…Using the second method, sensor nonlinearities can be compensated by means of arithmetic operations, if an accurate sensor model is available (direct computation of the polynomials), or with the use of a multidimensional look-up table. Direct computation of the polynomial method is more accurate but requires a longer time for computation, while the look-up table method, though faster, is not very accurate [4][5][6][7].…”

“…Therefore, sensor modelling and linearization techniques are necessary. To solve the problem of linearizing a sensor, there are two methods generally used; the first one requires nonlinear analog circuit and the second uses numerical methods that are computed by microprocessor or computer [1][2][3][4]. Analog circuits are frequently used for improving the linearity of the sensor characteristics, which implies additional analog hardware and typical problems particular to analog circuits such as temperature drift, gain and offset error.…”

Implementation of software-based sensor linearization algorithms on low-cost microcontrollers

“…The most applied method is traditional look-up table (LUT) based linearization. This algorithm can be implemented on each microcontroller [2,5]. In this method, the result of the ADC is used as an index into an array that stores the corrected data points [6,8].…”

“…URL: http://www.baskent.edu.tr/ ∼ herdem/. circuit interposed between the sensor and an analog to digital conversion (ADC) module [4,5]. The next two methods, involving software, can be implemented by using a computer and a floating-point digital sinal processor (DSP), but implementation of these methods on low-cost controllers supporting only simple mathematical operation is a design challenge due to the limited capacity of the controller.…”

Approximation and Correction of Measuring Transducer’s Characteristics

“…The need to adjust the form of information about the measured value to human perception possibilities, or to simplify the further processing of measurement information generally requires such adjusting of the slotted line element characteristics so that the resultant characteristics of the slotted line is linear, with assumed error, in the adopted coordinate system. (Bucci et al, 2000;Grzybowski @ Wagner, 1971;Iglesias @ Iglesias, 1988;Patranabis et al, 1988;Patranabis @ Ghosh, 1989) When the measuring transducer's characteristics is very non-linear, for example in the case of certain transducers for light intensity measurement, a problem with selecting a relevant A/D transducer may occur. All methods of correcting measuring transducer's characteristics cannot eliminate the error related to insufficient A/D transducer resolution.…”