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 Wysłany: Śro 12:30, 08 Gru 2010 Temat postu: ugg milano Hall displacement sensor temperature ch |
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Hall-temperature characteristics of displacement sensor
Permission to play a supporting role. The temperature corresponding to each specific voltage value has a corresponding displacement table table2, the first address of each table generated an address table table1, table2 table to store the offset of the first. When the ambient temperature input, run the temperature compensation program that will display the temperature parameters read into the buffer to generate the table table1 in the relative offset, then the first site to read the table table2 relative offset voltage generated by the physical Add, remove the table displacement, return to the main program measurement. The block diagram shown in Figure 3. Cream table Table 1 to read the first partial address site means lI II Ru Chi the United States relative to address when the partial address + address = physical address of the + partial taking Ling Yuan broom displacement correction value to obtain the value of 1 in Figure 3 d, Ju degree of temperature experiments and experimental results Type in the mercury contact carried out under constant temperature water bath. First, given a certain displacement position sensor, and then put it in the water bath tank, the outer cylinder to fill with water turn on the pump to speed up and down the water layer convection,[link widoczny dla zalogowanych], so there is constant within the cylinder measurement technology 1O 1998. Ng-11 of the temperature field. By adjusting the temperature controller gradually warming up, the thermometer read the actual temperature. The experiment temperature is increased by 2 Table 1 ℃ recorded data, Table 1 shows the temperature 14K2 ~ 32 ~ C of the experimental data. Temperature (℃) l416l82022g426283o32 analysis of the data in Table 1 shows the output voltage changes with temperature higher than a regular for the first set of data one by one 0.567mV 'C for a 18 ...' (7) and one black: 10. o85% ~ '~ fK1 a - a' ( For the second set of data are: a wing: a 0.0624% ℃ for a 1-1i two: a 'L b (9) V, the sensor temperature error of' sensor The output voltage is current, magnetic field B, the Hall voltage sensitivity coefficient K and a function of temperature. B for the rare earth permanent magnet of the residual magnetic flux density, displacement, and the magnet, pole spacing function to simplify the calculation, ignoring the type (2) get the next item in the R-type o) a Br (t) ・ G0) ・ 0) ・ KH0 ) * 0) (10) 1 where, G (f) a R - ~ (t) {3L (f )()+( t)]), logarithmic derivative of both sides have to: d-u (- t) one-dBr-(t) +-dG-(t) + Health! \The temperature coefficient current source external circuit can be adjusted to zero drift, so on where dl (t) / l (t) term is zero. guide bar and stainless steel shell, the linear expansion coefficient of uranium in a 0.5 × 1O ℃ First,[link widoczny dla zalogowanych], the magnet of the expansion coefficient of a 3.4 × 10 ℃ ~,[link widoczny dla zalogowanych], residual magnetic flux density of the temperature coefficient of eleven 0.103% ℃ ~, the temperature coefficient of the Hall voltage sensitivity of a woman +0.05% ℃ ~, guides to the top and center of the length of 25ram. According to the data in Table 1 No2, when the output is 0.94V, the corresponding displacement is 0.94ram, so there are d-r-(t )::--- a.,[link widoczny dla zalogowanych], q-XS0) o.94o.5 × lO a x25o.94 eleven 13.3O × 10 - (℃) (12) to G (f) logarithmic expression for the derivative of both sides have: dG ( t). dR (t). dL (t). dL (t) +2 as one by one ten one hundred and eleven 3 1 + -1. + + = 6.12 × 10 a ℃ for a one (13) the value of the above into (11) are: a 0.io3% + o.05% of a 13.30 × 1O eleven 6.12 × io one hundred and eleven o.0549 (% ℃) (14) This analysis of experimental data with the temperature The results are basically the same. From the above analysis, the Hall voltage sensitivity of the temperature coefficient and residual magnetic flux density between the temperature coefficient of the role of compensation,[link widoczny dla zalogowanych], and the sensor temperature error is mainly determined by the temperature coefficient of the two. RE Wing The temperature coefficient of magnetic materials widely distributed, if the wrong selection of samarium cobalt rare earth permanent magnet material, the temperature coefficient of remanence of a 0.05% ℃ ~, into (14), the temperature of the sensor error can be obtained for a 0.0019 % ℃ ~, an order of magnitude lower. References [1] Zhang Jin scratch shame. hopane mass displacement Seoul discretion of friction device. Instrument Technique and Sensor, 1997 (3) E2] Guozhen Qin. non-power electrical measurement. China Metrology Publishing Social .1990 E33 Zhao Qi Zhang and so on. microcontroller on the sensor application of temperature compensation clamor Computer Processing .1993 (3)
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