A Method of Calibrating Oxygen Concentration Using Impedance Spectroscopy
A technology of oxygen concentration and impedance spectroscopy, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of polluted environment, incomplete combustion, and lower furnace temperature, and achieve the effect of high sensitivity
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Embodiment 1
[0027] In this embodiment, a method for calibrating oxygen concentration by impedance spectroscopy is provided, the method includes the following steps:
[0028] S1, will be as figure 1 The oxygen sensor shown is placed in a furnace, wherein the oxygen sensor includes a double-layer structure formed by a dense diffusion barrier layer 3 and a solid electrolyte layer 4, and a first electrode 2 and a second electrode 5 connected at both ends of the double-layer structure , an electrochemical workstation 7 is connected between the first electrode 2 and the second electrode 5 .
[0029] S2. Heating the oxygen sensor located in the furnace to a set temperature. In this embodiment, the set temperature is 650° C., that is, the oxygen sensor is heated to 650° C.
[0030] S3. Fill the furnace with a detection gas with a known oxygen concentration. In this embodiment, a detection gas with an oxygen concentration of 5.3% is charged. The oxygen concentration mentioned herein is the volume...
Embodiment 2
[0072] In this embodiment, based on Embodiment 1, steps S1-S4 are repeated with 6 groups of different set temperatures respectively (in other words, steps S1 to S4 are repeated 6 times, and only the set temperature in step S2 has change), obtain 6 impedance spectra, and draw the impedance spectrum set corresponding to all set temperatures into a temperature comparison graph (see image 3 ). Among them, 6 different set temperatures include 650°C, 700°C, 750°C, 800°C, 820°C and 850°C.
[0073] in, image 3 The large figure in the figure shows that the set of impedance spectra corresponding to all set temperatures is plotted as a temperature comparison graph, while image 3 The small picture in the figure is an enlargement of the areas corresponding to 700°C, 750°C, 800°C, 820°C and 850°C in the large picture, that is, it shows 700°C, 750°C, 800°C, 820°C and 850°C more clearly The comparison of the corresponding impedance spectra.
[0074] From image 3 It can be seen that t...
Embodiment 3
[0077] In this embodiment, based on Embodiment 1, steps S1-S4 are repeated with 12 groups of detection gases with different oxygen concentrations (in other words, steps S1 to S4 are repeated 12 times, and only the oxygen concentration of the detection gas is different each time. change), to obtain 12 impedance spectra, and then draw the impedance spectra corresponding to all detected gases into an oxygen concentration comparison chart (see Figure 4 ). Among them, the oxygen concentrations of the 12 groups of detection gases are 0.2%, 1.2%, 3.0%, 5.2%, 6.8%, 9.1%, 10.9%, 13.1%, 15.0%, 17.1%, 19.0%, 20.9%.
[0078] From Figure 4 It can be seen that the intercept (ohmic resistance) of the intersection of the high frequency region and the real axis is almost constant, and the difference between the intercepts of the low frequency region and the high frequency region and the real axis (polarization resistance) increases with the increase of the oxygen content. increase. Moreov...
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Abstract
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