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About hhammer
since
11-12-2021
05-11-2022
hhammer
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04-12-2022
08:06 AM
I understand that the gas resistance differs for different sensor temperatures (e.g. 220°C or 350°C), but this is no explaination why the order in which I measure at differente temperatures would affect the gas resistance. Lets say I want to find H2S: I measure gas resistance at 250°C, afterwards at 280°C and again at 330°C, each time I measure for 100ms. As a result I get 3 gas resistance values corresponding to the three temperatures, but in my understanding they are not connect in any way to each other. So it would not have any influence if I measure at 250, 280, 330 °C or 330, 250, 280 °C, except for I have to wait until the sensor has reachted its temperature. The meaning if the heater profile is therefore unclear to me and it seems like nobody can really explain what the order of temperatures would matter for the measured gas resistance. Any specific hints are welcome!
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01-18-2022
08:44 AM
Thank you for the reply. I still don't quite understand why it would matter if I measure with two different profiles (e.g.150°C 180°C 220°C and 180°C 220°C 150°C). Both profiles cover up the same temperatures, but in a different order. I would expect the measured resistence to be fixed at a certain temperature, without beeing effected by the measurement taken before or after. So it is still unclear, wh the order of temperatures should have an influence on the measured resistance of the sensor? Maybe someone has a hint for me to understand the correlation. Thanks!
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11-27-2021
11:56 AM
In general I try to detect VOCs but would also want to increase the field of application to COx. Does this have an influence to the heater profile? I was wondering which physical effect the profile has in general. I understand the influence of the sensor temperature, but not its correlation with time.
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11-12-2021
09:03 AM
Recently I tried out the BME688, using the Bosch AI Software. For my understanding, the heater profiles do the follwing: The sensor heats up to a certain temperature, stays there for a certain time and takes the measurement. Then it heats up/cools down to next defined temperature and so forth. What is not clear to me yet, is the correlation between temperature and resistance for a certain mixture of gases FOR REPEATED MEARSUREMENTS. I know, that different compounds react differently at different temperatures with the surface of the sensor, but why would I for example want to measure the same temperature twice: 200°C 250°C 350°C 250 °C Wouldn't it be sufficient to measure every temperature once (and maybe vary the measuring time)? In the predefined heater profile I could also find some profiles with repeated measurements at low temperatures and some very short peaks with high temperatures. Are those peaks supposed to "burn" free the sensor?
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