Hello,
I'm working with the EVM430-FR6043 and using the USS Gas Demo firmware. I have a question regarding the correct configuration of the transducer spacing.
From what I understand, instead of specifying the physical distance L between transducers, the firmware expects the user to set the acousticLength parameter — which represents the time of flight (TOF) at a known reference temperature.
I found the following in the documentation:
> acousticLength
> float _USS_Meter_Configuration_::acousticLength
> Acoustic length in usec at room temperature.
However, the documentation does not define what "room temperature" actually means — whether it's 25 °C, 20 °C, or something else.
Could you please clarify:
1. Is it correct that acousticLength replaces the need to specify the physical distance L?
2. What exact temperature is assumed for "room temperature" in this context?
3. Does the USS library assume a fixed reference temperature internally, or is there a way to specify the temperature at which acousticLength was calculated?
4. How critical is this reference temperature for accurate flow measurement in gases? Since speed of sound in gas is highly temperature-dependent, I want to avoid systematic errors.
I’m trying to ensure that my configuration is physically consistent and that the flow calculations are accurate.
Thanks in advance for your help!
Best regards,
Igor