Re: Flight Computers and Temperature

Larry Curcio wrote:

It occurs to me that temperature measurement is a useful
addition to flight computers. Not only is it intrinsically
interesting, it can be used, in very high altitude flights, to
detect atmospheric layers.Layer boundaries are important
in the accurate interpretation of barometric data, and in the
accurate rendering of Cd curves from accelerometer data.

Does anyone know of such instruments? Has anyone flown
them. And... uh... has anyone any data from them???

Thanks and Regards,
-Larry (even low altitude data...) Curcio





As a side note, my main business deals with accurately measuring pressures in the petroleum industry. You would be amazed (or perhaps not) at how much a temperature difference can change the pressure reading from a given sensor. In other words, a pressure sensor at low temperature will give a different reading than the same sensor at the same pressure at a higher temperature. In my line of work, any pressure reading has to be coordinated with its associated temperature reading, then an algorithm is applied to the two numbers to arrive at the 'corrected' pressure (and the individual calibration is unique to each sensor). Again, this interaction can be pretty significant.

While this is overkill for current rocketry applications, it may well be the way the things are headed, so the ability to (as an initial step) store a temperature reading with the pressure reading is probably a good thing...

David Erbas-White
.

Relevant Pages

  • Re: Motorola MPX4115A pressure sensor
    ... Is the sensor absolute or relative pressure? ... temperature, and altitude so yes it will vary some even if temperature ... reading that on your DVM. ...
    (sci.electronics.design)
  • Re: Flight Computers and Temperature
    ... That is for absolute readings. ... But altimeters report a difference between one reading and another. ... > Even in a tropospheric flight, ground temperature alone can ... a pressure sensor at low ...
    (rec.models.rockets)
  • Re: Flucuating Outside Temps
    ... > reading varies widely at highway speeds. ... the temperature readings are stable and appear to be correct. ... > anybody tell me where the sensor is physically located. ... If you think it is not reading correctly, ...
    (rec.autos.makers.chrysler)
  • Re: More on my GoodYear Marathon tires
    ... This caused a significant increase in operating temperature. ... pressure loss was slight, ... In this case, a pressure sensor, if it signaled a ... would be valuable to install sensors in your tires that measure ...
    (rec.outdoors.rv-travel)
  • Re: More on my GoodYear Marathon tires
    ... This caused a significant increase in operating temperature. ... pressure loss was slight, ... In this case, a pressure sensor, if it signaled a ... would be valuable to install sensors in your tires that measure ...
    (rec.outdoors.rv-travel)
Loading