Fluorescense pressure calculation and thermocouple tools
ruby and more

pressure calculation

Mobile-friendly version is available here.

For android devices a stand-alone application is available on Google Play.

For iOs devices (iPhones and iPads) to make the mobile page available offline, click on this "magic" link and bookmark the opened page (you can then open this bookmark without internet connection).

Alternative ruby and Sm:SrB4O7 fluorescence online pressure calculators can be found on James Badro homepage

temperature calculation

Calculated values are exact when the cold junction is at 0 C. Temperature correction is valid for cold junction temperature not higher than 250 C.
B-type thermocouple works only above about 90 C, but is almost unsensitive to the cold junction temperature.

Ruby fluorescence



Pressure dependence of ruby shift is from
Dewaele A., Torrent M., Loubeyre P. and Mezouar M. (2008) Phys. Rev. B 78, 104102
Mao H.K., Xu J., and Bell P.M. (1986) J. Geophys. Res. 91, 4673

High temperature (T > 298) correction is from
Rekhi S., Dubrovinsky L.S., and Saxena S.K. (1999) High Temp. - High Pres. 31, 299

Low temperature (T < 298) correction is a two-range polynom

Thermocouple calculator
Select your thermocouple:

Cold junction T (C)

(C) = (K)

Thermocouple tables as PDF files
Thermocouple type:
Sm:YAG fluorescence

Calibration is from:
Hess N.J. and Schiferl D., J. Appl. Phys. 71, 2082 (1992).
Trots D.M., Kurnosov A., Boffa Ballaran T., Tkachev S., Zhuravlev K., Prakapenka V., Berkowski. M and Frost D., JGR:Solid Earth, 118, 5805 (2013)
Note: this calibration is valid without temperature correction at least up to 800 K.

Sm:SrB4O7 fluorescence

Calibration is from:
Rashchenko S.V., Kurnosov A., Dubrovinsky L. and Litasov K., J. Appl. Phys. 117, 145902 (2015)
Jing Q.M., Wu Q., Liu L., Xu J., Bi Y., Liu Y., Chen H., Liu S., Zhang Y., Xiong L., Li Y. and Liu J., J. Appl. Phys. 113, 023507 (2013)
Datchi F., Le Toullec R., and Loubeyre P., J. Appl. Phys. 81, 33333339 (1997)

Diamond anvil Raman

Calibration is from:
Akahama Y. and Kawamura H., J. Appl. Phys. 100, 043516 (2006).
Note: Raman signal should be measured at the center of culet. This scale is not valid to estimate pressure gradients.
Temperature correction is not known.
The "measured position" is the minimum of the Raman signal derivative (see image below).
Diamond Raman

Calibration is from:
Dubrovinskaia N. et al., Appl. Phys. Lett. 97, 251903 (2010).
Note: It is not a Raman signal from an anvil, it is a peak from diamond inside the sample chamber.