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High Field Fiber Optic Temperature System

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High Field Fiber Optic Temperature
Part #: FOTS200

Stand-alone High Field Fiber Optic Temperature System

The FOTS200 is a single-channel* AccuSens signal conditioner specifically designed for measuring physiological temperature. Interface with TSD380 and TSD381 transducers for high field strength MRI applications.

  • 20 Hz sampling rate
  • RS-232 output interface
  • ±5 V analog output
  • AC wall adapter

This is a stand-alone system, but it can also be interfaced to BIOPAC Data Acquisition Systems; ships with BIOPAC interface cables CBL122, CBL102, and CBL106 to interface one channel to MP160, MP150, or MP100 Research Systems. Click “Details” tab for more information.

*4-channel and 8-channel modules are available—contact BIOPAC to discuss.

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Part #: FOTS200
Categories: MRI Magnetic Resonance Imaging - Research
Subcategories: Amplifier Modules - Research

Equivalents
With a different Platform

Details

Compatibility


The FOTS200 ships with BIOPAC CBL122, CBL102, and CBL106.

  • CBL106 + CBL102 + CBL122 can be used to connect to either an AMI/HLT or UIM module.
    • Optional cable combination for AMI100D/HLT100C is CBL106 + CBL123 (not included).
  • For the multiple channels for the COM/ground connection, users can “stack” the black common pins of multiple CBL106.
  • If a user is using more than one temperature sensor, they will need one of those cable combinations per temperature channel being recorded.

Analog output

Parameters: scale factor and the offset.

The scale factor corresponds to the physical unit per Volt (unit/V) output by the system, while the offset corresponds to the physical value at which the user wants the analog output to be at zero volt. For example, with a scale factor set to 10 °C / V and the offset set to 5 °C, the temperature as a function of the analog output voltage is given by:

Temperature = [Voltage output] x 10 °C / V + 5 °C

The default value of the scale factor is 50 °C / V (or its equivalent in °F) and the default value of the offset is 0 °C (or its equivalent in °F).

During a No Signal condition, constant values are output as follows: analog output value = 0 Volt, RS-232 serial ports = 65 536.0.

Magnetic Sensitivity

Comparison of FOTS Signal Conditioners available from BIOPAC:

FOTS100

  • Pico-M signal conditioner—GaAs temperature sensing technology

When exposed to strong magnetic field, the GaAs sensor used with the FOTS100 will see an artificial shift in temperature :

Magnetic field                   Shift in T° (approximately)
0 T                                         0 °C
1.5 T                                      < 0.2 °C
3 T                                         -0.4 °C
7 T                                         -2.5 °C
9.4 T                                      -4.5 °C

This shift does not depend on field orientation and is very reproducible in a given setup, hence it can be easily factored out by the user.

The values at field strength come from the following article: Buchenberg, W.B., Dadakova, T., Groebner, J., Bock, M. and Jung, B. (2015), Comparison of two fiber‐optical temperature measurement systems in magnetic fields up to 9.4 Tesla. Magn. Reson. Med., 73: 2047-2051. doi:10.1002/mrm.25314

FOTS200

  • AccuSens signal conditioner—WLPI temperature sensing technology
    • WLPI stands for “White-Light Polarimetric Interferometry”

The TSD380 series sensor probes associated with the FOTS200 readout unit have an optical sensing element that is insensitive to magnetic field, hence, there is no maximum magnetic field specification, which is a nice advantage in high-field MRI applications.

However this technology has some disadvantages: it is more expensive; the probe cannot be made to a diameter smaller than 1.2 mmm O.D.


For more details, please see the complete FOTS200 User Manual,
available under the Support tab.

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