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Fiber Optic Temperature System

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Fiber Optic Temperature System
Part #: FOTS100

Stand-alone Fiber Optic Temperature System

FOTS100 includes control unit with RS-232 port, ± 5 V analog output, and rubber boot; power via included 12 volt wall adapter.

This stand-alone system can be interfaced to BIOPAC MP Systems using the specified cable(s), purchased separately:

MP160 System: add CBL101 3.5 mm mono phone plug to male RCA + CBL122 Unisolated RJ11 to 3.5 mm Jack

MP150 or MP100 System: add CBL101 3.5 mm mono phone plug to male RCA

MP36/35 System: add SS70L isolated BNC interface and a BNC-to-RCA cable (separate purchase).

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Fiber optic temperature
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Part #: FOTS100
Categories: MRI Magnetic Resonance Imaging - Research
Subcategories: Amplifier Modules - Research

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The analog output parameters comprise the 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.

For more details, please see the complete FOTS100 User Manual, available under the Support tab.

Use with high-accuracy, fiber optic temperature probes for use in MRI (separate purchase):

Rectal Temp Probe: 300 µm OD Polyimide tubing – TSD180 8 m or TSD182 3 m

  • The Polyimide round tubing protects the sensing element its flexibility and rigidity provide excellent pushability.

Surface Temp Probe: sensor 1 mm OD, PFA tubing 0.9 mm OD – TSD181 8 m

  • cable sheath rated up to 85 °C.
The glass tube at the end of the probe provides a robust protection over the sensing element as well as a firm connection from sensor to cable.

Note: FOTS100, TSD180, and TSD181 are suitable for MR field strength of 3T and lower; see FOTS200 with TSD380 and TSD381 transducers for high field strength MRI applications.

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 FOTS100 User Manual,
available under the Support tab.

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