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.
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.
Comparison of FOTS Signal Conditioners available from BIOPAC:
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)
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
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.