The TMS sensors have a circular pattern of interdigitated
electrodes that utilize a fringing field to measure the material
in contact, similar to the fringing field measurement of our implantable
sensors. The electrodes are silver palladium embedded in a ceramic
substrate. The electrode spacing of 20 mils provides a fringing field
measurement penetration 20 mils into the material.
The constant geometry electrode pattern makes them
useful for applications in which sample thickness may vary. They
may be used with a filter in materials with conductive fibers such
as graphite. The fringing field measures the resin which saturates
the filter and not deep into the conductive composite. All TMS sensors
have a thermocouple located just below the sensor surface.
The Monotrode sensors consist of a single tool steel, chrome plated
electrode mounted in a ceramic substrate. The sensor electrode couples
with the opposite mold surface or the sensor sheath which acts as the
second electrode. A second sensor is not required. The Monotrode sensor
makes a bulk measurement - measuring through or deep into the part.
The monotrode sensor is designed for repetitive molding for such applications
as SMC/BMC/RTM. Most monotrode sensor have a thermocouple located just
below the sensor surface.
DFS sensors can be either TMS or Monotrode configuration and can be
used for liquid applications such as batch reactions or continuous
flow measurements in laboratory or production applications.
