Ultrasonic obstacle detector Massa ProductsThe Massa Model TR-2445/210 is an ultrasonic air transducer that operates
in the 210 kHz frequency region. It is encased in a solid plastic housing,
which results in a robust package with a completely sealed face.
The transducer is typically used in non-contact echo ranging applications
where either a single TR-2445/210 is used to first transmit a short duration
acoustic signal, and then receives the echo refected from a target; or two
separate transducers are used, one to transmit and one to receive. The
two curves below show how these transducers operate in these types of
echo ranging systems.
The System Echo Response Curve shows the typical voltage as a function
of frequency produced on the receiving transducer by an echo from a flat
target at a distance of 30 cm. The sound pulse was generated by applying
a 1 Volt electrical signal to the transmitting drive voltage.
The System Directional Response shows the relative reduction in the
received voltage produced by the echo as the target rotates to different
bearing angles. The maximum system response is at the bearing perpendicular
to the face of the transducer.
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