Browse Prior Art Database

Enhancement of Signal-to-Noise Ratio in Transducer-Based Temperature Measurement System

IP.com Disclosure Number: IPCOM000112644D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 130K

Publishing Venue

IBM

Related People

Ghotbi, R: AUTHOR [+3]

Abstract

A novel, low-cost, simple yet effective method of reducing the noise introduced in transducer instrumentation systems designed to measure temperature in electronic and industrial processes and systems is disclosed. This method achieves a superior signal-to-noise ratio compared to the arrangements typically used in present systems.

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Enhancement of Signal-to-Noise Ratio in Transducer-Based Temperature
Measurement System

      A novel, low-cost, simple yet effective method of reducing the
noise introduced in transducer instrumentation systems designed to
measure temperature in electronic and industrial processes and
systems is disclosed.  This method  achieves  a superior
signal-to-noise ratio compared to the arrangements typically used in
present systems.

      There are many applications in which a transducer is located
near the source of the physical quantity that is being measured.
Physical constraints often do not allow the instrumentation and
signal-conditioning electronics to be located near the transducer,
which leads to a considerable distance between the transducer and the
instrumentation electronics.  As shown in Figure (a), the transducer
2 is located in the vicinity of the object 1 to be measured, while
the instrumentation electronics 3 are located a considerable distance
away.  The Signal-to-Noise Ratio (SNR) of the overall system is
reduced due to disadvantages of such a system.  Note that proximity
between the signal source (the transducer) and the instrumentation
electronics is very desirable, since it leads to superior performance
of the overall setup.  In order to increase the overall
signal-to-noise ratio, one must place a large gain block as close to
the transducer as  physically possible.  However, such an arrangement
is often impractical, since it requires the addition of conductors to
supply power to the instrumentation electronics.  The required length
of such conductors causes the conductors themselves to become
sources  of additional noise pick-up.

      This invention will enhance the signal-to-noise ratio of the
output This invention will enhance the signal-to-noise ratio of the
output signal of the instrumentation electronics connected to the
transducer by allowing the instrumentation electronics to be in
physical proximity of the transducer, thereby decreasing the effects
of noise throughout the  system.  The preferred embodiment is shown
in Figure (b).  As can be seen in this figure, the instrumentation
electronics 3 may be placed very close (physically) to the transducer
2.  The power requirements of the instrumentation electronics can be
satisfied by using a Thermo-Electric Cooler (TEC) 4.  The TEC is
typically used  in applications where power is applied to it, and the
TEC will then transfer thermal energy from its bottom surface to its
top surface (usually equipped with heat sinks or other  similar
fixture).  In this application, however, the TEC is absorbing ...