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Testing Tool for Sensor Manufacturing

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... the US sensor market is expected to grow at an annual rate of 4.6%, to reach ... Green LED lights up which indicates the sensor passed the test. 11. 11/22/2006 ... – PowerPoint PPT presentation

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Title: Testing Tool for Sensor Manufacturing


1
Testing Tool for Sensor Manufacturing
ELG 4135 Electronics III Professor Riadh
Habash
2
Outline
3
Introduction
  • In todays business environment, the US sensor
    market is expected to grow at an annual rate of
    4.6, to reach approximate 7.6 billions by 2009.
  • Increased sensor demand will bring an increase in
    production and testing capacity.
  • Our objective is to design a tool and establish
    its technical requirements, in order to speed up
    the testing of sensors in the manufacturing
    process.

4
Background
  • Sensor is a device that responds to a physical
    stimulus, such as thermal energy, electromagnetic
    energy, acoustic energy, pressure, or motion,
    by producing an electrical signal.
  • Most sensors are electrical or electronic
    although other types exists.
  • Electrical voltage sensors vary in terms of
    performance, specifications, optional features
    and environmental operating conditions.

5
System Description
  • The system described will focus on testing
    electrical voltage sensors and all tests are
    assumed to be done at room temperature.
  • The system will test newly built sensors and
    compare it against a reference sensor known as a
    good sensor.
  • The testing tool will lit a green light for a
    Pass unit and a red light for a Fail unit.
  • The system consists of four stages differential
    stage, rectifier stage, comparator stage, and
    selection stage.

6
System Diagram
Tested Sensor
Pass
Threshold
Selector
Differential
Rectifier
Comparator
Reference Sensor
Fail
7
Design
Differential Block
Rectifier Block
Comparator Block
Selection Block
8
1. Differential Block
  • Potentiometers are used to simulate the sensors
  • Upper POT is the tested sensor
  • Lower POT is the reference sensor
  • Difference between two sensors is amplified (Gain
    30)
  • The difference can be either positive or negative

9
2. Rectifier Block
  • The input to the rectifier could either be
    positive or negative.
  • The purpose of the rectifier is to take the
    absolute value of the input voltage.

10
3. Comparator Block
  • The absolute value of the difference is compared
    to the threshold voltage.
  • The threshold voltage can be adjusted according
    to our specifications.
  • The output can either be positive or negative.

11
4. Selection Block (Pass)
  • If the input voltage is negative, Q1 is cut-off,
    Q2 is in the active region.
  • Green LED lights up which indicates the sensor
    passed the test.

12
4. Selection Block (Fail)
  • If the input voltage is negative, Q2 is cut-off,
    Q1 is in the active region.
  • Red LED lights up which indicates the sensor
    failed the test.

13
Selection Range
FAIL
FAIL
PASS
Reference _at_ 50
Maximum _at_ 55
Minimum _at_ 45
14
Selection Range (2)
15
Future Development
  • Develop the testing tool such that other types of
    sensors can be tested.
  • The testing tool can be made portable, so that it
    can be used in different locations.
  • Digital display can also be added for input and
    output observations.

16
References
  • Belusov, Alex Simple procedure test transducer
    EDN, March 1, 1996, pg 144
  • Frank Keys, All Types of Sensors,
    http//www-sensors.com/sensors-applications.html
  • Sensorsoft Corporation, Real-time Contract and
    Voltage Sensor Specifications, 2005-2006
  • Wikipedia, Sept. 2006, http//en.wikipedia.org/wik
    i/Sensors
  • Telecom Glossary 2K,
  • Feb.2001, http//www.atis.org/tg2k/_sensor.html

17
Thank You!
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