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IntroductionWhat is a LVDTHow does a LVDT workLVDT ApplicationsWhy Digital?Digital LVDT (our project)Key Electrical ComponentsSoftwareQuestions. Outline. Company: Trans-TekCEO: Paul V. Mondazzi Location: Ellington, CTTrans-Tek specializes in building - LVDTs, - ADTs
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1. Senior Design IDigital LVDT (Linear Variable Differential Transformer)
2. Introduction
What is a LVDT
How does a LVDT work
LVDT Applications
Why Digital?
Digital LVDT (our project)
Key Electrical Components
Software
Questions
Outline
3. Company: Trans-Tek
CEO: Paul V. Mondazzi
Location: Ellington, CT
Trans-Tek specializes in building
- LVDTs,
- ADTs (angular)
- LVTs (velocity)
Introduction
4. Electrical transformer used for measuring linear displacement
What is a LVDT?
5. LVDT Applications
6.
It requires no periodic calibration.
Its accuracy, resolution, and linearity does not change with time.
No onsite calibration
Eliminates the need for expensive error prone analog to digital conversion
Conversion to calibrated units
Why Digital?
7. Objective:
-To design a marketable digital output LVDT for industrial applications
General Highlights:
Internal microprocessor scales output into calibrated engineering units and provides unique, serialized calibration for unit identification
Interchangeability without calibration
Internal MIN, MAX and TIR functions store high and low readings at maximum update rates
Internal tare and zero function allows unipolar and bipolar output, i.e. user programmable
Support Software with GUI
Researching competitors designs
LVDT Project
8. Microcontroller (candidate Pic16F870)
200 nanosecond instruction execution
only 35 single word instructions
5 channels of 10-bit Analog-to-Digital (A/D) converter
64 bytes of EEPROM data memory
2 timers
Design Choices
9. Connection type: USB vs RS-485
USB
Easy to use
Inline power
Small connections
Limited to ~15 feet from the device
RS-485
Spans up to 4000 feet
2 wire connection
No power
Larger connection than USB
Design Choices (cont.)
10. Ordering competitors products to reverse engineer
Specs sheets available to us
Research the approximate size of the housing
Find out competitors price range (allowing us to create a realistic budget)
Researching Competitors
11. Key Electrical Specs
12. Visual Basic
Easy to use GUI
MIN, MAX and TIR functions
All the data will be transferred to a word file
No onsite calibration is desired
15 bit (min.)
USB or RS-485
Internal tare and zero function allows unipolar and bipolar output
Software
13. Spring Semester:
Preliminary Conceptual Design -March 24
Component research and ordering -March 31
Circuit Prototype (protoboard) -April 26
Fall Semester:
Surface Mounted Layout
Software Development
Final Design
Time Line
14. Research Budget
$1000 (not final)
This in addition to the purchase of the competitor’s LVDTs
Production Budget
Estimated $150 restraint on the production of each individual circuit
This includes parts and labor
Budget
15. Questions ???