ATLAS Wire Tension Measurement system

The system uses electrostatic force to excite mechanical oscillation around the wire fundamental harmonic resonance

The oscillation amplitude is sensed by measuring the capacitance variation in the wire-tube system

Changing the high voltage modulation frequency mechanical resonance curve

Fully operated by a PC LabVIEW program

WTMTim ing unit

&ADC /DAC R/W

Tim ing unit

C o ntro l

C PU

&

RS232 inte rfa c e

PC se ria l p o rt

Se nso rM DT 1 C o m p a ra to r

HV m o d ula to r HVPo we r sup p ly

Sc a le r 1

Sc a le r 2

Se nso rM DT 2 C o m p a ra to r

Sc a le r 1

Sc a le r 2

Se nso rM DT 15 C o m p a ra to r

HV m o d ula to rHV

Po we r sup p ly

Sc a le r 1

Sc a le r 2

Se nso rM DT 16 C o m p a ra to r

Sc a le r

Sc a le r 2

System

bus

1

HVM o d ula to r

HVM o d ula to r

HV OFF

HV ON

Measure = fout (HV OFF) – fout (HV ON)

WTM

internal view

Sensor and HV modulation connections

RS 232 and T sensor connections

WTM

Control

panel

Parameter

setting

section

Output

section