AC Excitation for an Inductive Transducer

[MuhammadShazor]

Hello Everyone,

I am working on an inductive transducer which outputs voltage. It requires an AC excitation of +- 10V  and 5KHz frequency. 

Any one know which supply i can used ?

Thanks

[Henrik_Volkers]

What type of sensor? A LVDT?

In that case you need to measure the exitation voltage and the output voltage to get the phase.

What current do you need?

How stable you need the 10Vac?

A cheap source would be the soundcard or an analog output of a Multi IO DAQ followed by an (sound) amplifier (depending on the sensor/current maybe a transformer and the headphone output is fine)

I think there is a CDAQ module (not NI made, but compatible) build for LVDTs.

[MuhammadShazor]

Hello Henrik,

I am using Displacement Transducer from HBM ( https://www.hbm.com/en/0236/displacement-sensors-and-displacement-transducers/).

Transducer Specification:

1. Nominal Displacement = +- 1mm

2. Nominal Output Span  = 80 mV/V

3. Nominal Excitation Voltage = 2.5 Veff

4. Excitation Voltage Operating Range = 1 Veff to 6 Veff

5. Carrier Frequency = 5 kHz

I did not find any current rating so i believe it might be pretty small. 

May you please let me know which CDAQ module build for LVDTs.

Along with this, If i use sound card output then i will need analog input and analog output module.

Thanks

Muhammad Shazor

[Henrik_Volkers]

That is an LVDT 🙂

Best option (in my view): Buy that sensor with the internal electronic option.

Output and supply will be VDC,

The usual signal conditioner for a LVDT can be buyed seperately. *

CDAQ modul ... no idea ... I remember I have seen something like this .. maybe 2 years ago?? *

*)A search engine is your friend. 😉

HBM have a series of AC bridge signal conditioners, that allow to read (strain) bridges and LVDTs ...

If you know how that sensor works, you can solder an adapter for your soundcard and write a software to run that sensor. individual calibration migth be needed ....  nice project for a student .. but far from a professional solution (you never know what the windows system thinks it need to do with the sound in- and output).