What does this OpAmp circuit do?

[mhsn]

Hi,

I have a board to measure resistance of a dental canal.
I want to know what's the exact job of elements in this circuit.

The PCB:
[url=http://www.hotimg.com/image/aY2DCpE][img]http://t.hotimg.com/ts/aY2DCpE.png[/img][/url]

Schematic from PCB:
[url=http://www.hotimg.com/direct/8XUzURZ.png][img]http://t.hotimg.com/ts/8XUzURZ.png[/img][/url]

My idea about the above SCH:
I think U2A(upper section) is generating a non-DC signal and feeding it to the JL(Lead/Probe) and the lower part is converting the AC to DC with suitable amplification.

So I rearranged the SCH as follow:
[url=http://www.hotimg.com/direct/yTdKMs2.png][img]http://t.hotimg.com/ts/yTdKMs2.png[/img][/url]

Now what do you think about this circuit?
Please share your ideas with me, I know the analog men will solve this. :)

Very thanks in advance.

[embalaskala]

Hey I'm new here at www.electronic-circuits-diagrams.com[url=http://www.carpet-cleaning-lasvegas.com].[/url] I only wanted to say greetings to all.

[mhsn]

[quote="embalaskala"]Hey I'm new here at www.electronic-circuits-diagrams.com[url=http://www.carpet-cleaning-lasvegas.com].[/url] I only wanted to say greetings to all.[/quote]Me too! Thanks anyway