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Mon Dec 17 22:13:03 2018, anchal, DailyProgress, TempCtrl, Proposed circuit for cavity temperature sensor Part 2

Message ID: 2265 Entry time: Mon Dec 17 22:13:03 2018 Reply to this: 2266

Author:	anchal
Type:	DailyProgress
Category:	TempCtrl
Subject:	Proposed circuit for cavity temperature sensor Part 2

The second stage of the amplifier for temperature sensor would be subtractor circuits using OP27G.

PFA the circuit schematic consisting of the instrumentation amplifier and different circuits for acromag channels.
There would be 1 low-resolution channel with a range from about 15 $^\circ C$ to 95 $^\circ C$ with a response: 0.238053435115*T - 13.167938931297705
Rest would high-resolution channels with a smaller range. These channels would give us about 1mV/mK slope so that we can read with mK precision with 16 bit $\pm 10$ V range.
Channel 1: From 15 $^\circ C$ to 35 $^\circ C$ with a response: 0.952875*T - 22.5
Channel 2: From 35 $^\circ C$ to 55 $^\circ C$ with a response: 0.943758551683*T - 43.329447115384596
Channel 3: From 55 $^\circ C$ to 75 $^\circ C$ with a response: 0.955040625*T - 61.9375
Channel 4: From 75 $^\circ C$ to 95 $^\circ C$ with a response: 0.9429496875*T - 79.74466991341995

I'm attaching calculations done in the jupyter notebook as zip file.

Wed Dec 19 17:13:14 2018

There is an error in this schematic. This is not the final schematic.

Refer this only for the calculations. Use the updated schematic at DCC.

Attachment 1:

Attachment 2:

CavTempSensorAcromagChannels.pdf 387 kB Uploaded Wed Dec 19 17:18:54 2018 | Hide | Hide all