Describe FilterCavity/Electronics here.

SERVOFILTER Module

This NIM module is a servo module intended to control the following devices: SHG, GRMC (Green mode cleaner), MZ (Mach-Zender),OPO, IRMC (IR mode cleaner) and 2 CC (Coherent Control).

It includes the following stages and features:

  1. Input stage (inverting/ non inverting control on front panel): ERROR IN
  2. 1 input (PERTURB IN) and 2 outputs (EPS1 and EPS2) for transfer function (TF = EPS1/EPS2)
  3. Offset control (potentiometer on front panel)
  4. Variable gain (potentiometer on front panel): VARIABLE GAIN OUTPUT
  5. 1/f integrator and 1/f2 double integrators (switchable on front panel: 1/f or 1/f3)
  6. Differentiator (switchable on front panel)
  7. Low-pass filter (switchable on board)
  8. Notch filter 1 (switchable on board)
  9. Notch filter 2 (switchable on board)
  10. 1 TEST IN input and 1 TEST OUT output on front panel for testing differentiator, low-pass filter and notch filter (in SCAN mode).
  11. Output stage between 0V and 10V. Centered on 5V in SCAN mode: SERVO OUT
  12. Logic control:
    1. SCAN or LOCK mode switchable on front panel
    2. AUTO or MANUAL locking mode switchable on front panel. Switch ON /OFF for manual mode
    3. Logic Reset button (RAZ) and red LED on front panel
    4. Input for transmission signal for automatic lock. Can be inverted or not by a strap on board.
    5. ENABLE IN and ENABLE OUT on front panel in order to chain Servo-filter modules
    6. Locked monitoring TTL output and green LED on front panel
    7. Selection of the locking front of error signal (+ or -) on front panel
    8. remote control (ON /OFF) switch and remote DB9 connector for the following control: 1/f or 1/f3 ; INV or NON INV ; ON or OFF lock (active only for manual mode) ; Differentiator ON or OFF

The board is supplied with 2 NIM standard supplies: +12V and -12V.

The logic part is supplied by a 5V supply derived from the +12V supply.

The following files are attached:

  1. Electronic schematics:

    ELECTRONIC-SCHEMATICS.pdf

  2. Bill of material:

    BILL-OF-MATERIAL.pdf BOM.xls

  3. Definition file (detailed documentation):

    SERVOFILTER-DEFINITION-V1.pdf

  4. Cabling plan of the electronic board:

    ELECTRONIC-BOARD-LAYOUT-PLAN.pdf

  5. Cabling plan of the front panel:

    FRONT-PANEL-PLAN.xls

Transfer Function calculation of the servo-filters modules (April 2019)

The transfer functions of the following 7 control loops were calculated with Matlab:

  1. SHG
  2. Green Mode Cleaner (GRMC)
  3. Mac-Zender (MZ)
  4. IR Mode Cleaner (IRMC)
  5. OPO
  6. Coherent Control of Green Phase (CC-1)
  7. Coherent Control of IR Phase (CC-2)

Attached is an archive file with Matlab scripts and data files used for these 7 servo-filters transfer functions calculations:

Modifications of the 7 servo-filters modules (April 2019)

The 7 servo-filters modules were modified according to the previous transfer function calculations.

Attached is an archive file with the 7 modifications files of the 7 servo-filters:

FilterCavity/Electronics (last edited 2019-04-18 08:47:18 by PierrePrat)