Differences between revisions 34 and 35

Optical Levers

Related subgroups: VIS, IOO, MIF, VAC, CRY...

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Contents

Optical Levers

Scope

The scope of optical levers is to sense local angular motions (pitch and yaw) of any mirrors supported by vibration isolation system and other suspended stuffs including suspeded optical benches.

Applicable Documents

TBD; just see the links below.

General Description

Naming Conventions

Locations

BS chamber
ITM chambers (X,Y)
ETM chambers (X,Y)
PRC chambers (PRC, PR2, PR3)
SRC chambers (SRC, SR2, SR3)
MC chambers (MC1, MC2...)

Requirements

Sensor noise should be less than xxx.
Sensor's dynamic range should be greater than xxx.
At least horizontal degrees of freedom (X,Y)
Preferably a vertical sensor (Z) and side
The sensors have to be rigidly mounted on the ground so that these are useful for remembering the position of the mirror and recording the drifts.

Characteristics

Each optical lever consists of an optical system, a frontend circuit, and a human interface software.
The optical system consists of the following parts: a light source, optical fibers, a focusing telescope, viewport windows, a detector, and pylons which support the focusing telescope and the detector.

The frontend circuit is TBD. Maybe we need analog cables (and what kind of connector should we use?), whitening filters and antialiasing filters. Maybe the matrix circuit will be realized using the digital systems, but in commissioning phase, we will need analog matrix.

The human interface software is TBD, which shows the mirrors' dofs monitored by Optical Levers.

Light source

For the light source, proposed candidates are
- superluminous LED (SLED) or
- laser light source as LIGO.

Optical Fibers

The optical fibers transmit the light from the source to the focusing telescope.

Focusing Telescopes

TBD. Moving linear stage with micrometer and some optical components like collimators?

Viewport windows

See also the viewport subsystem.
It should be transparent for the light source wavelength.
There should be no wedge; otherwise the multiple spots of light would be problematic.
See JGW-T1201231, Effect due to viewports for optical lever (in Japanese)

Detectors

The detector will be an ordinary quadruplet photocondutive circuit with QPD. The noise level at xxx Hz should be xxx m/Hz²

Pylons

The pylons must be designed.

Inspection plans

Procurement process and plans

Action Items

A/I化できたもの、されたもののリスト

AI_MIF_INVACPD#	Identified on	Assigned to	Status	Description
001 仕様の確認	20120925	Akutsu	Closed（20121001）	設計上のdetailをLIGOに確認。どこで真空シールしてるのか？など。20121001にやりとりしたメール参照。
002 プロトタイプ製作手段の確保	20120925	Akutsu	Closed（20121107）	NAOJ-ATC/MEかどこかにプロトタイプ製作をかけあう。予算はKAGRAから（？）。→ATCは多忙そうなので某社に相談。新しいAI005へ派生。
003 プロトタイプ図面作成の指示、レビュー	20120925	Akutsu		回路上のPDの位置やレギュレータ、コネクタの位置によって外箱にあける穴の位置がかわるように見えるので、そのdetailを反映したプロトタイプ図面を、製作してもらうところにつくってもらう→みんなでレビュー
004 プロトタイプ発注作業	20120925	Akutsu		プロトタイプの発注作業
005 コネクタ型番	20121107	Akutsu	進行中。	（AI002より派生）某社より、天井コネクタ2種の型番確認依頼。LIGOを通じて問い合わせ中。場合によっては社外秘かなにかで明らかにされれない可能性もあり。

-  ⇤ ← Revision 34 as of 2012-09-16 20:42:10 → 
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  Editor: KiwamuIzumi
  Comment:
+   ← Revision 35 as of 2012-11-12 19:57:36 → ⇥
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  Editor: TomotadaAkutsu
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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+== Action Items ==
A/I化できたもの、されたもののリスト
|| '''AI_MIF_INVACPD#''' || '''Identified on'''|| '''Assigned to '''||'''Status'''|| '''Description''' ||
|| 001 仕様の確認||20120925||Akutsu|| Closed（20121001）||設計上のdetailをLIGOに確認。どこで真空シールしてるのか？など。20121001にやりとりしたメール参照。||
|| 002 プロトタイプ製作手段の確保||20120925||Akutsu|| Closed（20121107）||NAOJ-ATC/MEかどこかにプロトタイプ製作をかけあう。予算はKAGRAから（？）。→ATCは多忙そうなので某社に相談。新しいAI005へ派生。||
|| 003 プロトタイプ図面作成の指示、レビュー||20120925||Akutsu|| || 回路上のPDの位置やレギュレータ、コネクタの位置によって外箱にあける穴の位置がかわるように見えるので、そのdetailを反映したプロトタイプ図面を、製作してもらうところにつくってもらう→みんなでレビュー||
||004 プロトタイプ発注作業||20120925 ||Akutsu|| || プロトタイプの発注作業||
||005 コネクタ型番||20121107 ||Akutsu||進行中。|| （AI002より派生）某社より、天井コネクタ2種の型番確認依頼。LIGOを通じて問い合わせ中。場合によっては社外秘かなにかで明らかにされれない可能性もあり。||