Differences between revisions 23 and 36 (spanning 13 versions)

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.

Action Items

A/I化できたもの、されたもののリスト

AI_AOS_OPLEV#	Identified on	Assigned to	Status	Description
001 仕様の確認	2012xxxx	Michimura	Closed（2012xxxx）	JGW-XXXXXX 参照。一応これはこれでclosedということにしておく。
002 プロトタイプ設計、製作、テスト	2012xxxx	Agatsuma, Takahashi	進行中	A/Iの切り分けとしては少し雑だったか。
003 光学系の概念設計	20121112	Agatsuma, Takahashi		光てこの設置位置を確定すべく、まずはどのくらいの占有空間が真空槽の外側に必要かを把握するため。光てこ系の光学系概念図をつくる。部品選定が未定の部分は両方に対応できるようにしておく。（光学素子の型番や素子間の距離も記入のこと）。（光源）→（レンズ）→viewport、、、といったものでよい。
004 実装図へ落としこむ	20121112	Akutsu?		AI003の光学系概念図を、真空槽近くの置き場のスペースにあうように実装図に落としこむ（もしくは占有されるスペースをわりだす、くらいでもいいのかもしれません）これは、みんなであつまってちょっと議論が必要かもです。
005 CADへ反映	20121112	????		台座、足場ふくめてCADに反映

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.

-  ⇤ ← Revision 23 as of 2011-10-07 18:42:16 → 
  Size: 3688
  Editor: TomotadaAkutsu
  Comment:
+   ← Revision 36 as of 2012-11-12 20:01:08 → ⇥
  Size: 5457
  Editor: TomotadaAkutsu
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-= Optical Lever (Room Temperature) =
+= Optical Levers =
 Line 4:
-'''[[../|..Up]]'''
+'''[[KAGRA/Subgroups/AOS| back to AOS top]]'''
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-Sensing local motions including --(longitudinal dof and)--
all alignment dofs (pitch, yaw and roll) of any mirrors supported by vibration isolation system.

<!> Note on the operating temperature: here the system is assumed to be utilized at room temperature, not in cryogenic temperature.
+ . 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.
-Line 15:
+Line 11:
-TBD; just see the links below.
+ . TBD; just see the links below.

== Action Items ==
A/I化できたもの、されたもののリスト
|| '''AI_AOS_OPLEV#'''  || '''Identified on'''|| '''Assigned to '''||'''Status'''|| '''Description''' ||
|| 001 仕様の確認||2012xxxx||Michimura|| Closed（2012xxxx）||JGW-XXXXXX 参照。一応これはこれでclosedということにしておく。||
|| 002 プロトタイプ設計、製作、テスト||2012xxxx||Agatsuma, Takahashi|| 進行中||A/Iの切り分けとしては少し雑だったか。||
|| 003 光学系の概念設計||20121112||Agatsuma, Takahashi|| || 光てこの設置位置を確定すべく、まずはどのくらいの占有空間が真空槽の外側に必要かを把握するため。光てこ系の光学系概念図をつくる。部品選定が未定の部分は両方に対応できるようにしておく。（光学素子の型番や素子間の距離も記入のこと）。（光源）→（レンズ）→viewport、、、といったものでよい。||
||004 実装図へ落としこむ||20121112 ||Akutsu?|| || AI003の光学系概念図を、真空槽近くの置き場のスペースにあうように実装図に落としこむ（もしくは占有されるスペースをわりだす、くらいでもいいのかもしれません）これは、みんなであつまってちょっと議論が必要かもです。||
||005 CADへ反映||20121112 ||????|| || 台座、足場ふくめてCADに反映||
-Line 20:
+Line 26:
-TBD
+ . TBD
-Line 38:
+Line 44:
-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.
+ . 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.
-Line 41:
+Line 47:
-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.
+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.
-Line 47:
+Line 51:
-For the light source, proposed candidates are
 * superluminous LED (SLED) or
 * laser light source as LIGO.
+ . For the light source, proposed candidates are
  * superluminous LED (SLED) or
  * laser light source as LIGO.
-Line 52:
+Line 56:
-The optical fibers transmit the light from the source to the focusing telescope.
+ . The optical fibers transmit the light from the source to the focusing telescope.
-Line 55:
+Line 59:
-TBD. Moving linear stage with micrometer and some optical components like collimators?
+ . TBD. Moving linear stage with micrometer and some optical components like collimators?
-Line 57:
+Line 61:
-=== Viewport window ===
See also the [[../Viewport1|viewport subsystem]].
It should be transparent for the light source wavelength.
The wedge should be avoided; otherwise the multiple spots of light would be problematic.
+=== Viewport windows ===
 . See also the [[../Viewport1|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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1231|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/Hz^2^

=== Pylons ===
 . The pylons must be designed.
-Line 63:
+Line 75:
-TBD
+ . TBD
-Line 66:
+Line 78:
-TBD
+ . TBD
-Line 71:
+Line 83:
-<!> Some of the LIGO documents listed below are '''NOT''' public; to access them, you may need your own LSC account.
+ . <!> Some of the LIGO documents listed below are '''NOT''' public; to access them, you may need your own LSC account.