Title:
ISOMERIZATION OF ALLYLHALIDE WITH ALCOHOL
Document Type and Number:
Japanese Patent JPS60130534
Kind Code:
A
Abstract:
@ Apparatus for measuring displacement comprises a member, such as a reading head, which carries a stepped index diffraction grating (14) and is movable with respect to a reflective scale grating (16). The head also carries a source (10) and lens for directing light on to the index grating and thence on to the scale grating for reflection to the index grating, with the resultant Moire bands detected by a photodetector (18) on the reading head. In order to determine the phase separation or offset, and to avoid high sensitivity thereof to the spacing between the gratings, the index grating (14) has a square-stepped profile resulting in graded, increasing thickness. Alternatively, a conventional index grating may be employed in conjunction with a stepped profile optical element interposed between the two gratings.
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Inventors:
ROISU TEII MAKUERIGATSUTO
Application Number:
JP15777184A
Publication Date:
July 12, 1985
Filing Date:
July 30, 1984
Export Citation:
Assignee:
UNION CAMP CORP
International Classes:
B01J31/00; C07B61/00; C07C21/04; C07C21/19; C07C17/00; C07C67/00; G01B11/00; G01D5/38; G02B5/18; (IPC1-7): B01J31/28; C07C17/24; C07C21/04; C07C21/19
Attorney, Agent or Firm:
Ezaki Mitsuyoshi