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DetectionPrincipleTwo-sidedTelecentricOpticalSystemPrinciple(ABSST1300,ABSAT1300)Linearencoderequippedwithtwo-sidedtelecentricopticalsystemimagingLight-receivingdeviceZXYLight-receivingdeviceLightsource+Two-sidedtelecentricopticalsystemScaleDeepfocaldepthTwo-sidedtelecentricopticalsystemZXScaleDetectionPrinciple•Thescalegratingiscapturedasanimagewiththetwo-sidedtelecentricopticalsystemanditsdisplacementisdetectedwithalight-receivingdevice.WideimagingrangeFeatures•Adoptionofatwo-sidedtelecentricimagingopticalsystem⇒Improvestherobustnessoftheencoder.•Thedeepfocaldepth⇒ExtendsallowanceforGAPvariation(scalewavinessandstageorientationvariation,detectormountingvariation,etc.).•Thewideimagingrange⇒Extendsallowanceforcontamination,slightdamage,etc.onthescale.7-61
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