Abstract: The invention discloses an embedded system for dexterous hand, comprising: a central communication unit, several fingers, a palm; wherein the central communication unit communicates with the fingers, the palm and a host computer, and is configured to receive an operation instruction from the host computer, and convert the operation instruction into a control instruction and send it to the fingers and the palm; the fingers and the palm are designed to be compatible in hardware structure, and are connected by serial communication; the fingers and the palm move according to the control instructions. The fingers and palm are designed as embedded compatibility standards, which makes the dexterous hand more flexible and easy to maintain and use with lower cost. Thus, the dexterous hand has the advantages of high flexibility, high reliability, strong anti-interference, low cost, high transmission speed, convenient maintenance, and good user experience.

Abstract: An anti-masking device for an intrusion detector and method for detecting a masking substance is disclosed. The device can comprise a cover enclosing an interior area housing an electric light source and a light detecting sensor. The cover can have a light-permeable area having an exterior surface with a jagged array including a plurality of parallel spaced-apart teeth forming a series of alternating channels and projections. A light guide can be provided with opposing first and second ends. The first end can be located within the interior area adjacent the light source and the second end can be located adjacent the exterior surface of the cover. The light guide can be configured to direct light outside the cover and onto the jagged array. The jagged area can be configured to refract light from the light guide through the cover and into the interior.