The Drill String Acceleration tool (DSA) has been developed at Lamont, for use during initial phases of the Active Heave Compensator Project. The primary purpose of the DSA tool is to measure and record the drillbit acceleration and vibration signals while drilling. The DSA tool contains a single axis high sensitivity accelerometer for heave measurements, a three-axial high frequency accelerometer for drillbit vibrations and a high resolution pressure sensor. For ease of deployment, the DSA has been designed as a removeable extension of the APC/XCB/RCB core barrels. Using standard threaded connections, the DSA will be attached to the top of a selected core barrel by a Core Tech prior to core barrel deployment. Except for the connection and disconnection of the DSA, coring activities will not be affected by the presence of the DSA. Upon DSA/core barrel retrieval, the DSA will be disconnected and the data downloaded to the third party data acquisition system in the DHML for immediate analysis. Below are a sample of images taken during the development and assembly.
	Assembly of electronics chassis.
	Controlled testing of accelerometer response.
	Encapsulating electronics for shock dampening.