Downhole tool measurement device mounting system and method

Abstract

A downhole tool measurement device mounting system and method and provided.

1 . A mounting device for at least one sensor, comprising:
 a chassis;   a first sensor area and a second sensor area in the chassis capable of housing a first sensor and a second sensor that measure a characteristic along a first axis and a second axis, respectively; and   a sensor assembly mounted in a cavity of the chassis in a third sensor area wherein a sensing axis of the sensor assembly is orthogonal to the first and second axes, the sensor assembly having a block and an orthogonal sensor mounted in the block to form a monolithic assembly that is secured into the cavity.   
     
     
         2 . The mounting device of  claim 1  further comprising a first sensor housed in the first sensor area and a second sensor housed in the second sensor area. 
     
     
         3 . The mounting device of  claim 2 , wherein the first, second and orthogonal sensors are accelerometers. 
     
     
         4 . The mounting device of  claim 1  wherein the sensor assembly further comprises a retaining cap that is adjacent the orthogonal sensor and a retainer wherein the retainer secures the retainer cap and the orthogonal sensor to the block. 
     
     
         5 . The mounting device of  claim 4 , wherein the retainer is a threaded retainer that screws into the block. 
     
     
         6 . The mounting device of  1 , wherein the orthogonal sensor has a flange that is captured by the block to secure the orthogonal sensor to the block. 
     
     
         7 . The mounting device of  2  further comprising one or more circuit boards mounted on the chassis wherein at least one circuit board is mounted on a side of the chassis on which one of the first sensor, second sensor and orthogonal sensor are mounted. 
     
     
         8 . The mounting device of  1 , wherein the first sensor area and the second sensor area are each a cavity in the chassis. 
     
     
         9 . The mounting device of  2 , wherein each of the first, second and orthogonal sensors are one of a magnetometer and a gyroscope. 
     
     
         10 . The mounting device of  1 , wherein the third sensor area is located at any place along a length of the chassis. 
     
     
         11 . The mounting device of  1  further comprising a passageway underneath the cavity in the chassis in the third sensor area for a set of wires connected to the orthogonal sensor. 
     
     
         12 . The mounting device of  2 , wherein each of the first, second and orthogonal sensors are one of a magnetometer sensor and a fluxgate magnetometer sensor. 
     
     
         13 . The mounting device of  2 , wherein the fluxgate magnetometer sensor is manufactured from an amorphous material. 
     
     
         14 . The mounting device of  13 , wherein the fluxgate magnetometer sensor is manufactured from a material having a BH loop index that exceeds 0.85. 
     
     
         15 . A method for mounting one or more sensors to a chassis, the method comprising:
 mounting a first sensor and a second sensor to a chassis, wherein each sensor is capable of measuring a characteristic along a first axis and a second axis, respectively;/   mounting a third sensor assembly in a cavity of the chassis wherein a sensing axis of the third sensor assembly is orthogonal to the first and second axes; and   wherein mounting the third sensor assembly further comprises mounting a third sensor into a block to form a monolithic assembly that is mounted into the cavity of the chassis.   
     
     
         16 . The method of  claim 15 , wherein mounting a third sensor assembly further comprising inserting a retainer cap into the block after the third sensor and securing a retainer to the block to secure the retainer cap and the third sensor to the block. 
     
     
         17 . The method of  claim 15 , wherein mounting the third sensor further comprises capturing a flange of the third sensor by the block to secure the orthogonal sensor to the block. 
     
     
         18 . The method of  claim 15 , wherein mounting the third sensor assembly further comprising mounting the third sensor assembly along a length of the chassis.