Seismic sensor station
A seismic sensor station employs a sensor unit that is mounted on a central mounting post attached to the base of a sensor station housing. The only path of mechanically supporting contact that exists between the sensor unit and the base is through the central mounting post.
1. A seismic sensor station comprising a housing comprising:
a base and a removable lid, which when assembled together form a shell whereby the base and the removable lid both have a shell side and an exterior side;
a central mounting post attached to the base and protruding into the shell side of the base;
a sensor unit mounted on the central mounting post, whereby no other mechanically supporting contact exists between the sensor unit and the base other than via the central mounting post,
wherein the sensor unit comprises:
a central sensor plate mounted transversely on the central mounting post;
optical sensor fibers disposed on the central sensor plate; and
two sensor weights whereby a first of the two sensor weights is mechanically supported on the central sensor plate on a lid facing side of the central sensor plate and a second of the two is mechanically supported on the central sensor plate on a base facing side.
2. The seismic sensor station of claim 1 , wherein the central mounting post consists of an insert piece inserted into a through-hole provided in the base, and wherein the insert piece is provided with a shell-side receptacle to engage with a mounting screw on the shell side of the base and an exterior-side receptacle to engage with a sensor spike.
3. The seismic sensor station of claim 1 , further comprising:
a sensor spike attached to the central mounting post on the exterior side of the base, and protruding outward from the shell.
4. The seismic sensor station of claim 1 , wherein the sensor unit is mounted on the central mounting post by means of one single mounting screw.
5. The seismic sensor station of claim 1 , wherein the sensor unit comprises a center of mass, and wherein there is a point of contact between the central mounting post and the sensor unit in the center of mass of the sensor unit.
6. The seismic sensor station of claim 5 , wherein the point of contact is uniquely in the center of mass.
7. The seismic sensor station of claim 1 , wherein the sensor unit comprises a sandwich structure, wherein the first sensor weight comprises a flat first weight tablet mounted parallel to the central sensor plate with spacers between the flat first weight tablet and the central sensor plate, and wherein the second sensor weight comprises a flat second weight tablet mounted parallel to the central sensor plate with spacers between the flat second weight tablet and the central sensor plate.
8. The seismic sensor station of claim 7 , wherein the flat second weight tablet is provided with a second through-opening through which the central mounting post protrudes without having any direct point of contact between the central mounting post and the second sensor weight.
9. The seismic sensor station of claim 8 , wherein the flat first weight tablet is provided with a first through-opening vertically aligned with the second through-opening.
10. The seismic sensor station of claim 1 , wherein the housing is provided with two cable docking ports, each allowing passage of a fiber optical cable from outside to inside the shell.
11. The seismic sensor station of claim 10 , wherein the two cable docking ports are exclusively provided in the removable lid.
12. The seismic sensor station of claim 11 , wherein a fiber management tray is suspended from the removable lid on the shell side of the removable lid and wherein one or more optical fibers entering the shell via the two cable docking ports are looped on the fiber management tray, in an excess fiber storage space defined between the fiber management tray and the removable lid.
13. The seismic sensor station of claim 12 , wherein a communication opening is provided in the fiber management tray for routing one or more sensor fibers to the sensor unit whereby the sensor fibers are optically connected to the sensor unit.
14. The seismic sensor station of claim 10 , wherein each of the cable docking ports comprises an filler chamber, which filler chamber is integrally formed in the removable lid, whereby at least a first part of the fiber optical cable passes from outside of the shell into the filler chamber and whereby at least a second part of the fiber optical cable passes from the filler chamber into the shell, and wherein the filler chamber is filled with an adhesive filler surrounding the fiber optical cable.
15. The seismic sensor station of claim 1 , wherein the central mounting post comprises an insert piece inserted into a through-hole provided in the base, and wherein the insert piece is provided with a shell-side receptacle to engage with a mounting screw on the shell side of the base and an exterior-side receptacle to engage with a sensor spike.
16. A seismic sensor station comprising a housing comprising:
a base and a removable lid, which when assembled together form a shell whereby the base and the removable lid both have a shell side and an exterior side;
a central mounting post attached to the base and protruding into the shell side of the base;
a sensor unit mounted on the central mounting post, whereby no other mechanically supporting contact exists between the sensor unit and the base other than via the central mounting post,
wherein the housing is provided with two cable docking ports, each allowing passage of a fiber optical cable from outside to inside the shell, wherein the two cable docking ports are exclusively provided in the removable lid,
wherein a fiber management tray is suspended from the removable lid on the shell side of the removable lid and wherein one or more optical fibers entering the shell via the two cable docking ports are looped on the fiber management tray, in an excess fiber storage space defined between the fiber management tray and the removable lid.
17. The seismic sensor station of claim 16 , wherein a communication opening is provided in the fiber management tray for routing one or more sensor fibers to the sensor unit whereby the sensor fibers are optically connected to the sensor unit.
18. The seismic sensor station of claim 16 , wherein each of the cable docking ports comprises an filler chamber, which filler chamber is integrally formed in the removable lid, whereby at least a first part of the fiber optical cable passes from outside of the shell into the filler chamber and whereby at least a second part of the fiber optical cable passes from the filler chamber into the shell, and wherein the filler chamber is filled with an adhesive filler surrounding the fiber optical cable.
19. A seismic sensor station comprising a housing comprising:
a base and a removable lid, which when assembled together form a shell whereby the base and the removable lid both have a shell side and an exterior side;
a central mounting post attached to the base and protruding into the shell side of the base;
a sensor unit mounted on the central mounting post, whereby no other mechanically supporting contact exists between the sensor unit and the base other than via the central mounting post,
wherein the housing is provided with two cable docking ports, each allowing passage of a fiber optical cable from outside to inside the shell, wherein each of the cable docking ports comprises an filler chamber, which filler chamber is integrally formed in the removable lid, whereby at least a first part of the fiber optical cable passes from outside of the shell into the filler chamber and whereby at least a second part of the fiber optical cable passes from the filler chamber into the shell, and wherein the filler chamber is filled with an adhesive filler surrounding the fiber optical cable.
20. The seismic sensor station of claim 19 , further comprising:
a sensor spike attached to the central mounting post on the exterior side of the base, and protruding outward from the shell.