Modularized laser-based survey system

• US 5,859,693 A
• Filed: 08/26/1997
• Issued: 01/12/1999
• Est. Priority Date: 08/26/1997
• Status: Expired due to Term

• Current Assignee: Kama-Tech (HK) Limited
• Original Assignee: Laser Technology Incorporated (Laser Technology)
• Inventors: Dunne, Jeremy G., Zykan, Blair J.
• Primary Examiner(s): Hellner, Mark
• Application Number:
  US08/918,395
• Time in Patent Office: 504 Days
• Field of Search: 356/4.01, 356/141.2, 356/141.5, 356/147, 33/490, 33/1 CC
• US Class Current: 356/4.01
• CPC Class Codes: G01C 15/002 Active optical surveying means optical plumbing G01C15/105
• CPC Class Codes: G01S 17/10 using transmission of interrupted, pulse-modulated waves determination of distance by phase measurements G01S17/32
• CPC Class Codes: G01S 17/86 Combinations of lidar systems with systems other than lidar, radar or sonar, e.g. with direction finders
• CPC Class Codes: G01S 7/4813 Housing arrangements

Abstract

A modular laser-based surveying system is disclosed which comprises a laser-based distance measuring module and a separable compass module removably coupled to the laser based distance measuring module. Each of these modules may be operated as stand alone units as each has its own power supply and display. The system further may comprise a separate angle encoder module adapted to be coupled to either the laser distance measuring module or the compass module and a data logger or computer for processing data transmitted from any or all of the modules.

Claims

1. A modular surveying system comprising:

a laser based distance measuring module having a hollow housing containing a transmitter for transmitting laser pulses toward a target, a receiver for receiving reflected laser pulses from said target, a processor connected to said transmitter and receiver for determining from said transmitted and reflected pulses a distance to said target, a display device for viewing said distance, and a power supply connected to said transmitter, said receiver, said processor and to said display device; and

a separable compass module having a compass module housing adapted to be attached to said laser based distance measuring module, said compass module having an electronic compass sensor capable of producing an electrical output signal mounted at one end of said compass module housing, said housing containing an azimuth processor for converting said sensor output signal to an azimuth signal, and a power supply connected to said compass sensor and to said processor, and a display connected to said azimuth processor for displaying said azimuth, wherein said laser based distance measuring module is tiltable through up to a 360 degree vertical arc while said compass module remains substantially upright.

2. The system according to claim 1 wherein each of said modules further comprises a port connector for transferring azimuth and distance signals to a data storage device.

3. The system according to claim 1 further comprising an angle encoder module adapted to be connected to either said compass module or said laser based distance measuring module.

4. The system according to claim 3 wherein each of said modules further comprises a data transfer port mounted on the module housing for transferring signals to a data storage device.

5. The system according to claim 1 wherein each of said modules has an internal power supply, each of said modules being capable of operating independently of any other module.

6. A modular surveying system comprising:

a laser based distance measuring module having a hollow housing containing a transmitter for transmitting laser pulses toward a target, a receiver for receiving reflected laser pulses from said target, a processor connected to said transmitter and receiver for determining from said transmitted and reflected pulses a distance to said target, an inclinometer for sensing a tilt angle between said module and a horizontal plane, a display device for viewing said distance, and a power supply connected to said transmitter, said receiver, said processor and to said display device; and

a separable compass module having a compass module housing adapted to be attached to said laser based distance measuring module, said compass module having an electronic compass sensor capable of producing an electrical output signal mounted at one end of said compass module housing, said housing containing an azimuth processor for converting said sensor output signal to an azimuth signal, and a power supply at an opposite end of said housing connected to said compass sensor and to said processor, and a display connected to said azimuth processor for displaying said azimuth, wherein said laser based distance measuring module is tiltable through up to a 360 degree vertical arc while said compass module remains substantially upright.

7. The system according to claim 6 wherein each of said modules further comprises a port connector for transferring azimuth and distance signals to a data storage device.

8. The system according to claim 6 further comprising an angle encoder module adapted to be connected to either said compass module or said laser based distance measuring module.

9. The system according to claim 8 wherein each of said modules further comprises a data transfer port mounted on the module housing for transferring signals to a data storage device.

10. The system according to claim 6 wherein each of said modules has an internal power supply, each of said modules being capable of operating independently of any other module.

11. A compass module for a modular surveying system comprising a plurality of separable modules, said compass module comprising:

an elongated hollow housing having a central longitudinal axis;

an electronic compass sensor mounted at one end of said hollow housing, said sensor producing a signal proportional to an orientation of said sensor in the earth'"'"'s magnetic field;

a signal processor carried within said housing connected to said sensor for determining an azimuth value from said signal;

a display device mounted to said housing and connected to said signal processor for displaying said azimuth value;

a power supply at an end of said housing opposite to said compass sensor connected to said sensor, said display device and to said processor; and

a control keypad fastened to said housing connected to said processor for entering user commands to said processor.

12. The compass module according to claim 11 further comprising an output port on said housing connected to said processor for transferring azimuth data from said processor to an external connection.

13. The compass module according to claim 11 wherein said compass sensor is a flux gate compass.

14. A modular surveying system comprising:

a laser based distance measuring module connected to a compass module and to a data logger, said laser based distance module including a laser pulse transmitter and a laser pulse receiver for receiving reflected laser pulses, a processor connected to said transmitter and receiver for determining from said transmitted and reflected pulses a distance to said target, a display device for viewing said distance, and a laser module power supply connected to said transmitter, said receiver, said processor and to said display device; and

a separate compass module connected to said laser based distance measuring module, said compass module having a hollow compass module housing adapted to be attached to said laser based distance measuring module, said housing supporting an electronic compass sensor at one end of said compass module housing, said housing containing an azimuth processor for converting a compass sensor signal to an azimuth signal, and a power supply located at an opposite end of said housing, said supply connected to said compass sensor and to said processor.

15. The system according to claim 14 further comprising a display device fastened to said compass module housing and connected to said azimuth processor for displaying said azimuth.

16. The system according to claim 14 wherein said laser based distance measuring module is tiltable through up to a 360 degree vertical arc while said compass module remains substantially upright.

17. The system according to claim 16 wherein said laser based distance measuring module includes a tilt sensor measuring tilt of said module from a horizontal plane.

18. A modular surveying system comprising:

a laser based distance measuring module having a housing containing a transmitter for transmitting laser pulses toward a target, a receiver for receiving reflected laser pulses from said target, a processor connected to said transmitter and receiver for determining from said transmitted and reflected pulses a distance to said target, an inclinometer for sensing a tilt angle between said module and a horizontal plane, a display device for viewing said distance, and a power supply connected to said transmitter, said receiver, said processor and to said display device; and

a compass module connected to said laser based measuring module, said compass module comprising;

an elongated hollow housing having a central longitudinal axis;

an electronic compass sensor mounted at one end of said hollow housing, said sensor producing a signal proportional to an orientation of said sensor in the earth'"'"'s magnetic field;

a signal processor carried within said housing connected to said sensor for determining an azimuth value from said signal;

a display device mounted to said housing and connected to said signal processor for displaying said azimuth value;

a power supply at an end of said housing opposite to said compass sensor connected to said sensor, said display device and to said processor; and

a control keypad fastened to said compass module housing connected to said processor for entering user commands to said processor.

19. The system according to claim 18 further comprising an output port on said housing connected to said processor for transferring azimuth data from said processor to an external connection.

20. The system according to claim 18 wherein said compass sensor is a flux gate compass.

21. The system according to claim 18 further comprising an adjustable joint assembly between said modules fastening said compass module to said laser based distance measuring module, said assembly rigidly supporting the modules in a spaced relation in two dimensions.

22. The system according to claim 18 wherein said joint assembly is interchangeable between right and left sides of said laser based distance measuring module.

23. The system according to claim 21 wherein said joint assembly permits relative movement between said modules in a third dimension.

24. The system according to claim 23 wherein said joint assembly permits relative rotational movement between said modules about said joint assembly.

25. The system according to claim 18 further comprising an angle encoder module and a data storage device, wherein the angle encoder module is attached to said laser based distance measuring module and connected to said compass module and at least one of said modules is electrically connected to said data storage device so that data generated by any one of said modules can be transferred to and stored in said data storage device.