Precipitation measuring system

• US 6,038,920 A
• Filed: 06/26/1998
• Issued: 03/21/2000
• Est. Priority Date: 06/27/1997
• Status: Expired due to Fees

• Current Assignee: Meteoglobe Canada Incorporated
• Original Assignee: Meteoglobe Canada Incorporated
• Inventors: Gilbert, Richard, Bourgeois, Stephane, Sauvageau, Mario A.
• Primary Examiner(s): OEN, WILLIAM L
• Application Number:
  US09/105,157
• Time in Patent Office: 634 Days
• Field of Search: 73/170.16, 73/170.17, 73/170.18, 73/170.19, 73/170.21, 73/170.22, 73/170.23, 73/862.625, 73/862.627, 73/862.632 , 73/862.634
• US Class Current: 73/170.23
• CPC Class Codes: G01G 17/04 for weighing fluids, e.g. gases, pastes
• CPC Class Codes: G01G 19/00 Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups electric measuring arrangements involving comparison with a reference value G01R17/00
• CPC Class Codes: G01W 1/14 Rainfall or precipitation gauges measuring volume in general G01F

Abstract

The precipitation measuring system is used for electronically measuring the amounts of rain, snow, hail or the like, with the use of a load cell. The system comprises a second frame mounted within a first frame. The second frame bears the collector and a load cell connects the second frame to the first frame. The load cell comprises a strain gauge bridge which is used to convert strain variations in the load cell into electrical conditions altering an electric current. These electrical variations correspond to weight variations occurring when the amount of precipitations in the collector varies and are then recorded by a recording device such as a computer. One advantage of the present invention is that the static and dynamic friction are eliminated, which greatly improves the precision and reliability of the system over the ones presently in operation. The calibration procedures are also simplified.

Claims

1. A precipitation measuring system comprising:

a first frame;

a load cell located within the first frame and having an upper end connected under an upper portion of the first frame, the load cell comprising at least one strain gauge bridge disposed thereon in a strain sensitive region to convert strain variations in the load cell into electrical variations;

a means for applying a potential to the strain gauge bridge;

a second frame connected under the load cell;

a precipitation collector connected over the second frame;

a counterweight connected to a lower portion of one among the collector and the second frame to maintain equilibrium thereof; and

recording means for recording the electrical variations produced by the strain gauge bridge.

2. A precipitation measuring system according to claim 1, wherein the load cell is S-shaped.

3. A precipitation measuring system according to claim 2, further comprising swivel means connected between the load cell and the second frame.

4. A precipitation measuring system according to claim 3, wherein the swivel means comprises a pair of swivels located at substantially right angle with respect to each other.

5. A precipitation measuring system according to claim 4, further comprising a spring connected between the swivels.

6. A precipitation collector according to claim 5, further comprising a spring connected between the load cell and the second frame.

7. A precipitation measuring system according to claim 1, wherein the first frame comprises a lower portion topped by four upright and spaced-apart rods, each rod having an upper end that is joined to all others by an X-shaped linking element.

8. A precipitation measuring system according to claim 7, wherein the second frame comprises four upright and spaced-apart rods, each rod of the second frame having a lower end connected to a lower support plate and an upper end connected to an upper support plate, the lower support plate being embedded within the first frame.

9. A precipitation measuring system according to claim 1, further comprising a damper connected to the counterweight to damp oscillations of the same.

10. A precipitation measuring system according to claim 9, wherein the damper comprises a damping element immersed in a non-freezing liquid bath.

11. A precipitation measuring system according to claim 1, further comprising data transmitting means for transmitting data recorded by the recording means to another location via an electronic communication medium.

12. A precipitation measuring system according to claim 1, further comprising a wind deflector enclosing the collector.

13. A precipitation measuring system according to claim 12, wherein the wind collector is a Nipher type wind collector.