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Barometric altimeter with a temperature compensating device

A barometric altimeter, altimeter technology, applied in the field of altimeter, can solve the problems of large storage capacity, not intuitive, expensive, etc., and achieve the effect of easy realization

Active Publication Date: 2010-12-15
ETA SA MFG HORLOGERE SUISSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] This solution thus has the disadvantage of being less intuitive, which is detrimental to altimeter ergonomics
[0011] Furthermore, this solution requires a large storage capacity, which makes it relatively expensive

Method used

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Examples

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Embodiment Construction

[0035] figure 1 A portable barometric altimeter 10 is shown, made in accordance with the teachings of the present invention.

[0036] Preferably, the altimeter 10 is placed as figure 2 The electronic watch shown in 12. It comprises a pressure sensor 14 connected to a calculation unit 16 for the pressure P measured by the sensor 14 and for the reference temperature T 0 An altitude value is determined, wherein the reference temperature corresponds to an estimate of the temperature of the air mass at sea level. The calculation unit 16 implements the formula (1) defined above for calculating the height H.

[0037] The watch 12 also comprises a time-measuring unit 18 for providing time h and calendar information, here a date D, and display means 20 here constituted by hands 22 and two liquid crystal screens 24 .

[0038] In the example shown, the time h is displayed analogously by means of the pointer 22 , while the date D and the altitude H are displayed digitally by means of...

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PUM

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Abstract

The present invention proposes a portable barometric altimeter ( 10 ) including a pressure sensor ( 14 ), a calculation unit ( 16 ) which determines an altitude value (H) as a function of the pressure (P) measured by the sensor ( 14 ) and as a function of a reference temperature (T0) corresponding to an estimate of the temperature of the air mass at sea level, and a time measuring unit ( 18 ) that supplies calendar data (D), characterized in that it includes a correction circuit ( 32 ), which selects the reference temperature value (T0) from among a series of values (TS) contained in a database stored in the altimeter ( 10 ), as a function of the date (D) and as a function of a predefined climate value (C). The invention also proposes a method of determining altitude (H).

Description

technical field [0001] The invention relates to a portable barometric altimeter and a method for determining altitude for said altimeter. [0002] More precisely, the barometric altimeter according to the invention comprises: a pressure sensor; a calculation unit that determines an altitude value from the pressure measured by said sensor and from a reference temperature corresponding to an estimate of the air mass temperature at sea level; and provides a calendar The unit of time measurement for the data. [0003] The invention relates in particular to an altimeter of this type arranged in an electronic watch. Background technique [0004] In this type of altimeter, to obtain the altitude, the calculation unit implements a formula defined by an international standard expressing the relationship between altitude, atmospheric pressure and temperature. The formula is as follows: [0005] H=153.85*T 0 * 1-(P / P 0 ) 0.190255 (1) [0006] In this formula, T 0 is the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C5/06G01L7/10G04G99/00G04G21/02
CPCG04G21/02G01C5/06
Inventor G·萨珀里托C·格尔米奎特S·克劳德
Owner ETA SA MFG HORLOGERE SUISSE
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