Acceleration measuring device

A device for measuring acceleration comprising:

• a sealed tube containing a gas;
• a cold cathode located within the sealed tube;
• and
• an anode located within the sealed tube and directly facing said cold cathode on a substantially same plane, said anode being separated from said cold cathode by an inter-electrode space through which an anode current flows;
• wherein the density of the gas in said inter-electrode space varies as a function of acceleration experienced by the sealed tube, whereby acceleration is measured by means of the magnitude of the anode current varying as a function of acceleration experienced by the sealed tube when a constant voltage is applied between the cold cathode and the anode.

An apparatus for measuring acceleration in three dimensions, comprising:

• a first acceleration-measuring unit comprising a first sealed tube containing a gas, a first cold cathode and a first anode located within the first sealed tube and directly facing each other on a first plane, said first anode being separated from said first cold cathode by a first inter-electrode space through which a first anode current flows;
• and
• a second acceleration-measuring unit comprising a second sealed tube containing a gas, a second cold cathode and a second anode located within the second sealed tube and directly facing each other on a second plane, said second anode being separated from said second cold cathode by a second inter-electrode space through which a second anode current flows;
• wherein the density of the gas in said first inter-electrode space varies as a function of acceleration experienced by the first sealed tube, whereby acceleration is measured by means of the magnitude of the first anode current varying as a function of acceleration experienced by the first sealed tube when a constant voltage is applied between the first cold cathode and the first anode, and
• wherein the density of the gas in said second inter-electrode space varies as a function of acceleration experienced by the second sealed tube, whereby acceleration is measured by means of the magnitude of the second anode current varying as a function of acceleration experienced by the second sealed tube when a constant voltage is applied between the second cold cathode and the second anode.