| 摘要 |
<p>A fluid flow measuring system utilizing semiconductor devices as heating and temperature sensitive elements produces an electrical output signal which is linearly proportional to the rate of flow of a fluid and which automatically compensates for changes in fluid density. Circuitry is provided which is responsive to the ambient temperature of the fluid to maintain the temperature of two heating and temperature sensitive elements, one coupled to the flowing fluid and another coupled to a stationary portion of the fluid, at the same constant number of degrees higher than the ambient temperature of the fluid. This results in a simplification of the mathematical relationships on which the system is based, leading to the linearization of the output signal, and also provides good sensitivity and response time regardless of large variations in the ambient temperature of the fluid.</p> |
