초록 ▼

The specific gravity, l, of a fluid of interest is determined based on thermal conductivity, k, and specific heat, cp, of the fluid of interest. An embodiment uses proximately positioned resistive heater and thermal sensor elements coupled by the fluid of interest. Pulses of electrical energy are ap

The specific gravity, l, of a fluid of interest is determined based on thermal conductivity, k, and specific heat, cp, of the fluid of interest. An embodiment uses proximately positioned resistive heater and thermal sensor elements coupled by the fluid of interest. Pulses of electrical energy are applied to the heater of a level and duration such that both a transient change and a substantially steady-state temperature occur in the sensor. The k of the fluid of interest is determined based upon sensor output at steady-state elevated temperature, cp of the fluid of interest is determined based upon the rate of change of sensor output during a time interval of transient temperature change in the sensor, and l is determined from k and cp.

대표청구항 ▼

Apparatus for determining specific gravity, rp, of the fluid of interest based on k and the rate of change of the first output signal during a transient temperature condition; means for producing signals indicative of the values of k and cp of the fluid of interest; conversion means for converting s

Apparatus for determining specific gravity, rp, of the fluid of interest based on k and the rate of change of the first output signal during a transient temperature condition; means for producing signals indicative of the values of k and cp of the fluid of interest; conversion means for converting signals indicative of the values of k and cp of the fluid of interest to values indicative of r