Temperature compensated optical measuring instruments

Details Temperature compensated optical measuring instruments Temperature compensated optical measuring instruments

1976-06-25

1978-02-14

Goldstein, Herbert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

23230R, 356130, G01K 1900

Patent

active

040731820

ABSTRACT:
To reduce errors in a measuring instrument caused by temperature effects from changes in the flow rate of fluids passing through the instrument, the flow of heat is adjusted to balance the flow-rate-dependent temperature increases against the flow-rate-dependent temperature decreases that occur with the same change in flow rate in each flow path. Some of the techniques for adjusting the flow of heat are: (1) controlling the temperature of the fluid at the inlet of the instrument with one heat exchanger and the temperature of the body of the instrument with another heat exchanger; (2) controlling the temperature of the walls of the instrument with a heating coil; and (3) emitting heat within the flow path from a transducer. A typical measuring instrument in which such errors are reduced is a refractometer used to measure characteristics of a fluid flowing through a column.

REFERENCES:
patent: 3535918 (1970-10-01), Munk
patent: 3539263 (1970-11-01), Waters
patent: 3967492 (1976-07-01), Allington

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