Method of increasing the measuring resolution of a flow measuring instrument where the flow is divided into sections of well defined volume |
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| 申请号 | US24746172 | 申请日 | 1972-04-25 | 公开(公告)号 | US3815414A | 公开(公告)日 | 1974-06-11 |
| 申请人 | HELLSTROM K; | 发明人 | HELLSTROM K; | ||||
| 摘要 | The resolution of a device, which measures the flow of liquid in a tube by producing a series of signals each of which corresponds to the passage through the tube of a predetermined volume of liquid, is increased by the introduction of additional signals at a rate which is a predetermined multiple of the basic signals and utilizing these additional signals, coordinated with the basic signals, to indicate the passage through the tube of fractional amounts of the volume measured by each of the basic signals. | ||||||
| 权利要求 | 1. In a liquid flow measuring system of the type wherein liquid flows through a conduit in increments of predetermined volume and wherein a flow control device is responsive to a control signal to vary the rate of flow of said increments of volume through a flow measuring instrument placed in series with said flow control device, said flow measuring instrument generating indicating signal pulses corresponding to the passage of said increments of volume through said measuring device, the method for increasing the measuring resolution of said flow measuring instrument which comprises the steps of connecting said flow measuring instrument in a circuit which includes first and second pulse counting circuits and an interfacing circuit, generating pulses with said interfacing circuit in response to said control signal at a frequency greater than the frequency of pulses generated by said flow measuring instrument and at a constant ratio with respect to the pulses generated by said flow measuring instrument, connecting said first pulse counting circuit to be responsive only to pulses generated by said flow measuring instrument, said second pulse counting circuit to be responsive to pulses generated by said flow measuring instrument and said interfacing circuit, and utilizing pulses counted by said first and second pulse counting circuits to represent the flow respectively of whole and fractional increments of said predetermined volume through said flow measuring instrument. 2. The method of claim 1 which includes the steps of repetitively counting the number of pulses generated by the interfacing circuit between successive pulses generated by the flow measuring instrument, and initiating each said repetitive counting concurrently with the generation of a pulse by the flow measuring instrument. 3. The method of claim 2 which includes the step of adjusting the frequency of the pulses generated by the interfacing circuit in proportion to changes in the fRequency of pulses generated by the flow measuring instrument, whereby the representation of the flow of fractional amounts of said predetermined volume through said flow measuring instrument will be unaffected by changes in the rate of said flow. |
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