US 2022/0090954 A1Published application

Calibration Method for First Time Use of Equipment

AssigneeRochester Sensors, LLC

InventorChester Roy Wildey

Life of this patent

Estimating the term…

Loading patent…

Abstract

A Time Domain Return measurement system for measuring liquid level, linear movement or other measurements which includes a first and second electrode, the second electrode spaced from the first electrode to define a gap, and an electronics assembly connected to the first and second electrodes equipped with a generator for transmitting an electromagnetic signal for propagation along the electrodes. The signal generator has a first analog timing circuit for actuating a slow-rising function of voltage versus time, a second analog timing circuit associated with the first analog timing circuit for actuating a fast-rising function of voltage versus time, and a receive circuit electrically connected to the electrodes, the receive circuit being activated for receiving return echo data associated with the electromagnetic signal transmitted when the fast-rising function is equal or greater than the slow-rising function to determine the position of the second medium with respect to the electrodes.

Claims1

Dependent claims

The method of calibrating a TDR measurement system for first use or service, comprising:

a. measuring a known material level with the TDR measurement system while at a known stable ambient temperature to obtain a measured material level;
b. comparing the measured material level to the known material level;
c. calibrate the TDR measurement system so that the measured material level is equal to the known material level;
d. measuring the apparent length at the ambient temperature of an embedded calibration trace with a known temperature-versus-length profile;
e. calculating the default length of the embedded calibration trace at a user-defined default operating temperature based on the apparent length measured at the known ambient temperature and the temperature-versus-length profile of the embedded calibration trace;
f. storing the default length for later use in measuring materials at an unknown level and varying temperatures.
The TDR measurement system as described in claim 1 with multiple impedance changes deliberately constructed on the electrode or calibration trace.

4 more elements

Facts

Application: 17/377,676Filed 16 Jul 2021
Priority: 29 Oct 2018
Published: 24 Mar 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G01F 23/284
By measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material:…
G01S 7/032
Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver: constructional details for solid-state radar subsystems
G01S 7/4052
Means for monitoring or calibrating: by simulation of echoes
G01S 7/4065
Using internally generated reference signals, e.g. via delay line, via RF or IF signal injection or via integrated reference reflector or…

Family

Application16/173,993Division · filed 29 Oct 2018
Application17/377,676Division
US 11,099,052 B2Related patent
US 11,940,314 B2Related patent
US 2020/0217706 A1Published application
US 2022/0090954 A1This patent

From the US filing history. Foreign family members aren’t listed.