CALIBRATION METHOD AND DEVICE

• US 20120265469A1
• Filed: 06/10/2011
• Published: 10/18/2012
• Est. Priority Date: 04/15/2011
• Status: Abandoned Application

• Current Assignee: Askey Computer Corporation (ASUSTek Computer, Inc.)
• Original Assignee: Askey Computer Corporation (ASUSTek Computer, Inc.)
• Inventors: HSIEH, CHING-FENG, YANG, SHENG-HUEI
• Application Number:
  US13/157,437
• Publication Number:
  US 20120265469A1
• Time in Patent Office: Days
• US Class Current: 702/85
• CPC Class Codes: G01D 18/008 with calibration coefficients stored in memory

Abstract

A calibration method and device calibrate a signal to be calibrated and measured. The signal to be calibrated and measured is outputted by a linear measurement system in a test stage. The method includes inputting a default input signal to the linear measurement system to obtain a default measurement signal; determining a linear strength between the default measurement signal and the default input signal; obtaining a calibration formula according to linear retrogression to calibrate the signal to be calibrated and measured, thereby obtaining a calibrated value and effectuating precise linear measurement.

Claims

1. A device for calibrating a measurement signal outputted by a linear measurement system receiving an input signal, the device comprising:

a measurement signal input unit connected to the linear measurement system for receiving the measurement signal;

a default input signal input unit for receiving the input signal; and

a control unit connected to the measurement signal input unit and the default input signal input unit, the control unit adapted to determine a linear strength between the input signal and the measurement signal to obtain a equation of the line for a calibration formula and to calibrate the measurement signal based on the calibration formula.

2. The device of claim 1, wherein the input signal is at least one of a voltage source and a current source.

3. The device of claim 2, wherein the control unit further comprises at least one of a memory unit for storing the calibration formula and a display unit for displaying a value of the linear strength.

4. The device of claim 1 wherein the measurement signal is at least one of a calibrating measurement signal and a default measurement signal, and the input signal is at least one of a testing input signal and a default measurement signal.

5. A method for calibrating a calibrating measurement signal outputted by a linear measurement system receiving a testing input signal, the method comprising the steps of:

outputting a default measurement signal from the linear measurement system based on receiving a default input signal;

determining a linear strength between the default measurement signal and the default input signal;

creating a equation of the line for a calibration formula by selective application of a linear retrogression from the default measurement signal and the default input signal based on the linear strength; and

substituting the signal detected by the linear measurement system and intended to be calibrated and measured into the calibration formula so as to perform calibration.

6. The method of claim 5, wherein the step of selective application of linear retrogression further comprises:

creating the equation of the line whenever the normalized linear strength is larger than or equal to 0.95 but less than 1, or is larger than or equal to −

0.95 but less than −

1; and

not creating the equation of the line whenever the normalized linear strength is equal to 1 or −

1, or is less than 0.95 but larger than −

0.95.

7. The method of claim 5, wherein the discriminant of the linear strength is:

(Σ

(x−

{dot over (x)})(y−

{dot over (y)}))/(√

{square root over (Σ

(x−

{dot over (x)})²)}√

{square root over (Σ

(y−

{dot over (y)})²))}, wherein the default input signal value and the default measurement signal value are denoted by x, and y, respectively, and the averages of x and y are denoted by {dot over (x)} and {dot over (y)}, respectively.

8. The method of claim 5, wherein the linear retrogression formula is:

z=my′

+l, wherein a slope, a level, a value of the signal to be calibrated and measured, and the calibrated value are denoted by m, l, y′

, and z, respectively.

9. The method of claim 8, wherein the slope m and the level l are expressed by m=(nΣ

_i=1ⁿx_iy_i−

Σ

_i=1ⁿx_iΣ

_i=1ⁿy_i)/(nΣ

_i=1ⁿx_i²−

(Σ

_i=1ⁿx_i)²) and l={dot over (y)}−

m{dot over (x)}, respectively, wherein the default input signal value and the default measurement signal value are denoted by x and y, respectively, and the averages of x and y are denoted by {dot over (x)} and {dot over (y)}, respectively.