Parameter-embedded analog transducer calibration method

A technology that simulates sensors and pressure sensors. It is used in earth-moving drilling, measurement, wellbore/well components, etc. It can solve the problems of zero-point drift, inability to continue drilling operations, and no pressure sensors, and achieve the effect of improving work efficiency.

Inactive Publication Date: 2009-05-13
BEIJING LIUHE GREATNESS TECH
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AI Technical Summary

Problems solved by technology

If the use environment is harsh, the electronic pressure sensor cannot be calibrated online in time due to the linearity inaccuracy and zero drift caused by the long-term vibration environment, and the mechanical pressure sensor is also easily damaged by vibration.
Once damaged or inaccurate, there is no replaceable backup pressure sensor on site, and drilling operations cannot continue

Method used

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  • Parameter-embedded analog transducer calibration method
  • Parameter-embedded analog transducer calibration method
  • Parameter-embedded analog transducer calibration method

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Embodiment Construction

[0021] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] First, refer to figure 1 , the principle structure diagram of the existing pressure sensor communication method, the function of connecting a resistor R1 in series at the output end of the instrument amplifier U1 is that the analog signal will not affect the digital signal communication. Then the single bus chip U2 is directly connected to the signal line.

[0023] refer to figure 2 , the process steps of a method for calibrating an analog sensor with built-in parameters of the present invention are as follows:

[0024] Step 1: When the host starts to communicate with the EEPROM chip, the chip must be woken up first. figure 2 The host first sends a low level with the IO2 port, the duration is ...

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Abstract

The invention provides a method for calibration and simulation of a sensor with stored parameters. The method comprises the following steps: through communication with an EEPROM chip, a host machine produces a pulse ( reset pulse) to arouse a chip, namely EEPROM chip. After being reset by the reset pulse produced by the host machine, the EEPROM chip produces a reply pulse to be confirmed by the host machine within 120us. After receiving the reply pulse, the host machine can carry out next communication if the EEPROM chip is displayed to be in an idle state. Data can be transmitted if the reset pulse can be transmitted and the reply pulse can be received correctly. The host machine stops communication by setting IO1 in a high-resistance input state to cut off a pull-up resistor. Thus a pressure sensor can transmit analog signals to realize double purposes of one line. Calibration is also completed by the communication mode. Primary calibration is carried out on a calibration console. If the pressure sensor generates errors during working temperature collection, the host machine can carry out linear error correction.

Description

technical field [0001] The invention relates to a method for calibrating an analog sensor with built-in parameters, which is suitable for real-time detection and calibration of drilling fluid pressure in the oil drilling industry. Background technique [0002] Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electricity, ships, machine tools , pipeline and many other industries. In the process of oil drilling, by using a pressure sensor to measure the pressure generated by the drilling fluid, the pressure of the drilling fluid can be observed in real time. At present, the widely used electronic pressure sensor measures the liquid pressure parameters in the vibration environment by means of 4-20ma current signal output or voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06E21B21/08
Inventor 胡铁英
Owner BEIJING LIUHE GREATNESS TECH
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