Wide-range high-precision micro current measurement system and method

A measurement system and high-precision technology, applied in the direction of measurement using digital measurement technology, can solve the problems of severe compression, difficult to obtain, difficult compensation of thermistors, etc., and achieve the effect of wide-range current measurement

Active Publication Date: 2018-06-01
BEIJING SDL TECH
View PDF6 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general method is to use the pair of tubes made on the same chip to offset the reverse saturation current Is of the middle PN junction, and use the thermistor to compensate the thermal voltage VT, but it is difficult for the thermistor to make the most appropriate compensation in a wide range. Moreover, it is troublesome to choose and match, ev

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wide-range high-precision micro current measurement system and method
  • Wide-range high-precision micro current measurement system and method
  • Wide-range high-precision micro current measurement system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] The present embodiment 1 is a wide-range high-precision micro-current measurement system, such as image 3 As shown, the system includes a multiple square root signal converter 1, an analog-to-digital conversion circuit 2 and a microprocessor circuit 3, and the multiple square root signal converter 1 includes a logarithmic operation circuit 11, an adder 12, an exponent Operation circuit 13. Wherein, the multiple square root signal converter 1 adopts a basic square root signal compression method, such as Figure 5 as shown, Figure 5 It is a basic circuit for multiple square root signal converters in the square root signal compression mode.

[0082] See Figure 5 , the operational amplifier U1 and the transistor Q1A, the operational amplifier U2B and the transistor Q2B all constitute a logarithmic operation circuit 11, and the output voltage is:

[0083]

[0084] See Figure 5 , the operational amplifier U2A constitutes the adder 12, if the resistance R4=R5=R7, t...

Embodiment 2

[0095] Embodiment 2 is a wide-range high-precision micro-current measurement system, such as image 3 As shown, the system includes a multiple square root signal converter 1, an analog-to-digital conversion circuit 2 and a microprocessor circuit 3, and the multiple square root signal converter 1 includes a logarithmic operation circuit 11, an adder 12, an exponent Operation circuit 13. Wherein, the multiple square root signal converter 1 adopts a square root signal improved compression method, such as Image 6 as shown, Image 6 An improved circuit for multiple square root signal converters in square root signal compression mode.

[0096] See Image 6 , the operational amplifier U1 in the logarithmic operation circuit of the current measurement part is cleverly used as the adder 12 to simplify the circuit. The collector of the transistor Q1A is connected to the inverting terminal 2, and the base is connected to the same-phase terminal 3. Short, so the triode Q1A and the op...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a wide-range high-precision micro current measurement system and method. The system comprises a multiple root signal converter, an analog-to-digital conversion circuit and a microprocessor circuit, wherein the multiple root signal converter comprises a logarithmic transformation circuit, an adder and an exponential transformation circuit; the logarithmic transformation circuit receives a to-be-measured micro current signal and a reference current signal, and logarithmic transformation is carried out respectively to output two voltage signals to the adder; the adder sums up the voltage signals and the sum is transmitted to the exponential transformation circuit; the exponential transformation circuit receives the sum and carries out exponential transformation, and an analog voltage signal is outputted to the analog-to-digital conversion circuit; the analog-to-digital conversion circuit receives the analog voltage signal, converts the analog voltage signal to a digital signal and transmits the digital signal to the microprocessor circuit; and the microprocessor circuit receives the digital signal, multiple square operation is carried out to restore the valueof a to-be-measured current signal, and current measurement is completed. High measurement precision is achieved in a whole range.

Description

technical field [0001] The invention relates to a micro-current measurement system and method, in particular to a wide-range and high-precision micro-current measurement system and method, which can be applied to the detection field of ion current, photocurrent and other weak currents in various instruments and equipment. Background technique [0002] In instrument measurement, it is often necessary to detect various current signals, such as the current of ion fragments bombarded by the ionization source of a mass spectrometer, the ionization current of a gas chromatograph hydrogen flame, the total ion current converted from vacuum by an ionization vacuum gauge, and weak light signals The generated photocurrent and so on, these current signals are often ranging from "fA" level to "mA" level, not only require extremely weak current detection capability, but also require sufficient measurement resolution in a relatively wide measurement range, so The wide-range weak current me...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 张云
Owner BEIJING SDL TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap