METHOD FOR MEASURING THE ENERGY OF PULSES OF OPTICAL RADIATION AND DEVICE FOR IMPLEMENTING SAME

• US 20140303911A1
• Filed: 11/28/2011
• Published: 10/09/2014
• Est. Priority Date: 12/14/2010
• Status: Abandoned Application

• Current Assignee: Institute of Microelectronics Chinese Academy of Sciences (Chinese Academy of Sciences)
• Original Assignee: Institute of Microelectronics Chinese Academy of Sciences (Chinese Academy of Sciences)
• Inventors: Levash, Leonid Vasilevich, Ptushinskii, Yuri Grigorievich, Samoylov, Volodymyr Borisovich
• Application Number:
  US13/992,900
• Publication Number:
  US 20140303911A1
• Time in Patent Office: Days
• US Class Current: 702/57
• CPC Class Codes: G01J 1/4257 applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam monitoring arrangements for lasers in general H01S3/0014
• CPC Class Codes: G01J 11/00 Measuring the characteristics of individual optical pulses or of optical pulse trains
• CPC Class Codes: G01J 5/34 using capacitors, e.g. pyroelectric capacitors

Abstract

What are described are: method and a device for measuring the energy of impulses of optical radiation, with aid of which a measurement error associated with the indeterminacy of the precise time at which impulse occurred between discrete readings of an analog-digital converter is reduced. The useful effect is, achieved by means of introducing a normalizing impulse converter which generates impulse electrical signals with a standard form which is not dependent on the form of the radiation impulses, and a corresponding procedure for digital signal processing.

Claims

1. Measuring method of impulse energy of optical radiation which consists in irradiation of pyroelectric detector by impulse. filtration and amplification of electric signal, which after that come into analog-digital convertor (ADC), the following transmission of digital pattern of signal into computer with the next mathematical treatment which consists of determination of zero level by part of digital pattern of signal which precedes to impulse beginning, extracting of the drop area of signal after its extremum, its extrapolation and calculation of impulse energy which differs in that the electrical signals that correspond to radiation impulses of different forms and lengths are transformed into electrical impulses of similar form and length, the marked area is approximated by straight line and moment of impulse radiation beginning is calculated by formula t_H=t₀+Δ

, where to t₀—

time of arising of the first, nonzero reading, and

2. Energy meter of impulse radiation which consists of pyroelectric detector, coupling amplifier, output of which is connected to computer, which differs in that the output of detector is connected to input of normalizing transducer of impulses, output of which is connected to input of coupling amplifier, notably normalizing transducer of impulses is performed in such a way that upper limit of spectrum of its output impulses does not exceed upper limit of operation frequency range of coupling amplifier.