SU571788A1 - Meter of single light pulse duration - Google Patents

Description

(54) MEASURING DURATION OF SINGLE LIGHT PULSES

The invention is; to the field of measurement technology and can be used to measure the duration of short light pulses.

Measuring instruments for the duration of light pulses are known, in which the pulse duration is determined by the number of activated bistable elements.

A known meter for the duration of a single light pulse contains a light pulse circulation circuit, including a translucent mirror, one hundred percent reflecting mirrors, a light intensity amplifier, a light pulse counter at the output of the circulation circuit, a beam splitter and a circulating light pulse, connected in series to the circuit. circulation, optical delay, determined by the length of the path of propagation of the light pulse after the splitter - splitter. However, there is a great difficulty in the initial setup of the device and the need to strictly maintain the stability of the highest conditions to ensure the accuracy of the intention 2.

The purpose of the invention is to simplify the measurement process. For this purpose, a two-input element I is included in the circulation circuit of the Gwet pulse, the first input of which is connected to the splitter splitter directly, and the second through the optical delay, the output radiation of the And element coinciding with the circulation direction of the measured light pulse.

The drawing shows the proposed meter.

It includes the source 1 of the measured single light pulse, the beam splitter 2, (100% reflecting mirror 3, light, splitter splitter 4 of the circulating optical pulse, 100% reflective mirrors 5-7, revolving prism 8 only internal reflection of transmitted light, 100% reflective mirror 9 Amplifier 1O light intensity, count-p6 chik 11 light pulses and two input element I 12.

The radiation from source 1 is fed to the beam splitter 2. The radiation transmitted through che. cut beam splitter 2 (translucent grain

kalo), reflected from the mirror 3, goes to the splitter-splitter 4, where a part is reflected at the first input of the element 12, and the other part through the wind chamber 5 and 7, through the reverse of the full internal reflection 8 enters the 100% reflective mirror 9 from which is fed to the second input of the element I. The radiation transmitted through the element 12, having reflected from the mirror 6 and passed through the amplifier 10, the intensity of the light, goes to the beam splitter 2

The radiation from the source 1, reflected from the light of the separator 2, is combined with the radiation transmitted through the beam splitter 2 from the light intensity amplifier 1O, and is applied to the pulse counter 11.

The radiation from the amplifier 1O and reflected from the beam splitter 2, combines with the radiation transmitted through the beam splitter. 2 from the source of measured light pulses 1. Elements 2-6 limit the closed circulation circuit. Measuring the duration of a single light pulses is as follows.

A certain definite difference D P of the optical lengths of the path of the light pulse from the splitter divider 4 to each of the inputs of the two-input element I is preliminarily established. This difference in optical lengths creates a delay in time Dt during the passage of circulating pulses the distance from splitter 4 to each of the inputs of the element And 12. (C - the speed of light for a given environment).

Dalve, the measured pulse from the source 1 hits the beam splitter 2, partially passes it, and partially reflects to the pulse counter 11. A light pulse incident on the counter 11 is absorbed and recorded in it.

The part of the pulse passing through divider 2 is reflected from mirror 3 and falls into split splitter 4, where it is divided into two parts (by intensity).

Since the difference in path lengths for the pulses of light from the divider 4 divider 4 to the primary transducer and the second inputs of the element 12, was established in advance, the light pulses will therefore

arrive at the inputs of the element And 12 with a shift in time on the value of D. At the exit of omenta 12, a light pulse is observed, the duration of which is more than the length of the pulse (Tvlnhpgi of the initial impulse of a2L1.

The resulting pulse is amplified further by an amplifier of the intensity of light 10, a beam splitter 2 passes and is divided into two parts. One part is recorded and absorbed by counter 11, the other part is reflected and begins to circulate around the optical path. After each cycle of circulation, the pulse is shortened in duration by 2At and is recorded in pulse counter 11. Circulation continues until the light pulse completely disappears due to its systematic shortening.

The pulse duration is determined by the formula

TP 2l {(p-1),

where m is the pulse counter reading. The measurement error is determined by the accuracy of the

Claims (2)

Invention Formula A single light pulse duration meter containing a light pulse circulation circuit, including a translucent mirror, one hundred percent reflecting mirrors, a light intensity amplifier, a light pulse counter at the circuit output, a circulating light pulse splitter, connected in series and a circulation loop optical. the delay determined by the path of the propagation of the light pulse after the splitter divider, characterized in that, in order to simplify the measurement process, the two-input element I is included in the circulation loop of the light pulse, the first input of which is directly connected to the splitter splitter and the second - through the optical delay, with the output radiation of the element And coinciding with the direction of circulation of the measured light pulse. Sources of information taken into force during the examination: 1, certificate of author's certificate no. 2195371/10, cl. G 04 F 13 / O2, O2.12.75. 2. USSR author's certificate number 392448, cl. St O4 F 13/02. 19G8.  f