[introduction] basis The odd photon avalanche of the gules LED that place of Using LED As A Single Photon Detector[1] introduces is retrorse effect of puncture electric current, ? In Bo Wen The odd photon phenomenon in the retrorse puncture process that checks a few LED [2] In have a test to a few kinds of LED of at hand, ? Discover only two infra-red LED can appear phenomenon of retrorse avalanche puncture, other LED does not have this kind of circumstance. ? To same kind of infra-red LED, discover through the test they are retrorse the character of avalanche puncture also each are not identical, ? Undertake checking a record in the light of the circumstance that appears among them below.

Puncture of 01 retrorse avalanches

One, setting introduction

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According to The odd photon avalanche of the gules LED that place of Using LED As A Single Photon Detector[1] introduces is retrorse effect of puncture electric current, ? In Bo Wen The odd photon phenomenon in the retrorse puncture process that checks a few LED [2] In have a test to a few kinds of LED of at hand, ? Discover only two infra-red LED can appear phenomenon of retrorse avalanche puncture, other LED does not have this kind of circumstance. ? To same kind of infra-red LED, discover through the test they are retrorse the character of avalanche puncture also each are not identical, ? Undertake checking a record in the light of the circumstance that appears among them below.

Graph the 1.1.1 different character that test infra-red LED retrorse puncture

2, test program

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Test circuit still uses digital direct current source to bring to bear on reversely through series connection resistor in LED the measurement of two end means, the voltage that goes up through measuring R2 will detect the signal of electric current of LED retrorse puncture. ? Observe the voltage signal on R2 through oscillograph, judge LED puncture character. ? Infra-red to at hand LED undertakes one by one measure below, observe characteristic of signal of electric current of corresponding and retrorse puncture.

Graph graph of 1.2.1 tests circuit

3, test result

1, type of common high pressure

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This is to appear type of electric current of LED of retrorse avalanche electric current. ? The avalanche electric current that retrorse puncture of this kind of LED appears several in common desktop brillant circumstance falls, more concentrated.

Graph electric current of 1.3.1 occurrence retrorse avalanche puncture

2, low-pressure type

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Voltage of LED retrorse puncture is 50V left and right sides about in front, ? There still is one sort LED now retrorse puncture voltage is controlled for 30V. ? The pulse that this kind of LED appears compared with in front high-pressured puncture circumstance a little number is a few less.

Graph LED of 1.3.2 low-pressure puncture

These infra-red LED exteriors look and distinguish without what, but their retrorse puncture voltage differs really very big. ? 30V, 50V, ? When checking to every so, need to be adjusted carefully.

3, few and far between pulse

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When having retrorse breakdown of a kind of infra-red LED, occurrence pulse number is more few and far between. ? In same illumination first, signal of pulse of avalanche of retrorse puncture of this kind of LED is apparently little. ? The time of the tall n of pulse and low n is longer.

Graph type of 1.3.3 few and far between pulse

4, without pulse type

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This kind of LED is in puncture and end between, do not have occurrence pulse signal. ? Can see puncture electric current is not quite stable. Can appear bigger wave motion.

Graph 1.3.4 without pulse type

5, dense type

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This is a kind of interpose at notting have pulse and have the kind between pulse. ? Can see voltaic signal is put in dense wave motion, the range that Dan Bo uses is compared mostly finely. ? If use hand keep out illuminant, can see pulse signal appears.

Graph 1.3.5 dense and fluctuant types

To in front the LED that does not have pulse type, pass light of LED of hand keep out, they still cannot appear pulse. ? Return without pulse type and dense type so not identical.

6, slant type of buy electric current

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The pulse signal of the occurrence of this kind of LED, low n cannot achieve 0V. ? Their output signal has a dc to slant reversely on the foundation of pulse signal buy electric current.

Graph 1.3.6 slant type of buy electric current

4, different type scale

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Pass the sorting of infra-red to about 100 same batch LED, ? Can see the LED that has an in part about among them does not have signal of avalanche pulse electric current. ? Have the LED of avalanche pulse signal, ? Their pulse type also is belonged to in front different type.

Graph the LED that 1.4.1 same batch have 50% to control about is outputted without pulse

Summary

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The article undertakes to retrorse puncture of a kind of infra-red LED the experiment checks, ? Discover they are retrorse the different type of puncture. ? Among them retrorse puncture meets partial LED signal of electric current of avalanche of occurrence sheet photon.

Reference material

[1]Using LED As A Single Photon Detector: Https://physicsopenlab.org/2020/02/27/using-led-as-a-single-photon-detector/

[The retrorse puncture that 2] checks a few LED crosses the odd photon phenomenon in Cheng: Https://zhuoqing.blog.csdn.net/article/details/128598987

Origin: Zhuo Qing, tsinghuaJoking

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