A Range Finder Based on Hom Interference Principle

A technology of HOM and range finder, which is applied in the field of new range finder, can solve the problem that it is difficult to further improve the measurement accuracy, and achieve the effect of long distance measurement

Active Publication Date: 2019-05-24
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

One of the disadvantages of the current development of distance measurement is that it is difficult to further improve the measurement accuracy (or measurement distance) while ensuring the measurement distance (or measurement accuracy)

Method used

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  • A Range Finder Based on Hom Interference Principle

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Embodiment Construction

[0020] A specific implementation of a novel range finder based on the HOM interference principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0021] An important significance of HOM interference is that it can be used to detect the coherence time of photons with ultra-short coherence time. With this technology, high-precision distance detection can be realized. Therefore, the present invention proposes a novel rangefinder based on the HOM interference principle, such as figure 1 As shown, it includes entanglement source 1, delayer 2, beam splitter 3, first detector 4, second detector 5, mirror 6, half mirror 7, DUT mirror 8 and coincidence measurement Logic calculator9.

[0022] The photon pairs produced by the entanglement source 1 (we call the photons of the upper optical path the upper photons, and the photons of the lower optical path we call the lower photons) will enter the mirror 6 and the delayer 2...

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Abstract

The invention relates to an HOM interference principle-based range finder. The HOM interference principle-based range finder includes an entanglement source, a delayer, a beam splitter, a first detector, a second detector, a reflector, a semi-transmission and semi-reflection mirror, a reflector to be measured and a coincidence measurement logical calculator; upper photons in the entanglement source are projected onto the beam splitter through the delayer; after being reflected by the semi-transmission and semi-reflection mirror or the reflector to be measured, lower photons in the entanglement source are projected onto the beam splitter; after being split, the upper photons and the lower photons are detected by the first detector and the second detector respectively; and the coincidence measurement logical calculator performs coincidence logical calculation on signals outputted by the detectors. The time delay tau of the delayer is adjusted, so that the lower photons that pass through the semi-transmission and semi-reflection mirror or the reflector to be measured and the upper photons are subjected to interference cancellation, two time delays tau 1 and tau 2 are recorded; and a distance from the reflector to be measured to the semi-transmission and semi-reflection mirror is calculated, wherein the distance is represented by an equation described in the descriptions of the invention. With the HOM interference principle-based range finder of the invention adopted, high-precision distance detection can be achieved. The HOM interference principle-based range finder can be widely applied to fields such as optical coherence tomography, biological tissue structure detection and high precision ranging.

Description

technical field [0001] The invention relates to a novel distance measuring instrument based on the principle of HOM interference, which can realize high-precision distance detection and can be widely used in the fields of optical coherence tomography, biological tissue structure detection, high-precision distance measurement and the like. Background technique [0002] The range finder is an instrument designed to measure length and distance by using the reflection and interference characteristics of light, sound waves and electromagnetic waves. calculate. The current optical ranging method is mainly laser ranging. Laser ranging is currently widely used in military fields such as terrain measurement, tactical frontier ranging, and missile trajectory tracking. It also has broad application prospects in engineering applications and biomedical fields. [0003] Laser range finders currently on the market can be divided into pulse type and continuous wave phase type according to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/48
CPCG01S17/48
Inventor 赵连洁霍娟张安宁杨然
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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