An ultra-high time resolution photonic doppler velocimeter

Abstract

The utility model discloses a kind of photonic Doppler velocimeters of ultra-high time resolution, belong to laser interferometric velocity measurement field, including laser, dichroic mirror, frequency doubler, fiber coupler, optical fiber probe.Semi-transparent half-mirror, detector, oscilloscope.Laser, frequency doubler, dichroic mirror, fiber coupler, optical fiber probe, semi-transparent half-mirror, detector form optical path system, by setting laser, the laser of output and frequency doubler, optical path system cooperation, the time resolution of photonic Doppler velocimeter can be improved, more accurate to monitor data, and reduce the original optical path complexity.

Description

Technical Field

[0001] This utility model relates to the field of laser interferometry, specifically to a photon Doppler velocimeter. Background Technology

[0002] Photon Doppler velocimeters are based on the optical Doppler effect and utilize optical interference mixing technology to obtain velocity information of objects. They play a crucial role in numerous research fields, including shock wave physics, detonation physics, internal ballistics research, new materials science, the interaction between high-energy particles and materials, space science, geological science, medical diagnostics, research on the dynamic mechanical properties of materials, and damage effect experiments. The laser output from a photon Doppler velocimeter is transmitted to the surface of the sample through an output fiber. A fiber optic probe then collects the signal light reflected from the sample surface, which contains the Doppler frequency shift. This signal light is transmitted through the signal fiber to the internal interferometer system for interference processing, demodulating the Doppler frequency shift of the reflected laser to accurately obtain the continuous velocity change process. However, due to technological limitations, current photon Doppler velocimeters cannot improve their time resolution or monitor data with greater precision, and their internal optical path connections are complex. Summary of the Invention

[0003] To overcome the shortcomings of current technology, this invention provides a photon Doppler velocimeter with ultra-high time resolution, which can improve the time resolution of the photon Doppler velocimeter during the velocity measurement process.

[0004] The implementation scheme of this application is a photon Doppler velocimeter with ultra-high time resolution, belonging to the field of laser interferometric velocimetry. It includes a laser, a dichroic mirror, a frequency doubler, an optical fiber coupler, an optical fiber probe, a semi-transparent mirror, a detector, and an oscilloscope. The optical path system consists of a first laser, a dichroic mirror, a first frequency doubler, an optical fiber coupler, an optical fiber probe, a second laser, a second frequency doubler, a semi-transparent mirror, and a detector.

[0005] The light emitted by the first laser in the optical path system passes through a dichroic mirror and enters a fiber optic coupler. The fiber optic coupler is connected to a fiber optic probe. The light from the first laser is directed from the fiber optic probe to the object under test. The reflected light, known as the return light, returns along the same path from the fiber optic probe and enters the first frequency doubler. The frequency doubler doubles the frequency of the return light before directing it to a semi-transparent mirror. Simultaneously, the light from the second laser enters the second frequency doubler, which also doubles the frequency before directing it to the semi-transparent mirror. The two beams interfere on the mirror surface and finally reach the detector, where they are converted into electrical signals and displayed on an oscilloscope. Compared with current technology, the advantage of this invention is that using this optical path system can double the time resolution of the exported data. Attached Figure Description

[0006] Figure 1This is a schematic diagram illustrating the principle of a photon Doppler velocimeter with ultra-high time resolution according to this utility model.

[0007] Figure 2 This is a schematic diagram of an embodiment of a photon Doppler velocimeter with ultra-high time resolution according to the present invention, wherein 1-first laser, 2-dichroic mirror, 3-first frequency doubler, 4-fiber coupler, 5-fiber probe, 6-object under test, 7-second laser, 8-second frequency doubler, 9-semi-transparent and semi-reflective mirror, 10-detector, and 11-oscilloscope. Detailed Implementation

[0008] The present invention will be further described below with reference to embodiments and illustrations, but is not limited to the scope of protection of the present invention.

[0009] This embodiment discloses an ultra-high time resolution photon Doppler velocimeter, comprising a first laser, a dichroic mirror, a first frequency doubler, an optical fiber coupler, an optical fiber probe, a second laser, a second frequency doubler, a semi-transparent mirror, a detector, and an oscilloscope.

[0010] The first laser, the second laser, the first frequency doubler, and the second frequency doubler all operate at a wavelength of 1550 nm, using spatial light for illumination. The first laser is optically coupled to a dichroic mirror, the dichroic mirror is optically coupled to one end of an optical fiber coupler and one end of the first frequency doubler, the other end of the first frequency doubler is optically coupled to one end of the optical fiber coupler, and the optical fiber probe is connected to the optical fiber coupler. The second laser is optically coupled to one end of the second frequency doubler, the other end of the second frequency doubler is optically coupled to a semi-transparent mirror, the semi-transparent mirror is optically coupled to the dichroic mirror, the detector's optical probe is optically coupled to the semi-transparent mirror, and the detector's signal output is connected to an oscilloscope. In this embodiment, the optical fiber probe can be any one of a dual-fiber probe, a triple-fiber probe, a microlens array probe, a multi-directional fiber optic probe, or an internal ballistic fiber optic probe.

[0011] The first laser emits a near-infrared laser with a wavelength of 1550nm. A dichroic mirror, through optical coupling, ensures that the laser light from the first laser can pass through the dichroic mirror and enter the fiber coupler. After reaching the fiber coupler, the laser light from the first laser is emitted from the fiber probe and strikes the surface of the object being measured. The resulting backlight passes through the fiber probe again and returns to the first frequency multiplier. The first frequency multiplier multiplies the backlight to a wavelength of 775nm. The dichroic mirror is selected with a working wavelength of 1000nm. Through optical coupling, it ensures that the backlight emitted by the first frequency multiplier is reflected from its own surface onto the surface of the semi-transparent mirror. The second laser emits a near-infrared laser with a wavelength of 1550nm as a reference light. It enters the second frequency multiplier for frequency multiplication. The semi-transparent mirror, through optical coupling, ensures that the frequency-multiplied reference light can pass through itself, and the frequency-multiplied backlight is reflected from its own surface. The reference light and the backlight interfere with each other in the semi-transparent mirror and then enter the detector. The detector converts the interfered light into an electrical signal, which is displayed as a waveform on an oscilloscope.

[0012] Data can be exported from an oscilloscope and processed in computer data processing software to obtain the velocity curve of the measured object. Since the laser emitted by the laser is processed by the optical path system and the wavelength of the light entering the detector is 775nm, compared with the original laser wavelength of 1550nm, its frequency has been doubled, so the time resolution of the data has also been doubled.

[0013] The above detailed description further illustrates the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A photon Doppler velocimeter with ultra-high time resolution, characterized by comprising a first laser, a dichroic mirror, a first frequency doubler, an optical fiber coupler, an optical fiber probe, a second laser, a second frequency doubler, a semi-transparent mirror, a detector, and an oscilloscope. The first laser is optically coupled to the dichroic mirror; the dichroic mirror is optically coupled to one end of the optical fiber coupler and one end of the first frequency doubler; the other end of the first frequency doubler is optically coupled to one end of the optical fiber coupler; the optical fiber probe is connected to the optical fiber coupler; the second laser is optically coupled to one end of the second frequency doubler; the other end of the second frequency doubler is optically coupled to the semi-transparent mirror; the semi-transparent mirror is optically coupled to the dichroic mirror; the optical probe of the detector is optically coupled to the semi-transparent mirror; and the signal output terminal of the detector is connected to the oscilloscope.

2. The ultra-high time resolution photon Doppler velocimeter according to claim 1, characterized in that: The computer data processing software processes the data exported from the oscilloscope.

3. The ultra-high time resolution photon Doppler velocimeter according to claim 1, characterized in that: The dichroic mirror operates at a wavelength of 1000 nm.

4. The ultra-high time resolution photon Doppler velocimeter according to claim 1, characterized in that: The laser, whose frequency doubler operates at a wavelength of 1550nm, uses spatial light.

5. The ultra-high time resolution photon Doppler velocimeter according to claim 1, characterized in that: The fiber optic probe is any one of the following: dual-fiber probe, triple-fiber probe, microlens array probe, multi-directional fiber optic probe, or internal ballistic fiber optic probe.

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