CN219391777U - Be applied to fluorescence collection device of CR scanner - Google Patents

Abstract

The utility model relates to a fluorescence collection device applied to a CR scanner, which belongs to the field of CR scanning imaging and comprises a laser collection piece, an optical fiber assembly arranged at one end of the laser collection piece and an optical filter arranged at one side of the optical fiber assembly far away from the laser collection piece; the bottom of the laser collecting piece is hollow and provided with an ellipsoidal reflector, and the top of the laser collecting piece is provided with an ellipsoidal collecting cover; the ellipsoidal mirror is provided with a first focus F1 and a second focus F2, and the laser light collecting member is penetrated by a laser light channel directed towards the first focus F1. The utility model solves the problems of low collection efficiency of weak fluorescence, contradiction between structural volume and performance efficiency and the like by utilizing the optical characteristics of the ellipsoidal mirror.

Description

Be applied to fluorescence collection device of CR scanner

Technical Field

The utility model relates to the field of CR scanning imaging, in particular to a fluorescence collection device applied to a CR scanner.

Background

For CR scanning systems, there are many factors affecting image quality, light source and power of the IP board, detector, laser, scanning speed, signal collection, signal processing, etc. Among which signal collection is the most influencing image quality. The design of signal collection is the most critical part of each CR design.

The signal collection of CR scanning systems can be divided into two main types, imaging and non-imaging.

Imaging means that the excited fluorescent signal will be collected after focusing, whereas imaging means that the fluorescent signal is collected directly or through an unfocused optical system.

The nonimaging signal collection device utilizes the characteristic that the wavelength difference between the incident laser and the excited fluorescence is large, the incident laser can irradiate on the IP board through the spectroscope by using the spectroscope, and the excited fluorescence is transmitted to the PMT through the spectroscope to collect the signal after changing the light path of the spectroscope. These types of signal collection devices all require more than one lens to be added near the IP board, so the larger the working width, the larger the lens needed and the relatively high cost.

The imaging signal collecting device is that incident laser irradiates on an IP board, fluorescence emitted from an irradiation point diverges to the periphery according to the Bolange rule, an elliptic cylindrical collecting cover is designed on the IP board, one focus of the elliptic cylindrical collecting cover is designed as the irradiation point, the fluorescence is reflected to the other focus accessory at the inner wall of the elliptic cover, and a PMT is installed at the other focus to collect the fluorescence signals. When the working width is large, the signal is difficult to collect effectively by using a single PMT, the PMT needs to be added, the efficiency is improved, the size is increased, and the cost is correspondingly increased.

Disclosure of Invention

The purpose of the utility model is that: the fluorescent collection device applied to the CR scanner is provided to solve the problems of low weak fluorescent collection efficiency, contradiction between structural volume and performance efficiency and the like.

In order to achieve the above object, the present utility model provides a fluorescence collecting device for a CR scanner, including a laser collecting member, an optical fiber assembly disposed at one end of the laser collecting member, and an optical filter disposed at a side of the optical fiber assembly away from the laser collecting member;

the bottom of the laser collecting piece is hollow and provided with an elliptical reflector, and the top of the laser collecting piece is provided with an elliptical collecting cover; the ellipsoidal mirror is provided with a first focus F1 and a second focus F2, and the laser light collecting member is penetrated by a laser light channel towards the first focus F1.

Preferably, the optical fiber assembly is located on a side of the second focal point F2 remote from the first focal point F1.

Preferably, an IP plate is arranged below the laser collecting member.

Preferably, the distance between the first focal point F1 and the IP board is smaller than the distance between the second focal point F2 and the IP board.

Preferably, a signal detector is arranged on the side of the optical filter, which is far away from the optical fiber assembly.

Preferably, the signal detector may employ sipms, PMTs, or APDs.

In summary, the utility model has the following beneficial technical effects:

the utility model solves the problems of low collection efficiency of weak fluorescence, contradiction between structural volume and performance efficiency and the like by utilizing the optical characteristics of the ellipsoidal mirror.

Drawings

FIG. 1 is a schematic view of a fluorescence collection device for a CR scanner according to the present utility model;

fig. 2 is a schematic diagram of the fermat principle of a fluorescence collection device applied to a CR scanner according to the present utility model.

Reference numerals: 1. an IP board; 21. an ellipsoidal mirror; 211. a first focal point F1; 212. a second focal point F2; 22. an elliptical collection hood; 23. a laser channel; 3. an optical fiber assembly; 4. a light filter; 5. a signal detector.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The embodiment of the utility model discloses a fluorescence collection device applied to a CR scanner, which comprises an IP plate 1, a laser collection piece arranged on the IP plate 1, an optical fiber assembly 3 arranged at one end of the laser collection piece, an optical filter 4 arranged at one side of the optical fiber assembly 3 far away from the laser collection piece, and a signal detector 5 arranged at one side of the optical filter 4 far away from the optical fiber assembly 3.

The laser collecting member is of a nearly semi-elliptic structure with a hollow interior, the inner side of the laser collecting member faces the IP plate 1 and is provided with an elliptic reflecting mirror 21, and the outer side of the laser collecting member is provided with an elliptic collecting cover 22. The ellipsoidal mirror 21 is provided with a first focal point F1 and a second focal point F2, 212, near the fiber assembly 3, the first focal point F1 211 being vertically provided with a laser channel 23 through the laser collection member.

In the present embodiment, the signal detector 5 adopts SIPM, but is not limited to SIPM, and can adopt photodetectors such as PMT, APD, etc

The technical principle of the utility model is as follows:

the utility model uses the ellipsoidal reflector 21 to transmit optical signals, and under the combined action of the geometrical characteristics of the ellipsoidal surface and the Fermat's theorem of light, the light source of the first focus F1 211 can be converged at the second focus F2 212, the transmission loss is very small, and the phases are consistent.

The ellipse has two foci, and light passing through one focus will converge to the other after reflection, which obeys the principle of the shortest optical path, ma Dingli.

Light propagates in any medium or set of different media from one point to another along a path where the time required is extreme (or equal to the adjacent path). The propagation time of a ray of light along its actual path from one point to another is smooth with respect to small variations in the path. "plateau" is understood to mean that the first derivative is taken to be 0, which may be a maximum, a minimum or an inflection point.

The technical principle of the utility model is as follows:

1. the ellipsoidal mirror 21 is required to provide a path for the incident laser light and to provide a slit in the collection cup for the laser beam to pass through. This gap will lose a small portion of the fluorescent signal. The elliptical collecting cup 22 is made of stainless steel, so that the elliptical collecting cup has enough strength to ensure no deformation even if a slot is formed in the middle of the elliptical collecting cup, and an elliptical device made of stainless steel can be manufactured by the mechanical processing technology at low cost. The fluorescent reflectivity is increased by the aid of a high-reflectivity material in the collecting cover.

Ideally a complete elliptic cylinder would transmit 100% of the signal to the collection end. However, the elliptical collection shroud 22 is placed at an angle, both the fiber position and angle have an impact on the collection efficiency. Attempts were made to adjust the parameters to optimize the collection efficiency.

2. The receiving focus attachment of the collection housing houses a fiber optic assembly 3 for receiving the excited fluorescent signal. The fluorescent signal is collected by the optical fiber and reaches the signal detector 5/PMT/APD after passing through the optical filter 4, etc

3. The filter 4 should determine the wavelength of the passing signal according to the practical requirement, and filter the redundant optical signal.

4. The signal acquisition module in the figure takes SiPM as an example, and is not limited to SiPM, but may be a photodetector such as PMT, APD, etc.

The implementation flow of the utility model is as follows:

the utility model adopts a signal collection scheme of a focusing elliptical cover and an optical fiber, wherein an opening is designed on the surface of the elliptical collection cover 22 so that laser can pass through.

The weak light generated by exciting the molecules by the laser beam is a point light source, the light source comprises a fluorescent component, the light source point is arranged on the first focus F1 211 of the ellipsoidal reflector 21 through an opening, and the light emitted by the light source is converged to the second focus F2 212 after being reflected by the ellipsoidal reflector for collection.

Due to the optical characteristics of the ellipse, the optical transmission loss focused to the second focal point F2 212 is small, the phases are consistent, and the optical transmission is basically fidelity. The connection of the second focus F2 to the light-guiding fiber will transmit this light signal to the post-analysis image.

The band-pass filter 4 is installed between the light guide fiber and the signal acquisition module, and serves as an intermediate stage for filtering extraneous superfluous wavelength components (mainly diffusely reflected laser light), removing unnecessary light (noise), and entering only through fluorescent signals.

The use of an ellipsoidal mirror is critical for efficient collection.

Finally, it should be noted that: the foregoing description of the preferred embodiments of the present utility model is not intended to be limiting, but rather, although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims (6)

1. A fluorescence collection device for a CR scanner, characterized in that: the device comprises a laser collecting piece, an optical fiber assembly (3) arranged at one end of the laser collecting piece and an optical filter (4) arranged at one side of the optical fiber assembly (3) far away from the laser collecting piece;

the bottom of the laser collecting piece is hollow and provided with an elliptical reflector (21), and the top of the laser collecting piece is provided with an elliptical collecting cover (22); the ellipsoidal mirror (21) is provided with a first focal point F1 (211) and a second focal point F2 (212), and the laser light collecting element is penetrated by a laser light channel (23) facing the first focal point F1 (211).

2. A fluorescence collection device for a CR scanner as recited in claim 1, wherein: the optical fiber assembly (3) is located on a side of the second focal point F2 (212) remote from the first focal point F1 (211).

3. A fluorescence collection device for a CR scanner as recited in claim 2, wherein: an IP plate (1) is arranged below the laser collecting piece.

4. A fluorescence collection device for a CR scanner as recited in claim 3, wherein: the distance between the first focus F1 (211) and the IP board (1) is smaller than the distance between the second focus F2 (212) and the IP board (1).

5. A fluorescence collection device for a CR scanner as recited in claim 4, wherein: a signal detector (5) is arranged on one side of the optical filter (4) away from the optical fiber assembly (3).

6. A fluorescence collection device for a CR scanner as recited in claim 5, wherein: the signal detector (5) may employ sipms, PMTs or APDs.