CN214957785U - Be used for full fiber laser to return light monitoring and early warning device - Google Patents
Be used for full fiber laser to return light monitoring and early warning device Download PDFInfo
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- CN214957785U CN214957785U CN202121590385.3U CN202121590385U CN214957785U CN 214957785 U CN214957785 U CN 214957785U CN 202121590385 U CN202121590385 U CN 202121590385U CN 214957785 U CN214957785 U CN 214957785U
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Abstract
The utility model discloses a be used for full fiber laser to return light monitoring and early warning device, it relates to fiber laser technical field. The monitoring system comprises a photoelectric detector which is arranged right above a stripping point, and the photoelectric detector is arranged on the center of a fixing clamp. After the technical scheme is adopted, the beneficial effects of the utility model are that: the output power of the laser can be fed back to a monitoring system in real time, real-time monitoring and early warning are carried out on the abnormal condition of the input pumping power and the returned light of the optical fiber cladding at the output end through the power height difference monitored by the two groups of photoelectric detectors, and the photoelectric detectors are erected on stripping points, so that the problem of the power bearing capacity of monitoring devices is not required to be considered, and the output power of the laser is not influenced.
Description
Technical Field
The utility model relates to a fiber laser technical field, concretely relates to be used for full fiber laser to return optical monitoring and early warning device.
Background
Fiber lasers have a wide range of applications in many fields due to their excellent performance. The requirements of the fiber laser for complex application scenes are higher and higher. In addition, in consideration of the stability of the laser, the laser needs to detect the optical power of the output laser, and the currently common monitoring method for the output power of the laser generally adopts the laser output to be connected with the beam splitter for on-line monitoring, but the monitoring of the output power by adopting the method can cause large insertion loss of the device, easily causes the problems of reduction of the total output power and limited light power of the monitoring device. Reverse return light control, which is typically performed with an isolator at low power. The isolator cannot bear high power, a single CPS plus PD monitoring method is generally adopted, but the single CPS monitoring has the problem of forward pump light interference.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's defect and not enough, a be arranged in full fiber laser returns light monitoring and early warning device and can feed back laser output to monitoring system in real time, and the power height difference that monitors through two sets of photoelectric detector returns to the optical fiber covering of the pumping power abnormal conditions of input and output and returns light and carry out real-time supervision and early warning, because the photoelectric detector frame is on peeling off the point, need not to consider the problem that monitoring device bore the power size, and do not have the influence to laser output, can overcome the defect of introducing in the above background art.
In order to achieve the above purpose, the utility model adopts the following technical scheme: it includes two groups of monitoring systems arranged on the transmission double-clad optical fiber;
the transmission double-clad optical fiber comprises an optical fiber core arranged inside, and an optical fiber cladding and an optical fiber coating layer are sequentially arranged outside the optical fiber core from inside to outside;
the transmission double-clad optical fiber is characterized in that two sections of optical fiber coating layers are stripped to form two spaced stripping points, the bare optical fiber cladding layer part at the stripping points is wrapped with an optical cement layer, and the bottom of the bare optical fiber cladding layer is fixedly arranged on the heat dissipation bottom plate through the optical cement layer;
a temperature sensor for monitoring and feeding back the stripping point temperature in real time is arranged on the heat dissipation bottom plate;
the two groups of monitoring systems are respectively arranged on two spaced stripping points;
the monitoring system comprises a photoelectric detector positioned right above the stripping point, and the photoelectric detector is arranged in the center of the fixing clamp;
the bottom of the fixing clamp is fixedly arranged on the heat dissipation bottom plate after the transmission double-clad optical fiber is buckled.
The length of the peeling point is 5mm, and the interval between the two peeling points is 500 mm.
The radiating bottom plate on set up the mounting hole that is used for placing temperature-sensing ware, temperature-sensing ware passes through the fixed setting of heat conduction silica gel in the mounting hole.
The temperature sensor is arranged below the stripping point or on the periphery of the stripping point, and the temperature sensor is a temperature measuring resistor.
The fixing clamp comprises a clamp upper cover which is positioned right above the stripping point and used for installing the photoelectric detector, the bottom of the clamp upper cover is connected with four cylindrical clamp bases, and the lower parts of the four cylindrical clamp bases are connected to form a clamping groove used for buckling the transmission double-clad optical fiber.
The fixing clamp is fixed on the heat dissipation bottom plate through a fixing screw, a screw hole matched with the fixing screw is formed in the heat dissipation bottom plate, and the fixing screw is vertically and sequentially connected with the clamp upper cover and the clamp base and then is matched with the screw hole.
The optical fiber coating layer is a polymer coating.
The transmission double-clad optical fiber is a tail fiber of the laser output head, one end of the tail fiber is welded with an output optical fiber of a cladding pump stripper CPS in the laser engine module to form a welding point, and the stripping point is positioned behind the welding point.
After adopting above-mentioned technical scheme, compare in prior art and have following beneficial effect:
1. the optical fiber fusion point is not required to be increased, and the problem that the power borne by the device is required to be considered when the optical splitter is used is not required to be considered;
2. two groups of photoelectric detectors are used for power monitoring, and by comparing two groups of monitored power data, the condition that a single monitoring system cannot confirm the deviation between a monitored value and an actual value caused by the fact that the output light is stirred or the output end has return light because the forward laser and the reverse return light are simultaneously interfered can be eliminated, so that error reporting reasons and power monitoring are more accurate;
3. the power difference is monitored by two groups of photoelectric detectors, when a high-reflectivity material is processed to have larger return light or scattered light, the laser returning to the optical fiber is greatly increased, the area ratio of a cladding to the core diameter is very large, the proportion of the light entering the cladding is larger, when the power monitored by the photoelectric detector close to the output end is larger than the power detected by the front-end photoelectric detector, the normal output of the pump light and the normal output of the laser are indicated, but the reverse return light is abnormal, at the moment, a monitoring signal is fed back to a circuit, the power-off protection can be carried out, and the damage to devices and an optical fiber structure caused by the reflected light of the cladding is reduced;
4. the power difference is monitored by the two groups of photoelectric detectors, after the laser is started, when the pumping power is suddenly increased due to unstable circuit current or other problems, the fluctuation of the output power is increased, the power monitored by the front-end photoelectric detector close to the CPS is larger than the power difference monitored by the rear-end photoelectric detector, the power is fed back to a laser circuit system to form a closed loop, the power supply is timely turned off or the pumping current is reduced, the situation that the output power of a pumping tube is increased due to the sudden increase of the output current of the circuit, the power exceeds the bearing power of a device, and the device is damaged is avoided.
4. The temperature sensor is used for monitoring the temperature of the stripping point in real time, the problems that the stripping point is blown due to overhigh temperature of the stripping point when the radiating effect of the radiating bottom plate is poor and the monitoring power is changed greatly are solved, and the shutdown early warning protection is carried out when the set threshold temperature is exceeded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of the overall structure and position of the monitoring system of the present invention;
fig. 2 is a schematic structural diagram of the present invention;
fig. 3 is a partial structural schematic diagram of the present invention;
fig. 4 is a schematic structural diagram of the middle transmission double-clad optical fiber 1 according to the present invention;
fig. 5 is a schematic structural diagram of the present invention for processing high reflectivity materials, wherein the reflected or scattered light enters the cladding of the optical fiber.
Description of reference numerals: the optical fiber monitoring system comprises a transmission double-clad optical fiber 1, an optical fiber core 11, an optical fiber cladding 12, an optical fiber coating layer 121, an optical cement layer 13, a monitoring system 2, a photoelectric detector 21, a clamp upper cover 22, a clamp base 23, a fixing screw 24, a heat dissipation bottom plate 3, a temperature sensor 31, a laser engine module 4, a cladding pumping stripper CPS41, a laser output head 5 and a high-reflectivity material 6.
Detailed Description
Referring to fig. 1 to 5, the technical solution adopted by the present embodiment is: the optical fiber monitoring system comprises two groups of monitoring systems 2 arranged on a transmission double-clad optical fiber 1;
the transmission double-clad optical fiber 1 comprises an optical fiber core 11 arranged inside, and an optical fiber cladding 12 and an optical fiber coating layer 121 are sequentially arranged outside the optical fiber core 11 from inside to outside;
the transmission double-clad optical fiber 1 is stripped of two sections of optical fiber coating layers 121 to form two spaced stripping points, the part of the bare optical fiber cladding 12 at the stripping points is provided with an optical cement layer 13 through ultraviolet light source curing, and the bottom of the bare optical fiber cladding 12 is fixedly arranged on the heat dissipation bottom plate 3 through the optical cement layer 13;
a temperature sensor 31 for monitoring and feeding back the stripping point temperature in real time is arranged on the heat dissipation bottom plate 3;
the two groups of monitoring systems 2 are respectively arranged on two spaced stripping points;
the monitoring system 2 comprises a photoelectric detector 21 positioned right above the stripping point, and the photoelectric detector 21 is arranged in the center of the fixing clamp; the corresponding speed of the photoelectric detector 21 is fast, and the test is accurate, so that the fast, real-time and on-line monitoring of the laser power can be realized;
the bottom of the fixing clamp is buckled with the transmission double-clad optical fiber 1 and then is fixedly arranged on the heat dissipation bottom plate 3.
The length of the peeling point is 5mm, and the interval between the two peeling points is 500 mm.
Radiating bottom plate 3 on offer the mounting hole that is used for placing temperature-sensing ware 31, temperature-sensing ware 31 passes through the fixed setting of heat conduction silica gel in the mounting hole.
The temperature sensor 31 is disposed below the peeling point or on the periphery of the peeling point, and the temperature sensor 31 is a temperature measuring resistor.
The fixing clamp comprises a clamp upper cover 22 which is positioned right above the stripping point and used for installing the photoelectric detector 21, four cylindrical clamp bases 23 are fixedly installed at the bottom of the clamp upper cover 22, and the lower parts of the four cylindrical clamp bases 23 are connected to form a clamping groove used for buckling the transmission double-clad optical fiber 1.
The fixing clamp is fixedly installed on the heat dissipation bottom plate 3 through a fixing screw 24, a screw hole matched with the fixing screw 24 is formed in the heat dissipation bottom plate 3, and the fixing screw 24 is vertically and sequentially connected with the clamp upper cover 22 and the clamp base 23 and then is matched with the screw hole.
The optical fiber coating layer 121 is a polymer coating layer.
The transmission double-clad optical fiber 1 is a tail fiber of the laser output head 5, one end of the tail fiber is welded with an output optical fiber of a cladding pump stripper CPS41 in the laser engine module 4 to form a welding point, and the stripping point is positioned behind the welding point.
When the laser output head 5 is used for processing the high-reflectivity material 6, the reflected or scattered light of the processing surface can enter the double-clad optical fiber cladding transmitted in the laser output head 5.
The utility model discloses a theory of operation: the utility model discloses can use in common continuous wave high power fiber laser:
when the device is used, residual pump light is stripped from bare fiber cladding parts with two ends of 5mm stripped on a transmission double-cladding fiber through a photoresist layer to convert the output power of laser in proportion, and the output power data monitored by two groups of monitoring systems are analyzed for comparison, so that the deviation of a monitoring value and an actual value of a single monitoring system caused by monitoring errors is eliminated, and more accurate output power is obtained;
after a laser is started, when pumping power suddenly rises due to unstable circuit current or other problems, output power fluctuation can be increased, so that light which is stripped from a stripping point of a monitoring system close to the CPS is more, the power monitored by the monitoring system close to the CPS is increased, the power difference with the power monitored by a rear-end monitoring system is larger, the power is fed back to a laser circuit system to form a closed loop, a power supply is timely turned off, and the situation that the output power of a pumping tube is increased due to sudden increase of circuit output current and exceeds the bearing power of a device to damage the device is avoided;
after the laser is started, when a reflective material is processed, a part of output light of a processing surface of the high-reflective material is reflected or scattered into the laser output head, the fiber cladding of the double-clad fiber in the output head is reversely transmitted, when return light is transmitted in the fiber cladding, the light which is stripped from a stripping point close to the laser output head by the optical cement layer is increased due to the cladding light reflected by the fiber cladding of the laser output head, so that the power monitored by a monitoring system close to the laser output head is suddenly increased, the power difference with the power monitored by a monitoring system at the front end is larger, the power is fed back to a laser circuit system to form a closed loop, a power supply is timely turned off, the situation that the return light damages to internal devices of the laser are avoided, meanwhile, real-time monitoring and early warning are carried out on the temperature of the stripping point through a temperature sensor, and the situation that the stripping point is burnt off due to overhigh temperature of the stripping point is prevented.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The utility model provides a be used for full fiber laser to return light monitoring and early warning device which characterized in that: it includes two groups of monitoring systems arranged on the transmission double-clad optical fiber;
the transmission double-clad optical fiber comprises an optical fiber core arranged inside, and an optical fiber cladding and an optical fiber coating layer are sequentially arranged outside the optical fiber core from inside to outside;
the transmission double-clad optical fiber is characterized in that two sections of optical fiber coating layers are stripped to form two spaced stripping points, the bare optical fiber cladding layer part at the stripping points is wrapped with an optical cement layer, and the bottom of the bare optical fiber cladding layer is fixedly arranged on the heat dissipation bottom plate through the optical cement layer;
a temperature sensor for monitoring and feeding back the stripping point temperature in real time is arranged on the heat dissipation bottom plate;
the two groups of monitoring systems are respectively arranged on two spaced stripping points;
the monitoring system comprises a photoelectric detector positioned right above the stripping point, and the photoelectric detector is arranged in the center of the fixing clamp;
the bottom of the fixing clamp is fixedly arranged on the heat dissipation bottom plate after the transmission double-clad optical fiber is buckled.
2. The device according to claim 1, wherein the device comprises: the length of the peeling point is 5mm, and the interval between the two peeling points is 500 mm.
3. The device according to claim 1, wherein the device comprises: the radiating bottom plate on set up the mounting hole that is used for placing temperature-sensing ware, temperature-sensing ware passes through the fixed setting of heat conduction silica gel in the mounting hole.
4. The device according to claim 1, wherein the device comprises: the temperature sensor is arranged below the stripping point or on the periphery of the stripping point, and the temperature sensor is a temperature measuring resistor.
5. The device according to claim 1, wherein the device comprises: the fixing clamp comprises a clamp upper cover which is positioned right above the stripping point and used for installing the photoelectric detector, the bottom of the clamp upper cover is connected with four cylindrical clamp bases, and the lower parts of the four cylindrical clamp bases are connected to form a clamping groove used for buckling the transmission double-clad optical fiber.
6. The device according to claim 5, wherein the device comprises: the fixing clamp is fixed on the heat dissipation bottom plate through a fixing screw, a screw hole matched with the fixing screw is formed in the heat dissipation bottom plate, and the fixing screw is vertically and sequentially connected with the clamp upper cover and the clamp base and then is matched with the screw hole.
7. The device according to claim 1, wherein the device comprises: the optical fiber coating layer is a polymer coating.
8. The device according to claim 1, wherein the device comprises: the transmission double-clad optical fiber is a tail fiber of the laser output head, one end of the tail fiber is welded with an output optical fiber of a cladding pump stripper CPS in the laser engine module to form a welding point, and the stripping point is positioned behind the welding point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121590385.3U CN214957785U (en) | 2021-07-14 | 2021-07-14 | Be used for full fiber laser to return light monitoring and early warning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121590385.3U CN214957785U (en) | 2021-07-14 | 2021-07-14 | Be used for full fiber laser to return light monitoring and early warning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214957785U true CN214957785U (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121590385.3U Active CN214957785U (en) | 2021-07-14 | 2021-07-14 | Be used for full fiber laser to return light monitoring and early warning device |
Country Status (1)
| Country | Link |
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| CN (1) | CN214957785U (en) |
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2021
- 2021-07-14 CN CN202121590385.3U patent/CN214957785U/en active Active
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