CN216746483U - Laser instrument temperature-detecting device - Google Patents
Laser instrument temperature-detecting device Download PDFInfo
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- CN216746483U CN216746483U CN202220182728.0U CN202220182728U CN216746483U CN 216746483 U CN216746483 U CN 216746483U CN 202220182728 U CN202220182728 U CN 202220182728U CN 216746483 U CN216746483 U CN 216746483U
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Abstract
The utility model relates to the field of laser temperature detection, in particular to a laser temperature detection device; the laser temperature detection device comprises a detection unit, a circuit board and an optical module arranged on the circuit board, wherein the optical module comprises an optical device shell, a laser arranged in the optical device shell and a thermistor attached to the side surface of the laser, a first test point and a second test point are arranged on the circuit board, the first test point and the second test point are arranged outside the optical module, the first test point is electrically connected with a first end point of the thermistor, the second test point is electrically connected with a second end point of the thermistor, and the detection unit is respectively electrically connected with the first test point and the second test point; according to the utility model, the thermistor is arranged on the side surface of the laser, and two electrodes of the thermistor are led out of the optical device shell to measure the resistance value, so that the actual temperature of the laser is obtained, and the temperature detection precision of the laser is improved.
Description
Technical Field
The utility model relates to the field of laser temperature detection, in particular to a laser temperature detection device.
Background
The conventional laser temperature detection device is difficult to directly measure the front temperature of the laser, so that the temperature measurement result is not accurate enough.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the present invention is to provide a laser temperature detection device, which overcomes the defect that the detection result of the existing laser temperature detection device is not accurate enough.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the laser temperature detection device is provided, and the preferable scheme is as follows: a laser instrument temperature-detecting device is characterized in that: the laser temperature detection device comprises a detection unit, a circuit board and an optical module arranged on the circuit board, wherein the optical module comprises an optical device shell, a laser arranged in the optical device shell and a thermistor adhered to the side surface of the laser, a first test point and a second test point are arranged on the circuit board, the first test point and the second test point are arranged outside the optical module, the first test point is electrically connected with a first end point of the thermistor, the second test point is electrically connected with a second end point of the thermistor, and the detection unit is respectively electrically connected with the first test point and the second test point so as to be used for detecting the resistance of the thermistor.
Wherein, the preferred scheme is as follows: a first connecting line is arranged between the first testing point and the first end point of the thermistor, and a second connecting line is arranged between the second testing point and the second end point of the thermistor.
Wherein, the preferred scheme is: the optical device shell is provided with a first through hole and a second through hole, one end of the first connecting line is connected with the first end point of the thermistor, and the other end of the first connecting line passes through the first through hole to be connected with the first test point; one end of the second connecting line is connected with the second end point of the thermistor, and the other end of the second connecting line penetrates through the second through hole to be connected with the second test point.
Wherein, the preferred scheme is: the circuit board is provided with a first circuit and a second circuit, the input end of the first circuit is connected with the first end point of the thermistor, the other end of the first circuit is connected with the first test point, the input end of the second circuit is connected with the second end point of the thermistor, and the other end of the second circuit is connected with the second test point.
Wherein, the preferred scheme is as follows: a third connecting line is arranged between the detection unit and the first test point, and a fourth connecting line is arranged between the detection unit and the second test point.
Wherein, the preferred scheme is as follows: the laser temperature detection device further comprises a first bonding pad, the first bonding pad is attached to the side face of the laser, and the thermistor is arranged in the first bonding pad.
Wherein, the preferred scheme is as follows: the laser is a vertical cavity surface emitting laser.
Wherein, the preferred scheme is as follows: the optical module further comprises a driving module, a transimpedance amplifier and an optical monitoring module, wherein the driving module, the transimpedance amplifier and the optical monitoring module are arranged in the optical device shell, the driving module is connected with the laser, and the optical monitoring module is connected with the transimpedance amplifier.
Wherein, the preferred scheme is as follows: the detection unit comprises a power module and a pull-up resistor, one end of the pull-up resistor is connected with the positive pole of the power module, the other end of the pull-up resistor is connected with the first test point, and the second test point is connected with the negative pole of the power module.
Wherein, the preferred scheme is as follows: the detection unit comprises a power module, a pull-up resistor and a main control module, one end of the pull-up resistor is connected with the positive electrode of the power module, the other end of the pull-up resistor is respectively connected with the first test point and the I/O port of the main control module, and the second test point is connected with the negative electrode of the power module.
The utility model has the advantages that compared with the prior art, the thermistor is directly arranged on the side surface of the laser, the first test point and the second test point are arranged on the circuit board and correspond to the area outside the optical device shell, the first end point and the second end point of the thermistor are respectively led out of the optical device shell and led in the first test point and the second test point, the resistance value of the thermistor is measured outside the shell through the detection unit outside the optical device shell, the temperature of the thermistor is obtained through the relation curve of the resistance value of the thermistor and the temperature characteristic, the thermistor is tightly attached to the side surface of the laser and is very close to the actual temperature of the laser, the surface temperature measurement of the laser in the small-size optical module is further realized, and the accuracy of the measurement result is higher.
Drawings
The utility model will be further described with reference to the following figures and examples, in which:
FIG. 1 is a first schematic structural diagram of a laser temperature detection device according to the present invention;
FIG. 2 is a schematic structural diagram of a laser temperature detection device according to the present invention;
FIG. 3 is a schematic structural diagram III of a laser temperature detection device according to the present invention;
fig. 4 is a schematic structural diagram of a light module in the present invention;
FIG. 5 is a first schematic structural diagram of a detecting unit according to the present invention;
fig. 6 is a schematic structural diagram of a detection unit in the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 3, the present invention provides a preferred embodiment of a laser temperature detection device.
Referring to fig. 1, the laser temperature detection device includes a circuit board 1, an optical module 2 disposed on the circuit board 1, and a detection unit 3, the optical module 2 comprises an optical device shell 21, a laser 22 arranged in the optical device shell 21 and a thermistor 23 attached to the side surface of the laser 22, the circuit board 1 is provided with a first test point 11 and a second test point 12, and the first test point 11 and the second test point 12 are arranged outside the optical module 2, the first test point 11 is electrically connected with a first terminal of the thermistor 23, the second test point 12 is electrically connected to a second end point of the thermistor 23, and the detection unit 3 is electrically connected to the first test point 11 and the second test point 12, respectively, so as to detect a resistance value of the thermistor 23.
Specifically, the laser temperature detection device is mainly used for detecting the front temperature of the laser 22 in the optical module 2. The optical module 2 is arranged on the circuit board 1, and comprises an optical device shell 21, a laser 22 arranged in the optical device shell 21, and a thermistor 23 arranged in the optical device shell 21, wherein the thermistor 23 is attached to the side surface of the laser 22 to obtain the temperature of the laser 22.
The first test point 11 and the second test point 12 are respectively arranged on the circuit board 1 and are arranged in an area outside the optical device housing 21, and the first test point 11 and the second test point 12 are respectively connected with a first end point and a negative electrode of the thermistor 23 so as to lead out two ends of the thermistor 23 inside the optical device housing 21 to the outside of the housing 21, so that the detection unit 3 outside the housing 21 can measure the voltage at two ends of the thermistor 23.
Due to the miniaturization of the optical module 2, the laser 22 is compactly arranged in the optical device case 21 of the optical module 2, and it is difficult to directly detect the temperature of the laser 22. In the conventional temperature detection method for the laser 22 inside the optical module 2, the thermistor 23 is disposed on the optical device housing 21 of the optical module 2, and the temperature of the laser 22 is detected by testing the temperature of the optical module 2, because the thermistor 23 is far away from the laser 22, the heat conductivity of the circuit board 1 is not good, and the detected temperature is easily different from the actual temperature of the laser 22.
At present, the thermistor 23 is also arranged on the circuit board 1 at the back of the laser 22 to detect the back temperature of the laser 22, because the circuit board 1 has a certain thickness and the heat dissipation capability of the circuit board 1 is not very good, the back design of the laser 22 is different, and these factors all affect the detection result, which easily causes a large difference between the detected temperature and the actual temperature of the laser 22.
In order to make the detected temperature closer to the actual temperature of the laser 22, the front temperature of the laser 22 needs to be directly measured, and since the laser 22 is disposed in the optical device housing 21 of the optical module 2 and the internal space of the optical device housing 21 is limited, it is impossible to directly dispose the temperature detection module on the front of the laser 22 to detect the front temperature of the laser 22.
In this embodiment, the laser temperature detection apparatus directly sets the thermistor 23 on the side of the laser 22, and sets two test points on the circuit board 1 and corresponding to the area outside the optical device housing 21, where the two test points are the first test point 11 and the second test point 12, and the first end point and the second end point of the thermistor 23 are led out of the housing 21 and led into the first test point 11 and the second test point 12, so that the resistance value of the thermistor 23 can be measured outside the optical device housing 21 by the detection unit 3 outside the optical device housing 21, and the temperature of the thermistor 23 can be obtained by the relationship curve between the resistance value of the thermistor 23 and the temperature characteristic, and since the thermistor 23 is tightly attached to the side of the laser 22, the temperature of the thermistor is very close to the actual temperature of the laser 22.
It should be noted that, in this embodiment, the laser 22 is a vertical cavity surface emitting laser 22, and the vertical cavity surface emitting laser 22 is an f-p laser 22 whose light emitting direction is perpendicular to the surface of the resonant cavity, and the size of the laser is small, and the laser is covered by the optical device housing 21 after wire bonding, so that it is difficult to directly test the surface temperature of the laser, and the temperature testing method is very suitable for the vertical cavity surface emitting laser 22.
Further, two test points are led out from the area on the circuit board 1 and corresponding to the outside of the optical device housing 21, and different embodiments may be specifically adopted according to actual situations.
Scheme one
Referring to fig. 1, the wiring of the circuit board 1 is performed between the first end of the thermistor 23 and the first test point 11 on the surface of the circuit board 1 to form a first circuit 13, and the input end of the first circuit 13 is connected to the first end of the thermistor 23, and the output end of the first circuit 13 is connected to the first test point 11, and similarly, the wiring of the circuit board 1 is performed between the second end of the thermistor 23 and the second test point 12 on the surface of the circuit board 1 to form a second circuit 14, and the input end of the second circuit 14 is connected to the second end of the thermistor 23, and the output end of the second circuit 14 is connected to the second test point 12.
In the scheme, two end points of the thermistor 23 are led out to the first test point 11 and the second test point 12 outside the optical device shell 21 mainly by using a wiring mode on the surface of the circuit board 1, so that the resistance value between the two end points can be conveniently tested by the detection unit 3 to obtain the temperature of the thermistor 23, and further obtain the actual temperature of the laser 22.
Scheme two
Referring to fig. 2, a first connection line 15 is disposed between the first test point 11 and a first end point of the thermistor 23, a second connection line 16 is disposed between the second test point 12 and a second end point of the thermistor 23, a first through hole is formed in a position of the optical device housing 21 corresponding to the first connection line 15 for avoiding the first connection line 15, and a second through hole is formed in a position corresponding to the second connection line 16 for avoiding the second connection line 16, one end of the first connection line 15 is connected to the first end point of the thermistor 23, the other end thereof passes through the first through hole and is connected to the first test point, one end of the second connection line 16 is connected to the second end point of the thermistor 23, and the other end thereof passes through the second through hole and is connected to the second test point.
According to the scheme, two end points of the thermistor are respectively led out to a first test point 11 and a second test point 12 outside an optical device shell 21 in a jumper connection mode, so that a resistance value between the two end points can be conveniently tested by a detection unit 3, the temperature of the thermistor 23 can be obtained, and the actual temperature of the laser 22 can be further obtained.
Further, referring to fig. 1 and fig. 2, the first test point 11 and the second test point 12 are connected to the detecting unit 3 mainly by using a jumper connection. Namely, a third connecting line 17 is arranged between the detecting unit 3 and the first test point 11, and a fourth connecting line 18 is arranged between the detecting unit 3 and the second test point 12.
Specifically, one end of the third connection line 17 is connected to the detection unit 3, and the other end thereof is connected to the first test point 11, and one end of the fourth connection line 18 is connected to the detection unit 3, and the other end thereof is connected to the second test point 12.
The first test point 11 and the second test point 12 are led into the detection unit 3 through the third connecting line 17 and the fourth connecting line 18, voltage measurement between the first test point 11 and the second test point 12 is performed, so that the resistance value of the thermistor 23 is obtained, the temperature of the thermistor 23 is obtained according to the relation curve of the resistance value and the temperature characteristic of the thermistor 23, the thermistor 23 is directly attached to the side surface of the laser 22, the temperature of the thermistor is very close to the actual temperature of the laser 22, and the actual temperature of the laser 22 can be deduced according to the temperature of the thermistor 23.
In one embodiment, and referring to fig. 3, the laser temperature detection apparatus further includes a first pad 4, the first pad 4 is attached to a side surface of the laser 22, and the thermistor 23 is disposed in the first pad 4.
Specifically, after the type and size of the thermistor 23 are selected, a pad matching the size of the thermistor 23 is provided on the side of the laser 22 according to the size of the thermistor 23 actually used, and then the thermistor 23 is directly attached to the pad.
As shown in fig. 4, the present invention provides a preferred embodiment of the optical module.
Referring to fig. 4, the optical module 2 further includes a driving module 24, a transimpedance amplifier 25 and an optical monitoring module 26 disposed in the optical device housing 21, where the driving module 24 is connected to the laser 22, and the optical monitoring module 26 is connected to the transimpedance amplifier 25.
Specifically, the driving module 24 is connected to the laser 22, the laser 22 emits laser light under the driving of the driving module 24, and the optical monitoring module 26 may adopt a photodiode, and is mainly used for backlight monitoring of the laser 22, and then amplifies an optical signal through the transimpedance amplifier 25.
As shown in fig. 5 and 6, the present invention provides a preferred embodiment of the detecting unit.
Scheme one
Referring to fig. 5, the detection unit 3 includes a power module 31 and a pull-up resistor R, one end of the pull-up resistor R is connected to the positive electrode of the power module 31, the other end of the pull-up resistor R is connected to the first test point 11, and the second test point 12 is connected to the negative electrode of the power module 31.
Specifically, the power module 31 is mainly configured to provide a known stable voltage, a specific resistance value of the pull-up resistor R may be selected according to an actual situation, one end of the pull-up resistor R is connected to the positive electrode of the power module 31, that is, one end of the pull-up resistor R is connected to a stable voltage, the other end of the pull-up resistor R is connected to the first test point 11, and is connected to two ends of the pull-up resistor R through a voltmeter 5, so as to directly detect the voltage at the two ends of the pull-up resistor R, and thus, the resistance value of the thermistor 23 may be obtained through a relational expression calculation.
The resistance of the thermistor 23 can be obtained by a relation (VCC-V)/R ═ V/Rntc, to obtain Rntc ═ V ═ R/(VCC-V), where VCC is a stable voltage provided by the power module 31 and is a known value, V is a voltage across the pull-up resistor R and can be directly measured and obtained by a voltmeter and is also a known value, and R is the resistance of the pull-up resistor R and is a known value.
After the resistance value of the thermistor 23 is calculated by the above relational expression, the temperature of the thermistor 23 can be obtained from the characteristic curve of the resistance value of the thermistor 23 and the temperature.
Scheme two
Referring to fig. 6, the detection unit 3 includes a power module 31, a pull-up resistor R and a main control module 32, one end of the pull-up resistor R is connected to a positive electrode of the power module 31, the other end of the pull-up resistor R is connected to the first test point 11 and the I/O port of the main control module 32, respectively, and the second test point 12 is connected to a negative electrode of the detection unit 3.
Specifically, the power module 31 is mainly configured to provide a known stable voltage, the specific resistance of the pull-up resistor R may be selected according to an actual situation, one end of the pull-up resistor R is connected to the positive electrode of the power module 31, that is, one end of the pull-up resistor R is connected to a stable voltage, and the other end of the pull-up resistor R is connected to the first test point 11 and an I/O port of the main control module 32, so that data received by the main control module 32 through the I/O port may pass through an internal acquisition circuit thereof to perform voltage acquisition on the pull-up resistor R, and the resistance of the thermistor 23 may be obtained by acquiring voltages at two ends of the pull-up resistor R.
The resistance of the thermistor 23 can be obtained by a relation (VCC-V)/R ═ V/Rntc, to obtain Rntc ═ V ═ R/(VCC-V), where VCC is a stable voltage provided by the power module 31 and is a known value, V is a voltage at both ends of the pull-up resistor R, and can be obtained by voltage acquisition through the I/O port by the main control module 32 and is also a known value, and R is a resistance of the pull-up resistor R and is a known value.
After the resistance value of the thermistor 23 is calculated by the above relational expression, the temperature of the thermistor 23 can be obtained from the characteristic curve of the resistance value of the thermistor 23 and the temperature.
Scheme three
The detection unit 3 may be a voltmeter.
Specifically, the first test point 11 and the second test point 12 can be directly accessed through a voltmeter to detect the voltage between the first test point 11 and the second test point 12, so as to obtain the resistance of the thermistor 23.
It should be noted that the first end point of the thermistor and the second end point of the thermistor are referred to as two ends of the thermistor, respectively.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover all equivalent variations and modifications within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A laser instrument temperature-detecting device is characterized in that: the laser temperature detection device comprises a detection unit, a circuit board and an optical module arranged on the circuit board, wherein the optical module comprises an optical device shell, a laser arranged in the optical device shell and a thermistor attached to the side surface of the laser, a first test point and a second test point are arranged on the circuit board and arranged outside the optical module, the first test point is electrically connected with a first end point of the thermistor, the second test point is electrically connected with a second end point of the thermistor, and the detection unit is respectively electrically connected with the first test point and the second test point so as to be used for detecting the resistance of the thermistor.
2. The laser temperature detection apparatus according to claim 1, wherein: a first connecting line is arranged between the first testing point and the first end point of the thermistor, and a second connecting line is arranged between the second testing point and the second end point of the thermistor.
3. The laser temperature detection apparatus according to claim 2, wherein: the optical device shell is provided with a first through hole and a second through hole, one end of the first connecting line is connected with the first end point of the thermistor, and the other end of the first connecting line passes through the first through hole to be connected with the first test point; one end of the second connecting line is connected with the second end point of the thermistor, and the other end of the second connecting line penetrates through the second through hole to be connected with the second test point.
4. The laser temperature detection apparatus according to claim 1, wherein: the circuit board is provided with a first circuit and a second circuit, the input end of the first circuit is connected with the first end point of the thermistor, the other end of the first circuit is connected with the first test point, the input end of the second circuit is connected with the second end point of the thermistor, and the other end of the second circuit is connected with the second test point.
5. The laser temperature detection apparatus according to claim 1, wherein: a third connecting line is arranged between the detection unit and the first test point, and a fourth connecting line is arranged between the detection unit and the second test point.
6. The laser temperature detection apparatus according to claim 1, wherein: the laser temperature detection device further comprises a first bonding pad, the first bonding pad is attached to the side face of the laser, and the thermistor is arranged in the first bonding pad.
7. The laser temperature detection apparatus according to claim 1, wherein: the laser is a vertical cavity surface emitting laser.
8. The laser temperature detection apparatus according to claim 1, wherein: the optical module further comprises a driving module, a transimpedance amplifier and an optical monitoring module, wherein the driving module, the transimpedance amplifier and the optical monitoring module are arranged in the optical device shell, the driving module is connected with the laser, and the optical monitoring module is connected with the transimpedance amplifier.
9. The laser temperature detection apparatus according to claim 1, wherein: the detection unit comprises a power module and a pull-up resistor, one end of the pull-up resistor is connected with the positive pole of the power module, the other end of the pull-up resistor is connected with the first test point, and the second test point is connected with the negative pole of the power module.
10. The laser temperature detection apparatus according to claim 1, wherein: the detection unit comprises a power module, a pull-up resistor and a main control module, one end of the pull-up resistor is connected with the power module, the other end of the pull-up resistor is respectively connected with the first test point and an I/O port of the main control module, and the second test point is connected with the negative electrode of the power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220182728.0U CN216746483U (en) | 2022-01-21 | 2022-01-21 | Laser instrument temperature-detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220182728.0U CN216746483U (en) | 2022-01-21 | 2022-01-21 | Laser instrument temperature-detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216746483U true CN216746483U (en) | 2022-06-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220182728.0U Active CN216746483U (en) | 2022-01-21 | 2022-01-21 | Laser instrument temperature-detecting device |
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| Country | Link |
|---|---|
| CN (1) | CN216746483U (en) |
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2022
- 2022-01-21 CN CN202220182728.0U patent/CN216746483U/en active Active
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Address after: 518000 No. 35, Cuijing Road, Pingshan New District, Shenzhen, Guangdong Patentee after: Ona Technology (Shenzhen) Group Co.,Ltd. Address before: 518000 No. 35, Cuijing Road, Pingshan New District, Shenzhen, Guangdong Patentee before: O-NET COMMUNICATIONS (SHENZHEN) Ltd. |
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