CN110968140A - Temperature control technology of laser during continuous measurement - Google Patents
Temperature control technology of laser during continuous measurement Download PDFInfo
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- CN110968140A CN110968140A CN201911281440.8A CN201911281440A CN110968140A CN 110968140 A CN110968140 A CN 110968140A CN 201911281440 A CN201911281440 A CN 201911281440A CN 110968140 A CN110968140 A CN 110968140A
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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Abstract
The invention relates to a temperature control technology of a laser during continuous measurement, which comprises the following specific steps: the temperature control part of the laser is completed by a high-performance temperature controller HTC1500, a PI control loop is designed into a bipolar current source, a resistance temperature sensor and a built-in sensor bias current are used, a diode is added to operate a resistance heater by using a unipolar output current, an onboard reference voltage simplified potentiometer controls a temperature set point, remote operation can be carried out by using an external fixed point voltage selectively, and two monitors are connected with the temperature fixed point voltage and the actual sensor voltage. According to the temperature control technology of the laser during continuous measurement, the temperature controller is additionally arranged on the laser, and the code is written on software to control the switch of the laser, so that the temperature control of the laser can be realized, and the phenomenon that the optical frequency domain reflectometer generates a large amount of heat during continuous measurement work to cause damage to the laser and financial loss is effectively avoided.
Description
Technical Field
The invention relates to the technical field of high-end equipment manufacturing, in particular to a temperature control technology of a laser during continuous measurement.
Background
The high-end equipment manufacturing industry is also called advanced equipment manufacturing industry, and refers to the industry for producing and manufacturing advanced industrial facilities and equipment with high technology and high added value, the optical frequency domain reflectometer is high-end equipment, the use field is very wide, and a laser device is a device capable of emitting laser. The first microwave quantum amplifier was made in 1954, and a highly coherent microwave beam was obtained, and the basic working principle of various lasers is the same except for the free electron laser. The indispensable conditions for generating laser light are population inversion and gain larger than loss, so that the indispensable components in the device are two parts, an excitation (or pumping) source, and a working medium with metastable energy level. The excitation is that the working medium is excited to an excited state after absorbing external energy, and conditions are created for realizing and maintaining population inversion. The excitation modes include optical excitation, electric excitation, chemical excitation, nuclear energy excitation and the like. The working medium has a metastable energy level to dominate the stimulated emission, thereby achieving optical amplification. A common component of a laser is a resonant cavity, but the resonant cavity (optical resonant cavity) is not an essential component, and the resonant cavity can make photons in the cavity have consistent frequency, phase and running direction, so that the laser has good directivity and coherence. Moreover, it can shorten the length of working substance, and can regulate the mode of produced laser by changing the length of resonant cavity (i.e. mode selection), so that the general laser possesses resonant cavity.
When the existing optical frequency domain reflectometer is used for continuous measurement, a laser generates a large amount of heat, and the laser is damaged due to the fact that the temperature of the laser is too high.
Disclosure of Invention
The present invention provides a temperature control technique for a laser during continuous measurement, so as to solve the problems in the background art that the laser generates a large amount of heat during the continuous measurement operation of the conventional optical frequency domain reflectometer, and the laser is damaged due to an excessively high temperature.
A temperature control technology of a laser during continuous measurement specifically comprises the following steps: the temperature control part of the laser is completed by a high-performance temperature controller HTC1500, a PI control loop is designed into a bipolar current source, and a resistance temperature sensor and a built-in sensor bias current are used.
Preferably, an additional diode operates the resistance heater with unipolar output current, and an onboard reference voltage simplifies potentiometer control for temperature set point.
Preferably, the remote operation is optionally performed with an external setpoint voltage, and the two monitors are connected to the temperature setpoint voltage and the actual sensor voltage.
Preferably, the temperature is controlled to 25 ℃ at room temperature during operation, the TEC current is limited to 1.4A, and the bias current is set to 200 uA.
Preferably, the monitoring voltage corresponding to normal operation is 2V, whether the temperature control part normally operates can be judged by detecting the operating voltage of the pin of the controller, and if the pin voltage deviates from 2V, it indicates that the temperature control part has a problem.
Preferably, a micro heat dissipation fan is arranged inside the laser, and the micro heat dissipation fan is electrically connected with the temperature control part of the laser.
Preferably, a humidity controller is further arranged inside the laser, and the humidity controller is connected with the temperature controller in parallel.
Preferably, the humidity controller and the temperature controller are both controlled by a Central Processing Unit (CPU), the humidity controller and the temperature controller receive instructions and transmit the instructions to the CPU for processing, and the CPU feeds back the received information after processing the received information to the humidity controller and the temperature controller, so that the humidity controller and the temperature controller are controlled to operate, and cooling and dehumidification are completed.
Preferably, the temperature control part of the laser is completed by a high-performance temperature controller HTC1500, which can achieve the temperature stability of 0.001 ℃, and in order to achieve higher efficiency and maximum stability, linearity, a PI control loop is designed into a bipolar current source, the HTC temperature controller is small and exquisite and is easy to be equipped with any design, and the temperature over-suppression and stability can be optimized by modifying independently adjustable proportional gain (P) and integral time constant (I).
Preferably, after the optical frequency domain reflectometer is finished, the laser is immediately shut down, and the system consists of an optical fiber grating temperature sensor, a transmission line, a signal acquisition device and display control software. The fiber bragg grating temperature sensor is directly installed on a position which is easy to heat, such as a joint of a static contact or a busbar, and the like, the temperature signal of the sensor is gathered on a main transmission optical cable through an optical splitter and is transmitted to an optical fiber sensing host, the temperature change of a measured point is monitored in real time, early warning and alarming of faults are achieved through various temperature alarming modes, when the faults occur, the early warning and alarming can be rapidly and accurately given out, alarming information can be provided, the fault can be accurately located, and timely processing by maintenance personnel is facilitated.
Compared with the prior art, the invention has the following beneficial effects: the temperature control technology of the laser during continuous measurement is characterized in that a temperature controller is additionally arranged on the laser, codes are written on software to control the on-off of the laser, the temperature control of the laser can be realized, the phenomenon that a light frequency domain reflectometer generates a large amount of heat during continuous measurement work and causes damage to the laser and financial loss is effectively avoided, a micro cooling fan is arranged inside the laser, the heat dissipation of the laser is facilitated, the service life of the laser is ensured, the humidity controller can control the humidity inside the laser and ensure the drying inside the laser, so that the influence of humidity on the inside of the laser is avoided, the service environment of the laser is ensured, the service life of the laser is prolonged, the sensor is of an all-fiber type, does not need to be powered on site, is not influenced by electromagnetic interference, vibration, lightning stroke and nuclear radiation, and can be applied to high-temperature lightning stroke for a long time, The temperature measuring precision can reach 0.5 ℃, the temperature resolution can reach 0.1 ℃, the high-voltage equipment can be continuously monitored on line at 365 x 24h all the year round, and the high-voltage equipment is in a real-time monitoring state.
Drawings
FIG. 1 is a block diagram of an HTC1500 temperature controller of the present invention;
fig. 2 is a schematic diagram of the temperature controller of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A temperature control technology of a laser during continuous measurement specifically comprises the following steps: the temperature control part of the laser is completed by a high-performance temperature controller HTC1500, a PI control loop is designed into a bipolar current source, a resistance temperature sensor and a built-in sensor bias current are used, a diode is added to operate a resistance heater by using a unipolar output current, an on-board reference voltage simplified potentiometer controls a temperature set point, remote operation can be performed by using an external fixed point voltage selectively, two monitors are connected with the temperature fixed point voltage and an actual sensor voltage, the temperature is controlled to be 25 ℃ at room temperature during working, the TEC current is limited to be 1.4A, the bias current is set to be 200uA, the monitoring voltage corresponding to normal working is 2V, whether the temperature control part normally works or not can be judged by detecting the working voltage of a controller pin, if the pin voltage deviates from 2V, the problem of the temperature control part occurs, a miniature cooling fan is arranged inside the laser, the miniature radiating fan is electrically connected with the temperature control part of the laser, the inside of the laser is also provided with a humidity controller, the humidity controller is connected with the temperature controller in parallel, the humidity controller and the temperature controller are controlled by a central processing CPU, the humidity controller and the temperature controller receive instructions and transmit the instructions to the central processing CPU for processing, the central processing CPU feeds back the received information after processing the information and feeds the information back to the humidity controller and the temperature controller, thereby controlling the humidity controller and the temperature controller to operate, completing temperature reduction and dehumidification, the humidity controller can control the humidity inside the laser and ensuring the drying inside the laser, thereby avoiding the influence of humidity on the inside of the laser, ensuring the service environment of the laser and prolonging the service life of the laser, the temperature control part of the laser is completed by a high-performance temperature controller HTC1500, the temperature sensor can achieve the temperature stability of 0.001 ℃, in order to achieve higher efficiency and maximum stability, the PI control ring is designed into a bipolar current source, the HTC temperature controller is small and exquisite and is easy to be equipped with any design phase, and almost any type of temperature sensor can be used with the temperature sensor as long as the resistance temperature sensor and a built-in sensor bias current are simply used. Through modifying the independently adjustable proportional gain (P) and the integral time constant (I), the temperature over-suppression and stability are optimized, after the optical frequency domain reflectometer is tested, the laser is immediately shut down, and the system consists of an optical fiber grating temperature sensor, a transmission line, a signal acquisition device and display control software. The fiber bragg grating temperature sensor is directly installed on a position which is easy to heat, such as a joint of a static contact or a busbar, and the like, the optical branching device collects temperature signals of the sensor on a main transmission optical cable and transmits the temperature signals to an optical fiber sensing host, the temperature change of a measured point is monitored in real time, early fault early warning and alarming are realized through various temperature alarming modes, when a fault occurs, the alarm can be quickly and accurately given out to provide alarm information, the fault can be accurately positioned, and maintenance personnel can conveniently and timely handle the fault, the sensor is of an all-fiber type, does not need to supply power on site, is not influenced by electromagnetic interference, vibration, lightning stroke and nuclear radiation, can be applied to severe environments such as high temperature, high humidity and chemical erosion for a long time, the temperature measuring precision can reach 0.5 ℃, the temperature resolution can reach 0.1 ℃, 365 x 24h can be continuously monitored on.
In summary, a single resistive load sets the maximum output current, the HTC1500 temperature controller is configured as a single diode with unipolar output current to operate the resistive heater, an on-board reference voltage simplified potentiometer controls the temperature setpoint, and optionally an external setpoint voltage for remote operation, and two monitors are connected to the temperature setpoint voltage and the actual sensor voltage (as shown in fig. 1). The HTC1500 has proven its reliability in different neighborhoods such as medicine, defense, communications, manufacturing, etc.; the design of strict reference circuit diagram of being connected of controller and laser instrument, the mark is the same in chip supply voltage and the circuit diagram, the temperature controller principle (as shown in fig. 2), through increase temperature controller on the laser instrument, write the switch of code control laser instrument on the software, can realize the temperature control to the laser instrument, the effectual optical frequency domain reflectometer that has avoided produces a large amount of heats at continuous measurement during operation, cause the damage of laser instrument and the loss on the financial affairs, and be provided with miniature radiator fan through the inside at the laser instrument, make things convenient for the heat dissipation of laser instrument, guarantee the life of laser instrument, humidity controller can control the inside humidity of laser instrument, guarantee the inside drying of laser instrument.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (10)
1. A temperature control technology of a laser during continuous measurement specifically comprises the following steps: the temperature control part of the laser is completed by a high-performance temperature controller HTC1500, a PI control loop is designed into a bipolar current source, and a resistance temperature sensor and a built-in sensor bias current are used.
2. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: a diode is added to operate the resistance heater with unipolar output current, and an onboard reference voltage simplifies the potentiometer control to the temperature set point.
3. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: optionally, remote operation can be performed with an external setpoint voltage, and two monitors are connected to the temperature setpoint voltage and the actual sensor voltage.
4. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: and when the device works, the temperature is controlled to be 25 ℃ at room temperature, the TEC current is limited to 1.4A, and the bias current is set to 200 uA.
5. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: the monitoring voltage corresponding to normal working is 2V, whether the temperature control part works normally can be judged by detecting the working voltage of the pin of the controller, and if the pin voltage deviates from 2V, the problem of the temperature control part is shown.
6. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: the laser is internally provided with a miniature radiating fan, and the miniature radiating fan is electrically connected with the temperature control part of the laser.
7. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: the laser is also internally provided with a humidity controller, and the humidity controller is connected with the temperature controller in parallel.
8. The technique of claim 7, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: the humidity controller and the temperature controller are controlled by the central processing CPU, the humidity controller and the temperature controller receive instructions and transmit the instructions to the central processing CPU for processing, and the central processing CPU feeds back the received information after processing the received information and feeds the information back to the humidity controller and the temperature controller, so that the humidity controller and the temperature controller are controlled to operate, and cooling and dehumidification are completed.
9. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: the temperature control part of the laser is completed by a high-performance temperature controller HTC1500, which can reach the temperature stability of 0.001 ℃, and in order to reach higher efficiency and maximum stability, the PI control loop is designed into a bipolar current source, the HTC temperature controller is small and exquisite and is easy to be equipped with any design phase, and the temperature over-suppression and stability are optimized by modifying independently adjustable proportional gain (P) and integral time constant (I).
10. The technique of claim 1, wherein the temperature of the laser is controlled during the continuous measurement, and the technique further comprises: and after the optical frequency domain reflectometer is tested, the laser is immediately shut down, and the system consists of an optical fiber grating temperature sensor, a transmission line, signal acquisition equipment and display control software. The fiber bragg grating temperature sensor is directly installed on a position which is easy to heat, such as a joint of a static contact or a busbar, and the like, the temperature signal of the sensor is gathered on a main transmission optical cable through an optical splitter and is transmitted to an optical fiber sensing host, the temperature change of a measured point is monitored in real time, early warning and alarming of faults are achieved through various temperature alarming modes, when the faults occur, the early warning and alarming can be rapidly and accurately given out, alarming information can be provided, the fault can be accurately located, and timely processing by maintenance personnel is facilitated.
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| CN201911281440.8A CN110968140A (en) | 2019-12-13 | 2019-12-13 | Temperature control technology of laser during continuous measurement |
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| CN201911281440.8A CN110968140A (en) | 2019-12-13 | 2019-12-13 | Temperature control technology of laser during continuous measurement |
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