Multi-stage temperature control joint debugging system and method for optical resonant cavity

Abstract

This invention relates to the field of optical resonator technology and discloses a multi-stage temperature control and adjustment system for optical resonators. The system includes multiple temperature sensors connected in series and parallel. All temperature sensors are of the same type and can be hardware-equivalent to a single resistor. Only one temperature preprocessing and analog-to-digital conversion circuit is needed for signal acquisition. It includes four temperature sensors R1, R2, R3, and R4, where R1 and R2 are connected in parallel, and R3 and R4 are connected in parallel. Alternatively, R1 and R2 can be connected in series, and R3 and R4 in series. The multi-stage temperature control and adjustment system for optical resonators includes two heating modules, one a high-power heating module and the other a low-power heating module. This invention reduces the number of temperature preprocessing and analog-to-digital conversion circuits, lowers software or firmware complexity, improves the sensitivity and reliability of temperature acquisition, and enables uniform monitoring of temperatures at different locations inside the cavity.

Description

Technical Field

[0001] This invention relates to the field of optical resonator technology, and in particular to a multi-stage temperature control and tuning system and method for optical resonators. Background Technology

[0002] Traditional temperature control systems typically employ a single heating module and simple feedback control methods (such as PID control), whose point-source heat input makes it difficult to achieve uniform heat flow distribution. Experimental data shows that when the cavity diameter exceeds 100 mm, this approach leads to a temperature gradient of 0.5-1.2 °C at the edge region, severely affecting optical phase consistency. Conventional PID controllers exhibit significant hysteresis when dealing with nonlinear thermal systems; under a ±2 °C step change in ambient temperature, the system recovery time is as long as 120-180 seconds, accompanied by an overshoot of ±0.03 °C. Furthermore, sparse temperature sensor networks (typically ≤4 sensors) result in insufficient accuracy in thermal field reconstruction. Monte Carlo simulations reveal that using an 8-sensor layout can reduce the measurement error to ±0.01 °C. It is evident that achieving a uniform temperature distribution within the cavity is difficult, easily leading to temperature gradient errors, which in turn affect the stability and measurement accuracy of the optical system. Research on temperature control technology for high-precision optical resonant cavity systems faces significant limitations of traditional methods. In addition, traditional systems typically require complex circuit designs and multiple temperature acquisition points, increasing system complexity and cost. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention aims to provide a multi-level temperature control and adjustment system and method for optical resonant cavities, which can reduce the number of temperature preprocessing and analog-to-digital conversion circuits, reduce the complexity of software or firmware, improve the sensitivity and reliability of temperature acquisition, and realize uniform monitoring of temperature at different locations inside the cavity.

[0004] The present invention is achieved by the following technical solution: a multi-stage temperature control and adjustment system for an optical resonant cavity, including multiple temperature sensors connected in series and parallel. The multiple temperature sensors are of the same type and can be equivalent to a resistor in hardware. Only one temperature preprocessing and analog-to-digital conversion circuit is needed for signal acquisition.

[0005] The multi-stage temperature control system for optical resonant cavities includes four temperature sensors R1, R2, R3, and R4, where R1 and R2 are connected in parallel; R3 and R4 are connected in parallel, and Rx = R1 / / R2 + R3 / / R4.

[0006] R1 and R2 are connected in series; R3 and R4 are connected in series, and Rx = (R1 + R2) / / (R3 + R4).

[0007] The multi-stage temperature control system for optical resonant cavities includes two heating modules, one of which is a high-power heating module and the other is a low-power heating module.

[0008] A multi-stage temperature control method for optical resonators, using the aforementioned multi-stage temperature control system for optical resonators, includes the following steps:

[0009] Step 1: Set the control temperature in the system to T. When the cavity temperature is below T-5, both heating modules will operate in maximum power mode.

[0010] Step 2: When the cavity temperature is between T-5 and T-1, shut down one of the first heating modules 1, and at the same time, the other heating module exits the full power heating mode. Use active disturbance rejection control or PID control methods to control parameters within this temperature range to reduce overshoot and shorten the system stabilization time while ensuring heating power.

[0011] Step 3: After the cavity temperature reaches T-1, adopt ADRC (Active Disturbance Rejection Control) or PID (Proportional, Integral, Derivative) control methods and use control parameters. In order to ensure the accuracy of temperature control within this temperature range, the heating power can be appropriately reduced.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. The present invention provides a multi-stage temperature control and adjustment system for an optical resonant cavity, which can reduce the number of temperature pretreatment and analog-to-digital conversion circuits and reduce the complexity of software or firmware.

[0014] 2. The present invention provides an adjustable re-incidence integrating cavity measurement adjustment method, which can improve the sensitivity and reliability of temperature acquisition and realize uniform monitoring of temperature at different locations inside the cavity. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the sensor parallel connection in the multi-stage temperature control and adjustment system for the optical resonant cavity of the present invention;

[0016] Figure 2 This is a circuit diagram of the sensor series connection in the multi-stage temperature control and adjustment system for the optical resonant cavity of the present invention;

[0017] Figure 3 This is a flowchart of the multi-stage temperature control method for optical resonant cavities in this invention. Detailed Implementation

[0018] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0019] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-stage temperature control and adjustment system and method for optical resonant cavities.

[0020] Example 1

[0021] This embodiment provides a multi-stage temperature control and adjustment system for optical resonant cavities, which includes multiple temperature sensors connected in parallel and series. The average value is taken in hardware, eliminating the need for additional temperature acquisition preprocessing and analog-to-digital conversion circuits. The software or firmware only needs to process the value from one temperature sensor.

[0022] Taking a cavity containing four temperature sensors as an example, the following two methods can be used, with specific connection methods as follows:

[0023] Reference Figure 1 As shown, Rx = R1 / / R2 + R3 / / R4, where R1 / / R2 and R3 / / R4 represent two resistors connected in parallel.

[0024] Reference Figure 2 As shown, Rx = (R1 + R2) / / (R3 + R4).

[0025] R1, R2, R3, and R4 represent temperature sensors, such as thermistors, platinum resistance thermometers, and thermocouples.

[0026] Because the same type of temperature sensor is used, the four temperature sensors can be equivalent to a single resistor in hardware. Only one temperature preprocessing and analog-to-digital conversion circuit is needed for signal acquisition, which reduces the number of temperature preprocessing and analog-to-digital conversion circuits and reduces the complexity of software or firmware.

[0027] The optical resonant cavity temperature uniform heating technology specifically employs four temperature sensors, which are arranged in parallel and series within the cavity, equivalent to a single thermistor (e.g., ...). Figure 2(As shown). This series-parallel connection method has two modes: parallel mode and series mode. The parallel mode can improve the stability and reliability of the signal; while the series mode forms a series sensor and is used to extend the measurement range or enhance the signal strength. The above-mentioned equivalent thermistor is then connected to the temperature preprocessing and analog-to-digital conversion circuit (ADC) to form a complete temperature acquisition circuit. In this way, the system can acquire the temperature information inside the cavity in real time and convert it into a digital signal for the processor to process.

[0028] This connection method not only improves the sensitivity and reliability of temperature acquisition, but also enables uniform monitoring of temperature at different locations inside the cavity, avoiding excessively high or low local temperatures.

[0029] A multi-stage temperature control method for optical resonators is proposed. To reduce the preheating time of the multi-stage temperature control system for optical resonators, decrease system overshoot, and improve product experience, the system includes two heating modules: a first heating module 1 and a second heating module 2. The first heating module 1 is a high-power heating module, and the second heating module 2 is a low-power heating module. Assuming the system's set control temperature is T, refer to... Figure 3 As shown, the specific temperature control steps of the multi-stage temperature control method for optical resonant cavities are as follows:

[0030] 1) When the cavity temperature is below T-5, both the first heating module 1 and the second heating module 2 operate in maximum power mode;

[0031] 2) When the cavity temperature is between T-5 and T-1, the first heating module 1 is turned off, and the second heating module 2 exits the full power heating mode. ADRC (Active Disturbance Rejection Control) or PID (Proportional, Integral, Derivative) control methods are adopted. In this temperature range, the first control parameter 1 is used to reduce overshoot and shorten the system stabilization time while ensuring heating power.

[0032] 3) After the cavity temperature reaches T-1, ADRC (Active Disturbance Rejection Control) or PID (Proportional, Integral, Derivative) control method is adopted, and the second control parameter 2 is used. In order to ensure the accuracy of temperature control in this temperature range, the heating power can be appropriately reduced.

[0033] A three-channel heating mode is adopted, in which the first heating module, the second heating module, and the air bath heating system work together. The first heating module and the second heating module are responsible for rapid heating and fine adjustment, respectively, while the air bath heating system transfers heat to all parts of the cavity through uniform airflow to achieve uniform temperature distribution.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage temperature control and tuning system for an optical resonant cavity, characterized in that: It includes multiple temperature sensors connected in series and parallel. All temperature sensors are of the same type and can be equivalent to a single resistor in hardware. Only one temperature preprocessing and analog-to-digital conversion circuit is needed for signal acquisition.

2. The multi-stage temperature control and tuning system for optical resonant cavities according to claim 1, characterized in that: It includes four temperature sensors R1, R2, R3, and R4, where R1 and R2 are connected in parallel; R3 and R4 are connected in parallel, and Rx = R1 / / R2 + R3 / / R4.

3. The multi-stage temperature control and tuning system for optical resonant cavities according to claim 1, characterized in that: It includes four temperature sensors R1, R2, R3, and R4, where R1 and R2 are connected in series; R3 and R4 are connected in series, and Rx = (R1 + R2) / / (R3 + R4).

4. The multi-stage temperature control and tuning system for optical resonant cavities according to claim 1, characterized in that: It includes two heating modules: a first heating module and a second heating module. The first heating module is a high-power heating module, and the second heating module is a low-power heating module.

5. A multi-stage temperature control method for optical resonators, using the multi-stage temperature control system for optical resonators as described in any one of claims 1 to 4, characterized in that, Includes the following steps: Step 1: Set the control temperature to T in the system. When the cavity temperature is lower than T-5, both the first heating module and the second heating module will operate in maximum power mode. Step 2: When the cavity temperature is between T-5 and T-1, the first heating module is turned off, and the second heating module exits the full power heating mode. The active disturbance rejection control or PID control method is adopted. In this temperature range, the first control parameter is used to reduce overshoot and shorten the system stabilization time while ensuring heating power. Step 3: After the cavity temperature reaches T-1, adopt ADRC (Active Disturbance Rejection Control) or PID (Proportional, Integral, Derivative) control method and use the second control parameter. In order to ensure the accuracy of temperature control within this temperature range, the heating power can be appropriately reduced.

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