An improved temperature compensation circuit for SLD light source of fiber-optic gyroscope

Chen, Xian; Yang, Jianhua; Zhou, Yilan; Shu, Xiaowu

doi:10.1088/1742-6596/916/1/012027

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…In reference [1], under the condition of constant temperature control, the output current is dynamically adjusted according to the power feedback of PIN-FET to keep its light source output power constant (variable current adjustment). Literature [2] adopts the digital control method, and directly uses two chips to control the current and temperature respectively, so as to keep the light power of the light source constant. References [3] and [4] have studied the SLD driving circuit and explored the influence of errors on light source characteristics.…”

Section: Forewordmentioning

confidence: 99%

“…References [3] and [4] have studied the SLD driving circuit and explored the influence of errors on light source characteristics. Literature [5] and [6] have made in-depth discussion and research on how to build a reliable and fast response temperature control circuit and used PID algorithm for control compensation. Literature [7] puts forward a method of setting PID parameters and constructs Fuzzy PID controller, which greatly improves the stability of light source.…”

Section: Forewordmentioning

confidence: 99%

“…When a continuous driving current is applied to the SLD, the temperature in the active area of the SLD will rise due to the internal thermal effect, which will lead to a red shift in the output wavelength of the SLD [10]. The change of the output wavelength of the SLD with temperature can be approximately expressed by the following formula (1) [9]: In which 'h' is Planck constant; 'C' is the speed of light in vacuum; 'Eg' is the band gap of semiconductor materials used in SLD active Region.…”

Section: Mechanism and Characteristics Of Sld Light Sourcementioning

confidence: 99%

“…The change of the output wavelength of the SLD with temperature can be approximately expressed by the following formula (1) [9]: In which 'h' is Planck constant; 'C' is the speed of light in vacuum; 'Eg' is the band gap of semiconductor materials used in SLD active Region. Generally speaking, 'Eg' changes with temperature, as shown in formula (2).…”

Section: Mechanism and Characteristics Of Sld Light Sourcementioning

confidence: 99%

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Simulation Study on Digital Control Model of Fiber Optic Gyro SLD Light Source

Zhao

2023

J. Phys.: Conf. Ser.

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Fiber Optic Gyroscope is an angular velocity sensitive device based on Sagnac effect. Super Luminescent Diode (SLD) is a widely used light source in fiber optic gyroscope, and its characteristics will directly affect the overall performance of gyroscope. In this paper, the working mechanism of SLD light source is studied, and the photoelectric characteristics of SLD light source and the influence of light source temperature and driving current on center wavelength are analyzed. According to the relationship between the central wavelength of the light source and the driving current and die temperature, a three-dimensional model of the central wavelength of the light source is obtained. In order to control the driving current and die temperature quickly and stably, the fuzzy PID control scheme of die temperature and incremental PID control scheme of driving current are studied and designed. Based on the three-dimensional model of the center wavelength of light source, the center wavelength of SLD light source is controlled stably and quickly.

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Section: Forewordmentioning

confidence: 99%

Section: Forewordmentioning

confidence: 99%

Section: Mechanism and Characteristics Of Sld Light Sourcementioning

confidence: 99%

Section: Mechanism and Characteristics Of Sld Light Sourcementioning

confidence: 99%

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Simulation Study on Digital Control Model of Fiber Optic Gyro SLD Light Source

Zhao

2023

J. Phys.: Conf. Ser.

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“…In a closed-loop IFOG configuration, demodulation of the rotational signal is usually achieved using the difference between the superluminescent diode (SLD) powers of the first and second half-cycles. The performance of the fiber-optic gyroscope is therefore directly related to the stability of the light source [ 9 , 10 , 11 ]. In order to improve SLD stability, researchers have carried out a great deal of work, and many good, practical results have been achieved.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Compensation for SLD Light-Power Fluctuation in an Interferometric Fiber-Optic Gyroscope

Zheng

Ren

Luo

et al. 2023

Sensors

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An interferometric fiber-optic gyroscope (IFOG) demodulates a rotation signal via interferometric light intensity. However, the working environments of IFOGs typically involve great uncertainty. Fluctuations in temperature, air pressure, electromagnetic field, and the power system all cause the power of the superluminescent diode (SLD) light source to fluctuate as well. In this invited paper, we studied the effects of SLD power fluctuation on the dynamic and static performance characteristics of a gyro system through the use of a light-power feedback loop. Fluctuations of 0.5 mA, 1 mA, and 5 mA in the SLD source entering the IFOG caused zero-bias stability to be 69, 135, and 679 times worse. We established an effective method to monitor power fluctuations of SLD light sources and to compensate for their effects without increasing hardware complexity or system cost. In brief, we established a real-time power-sensing and -compensating system. Experimental results showed that for every 0.1 mA increase in the fluctuation amplitude of the driving current, the zero-bias stability became 4 to 7 times worse, which could be reduced about 95% through the use of SLD power compensation.

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