The assumption of constant relative humidity is important, because water vapor in the atmosphere is another efficient absorber of radiation at infrared wavelength.

相对湿度恒定的假设是重要的，因为大气中的水蒸气是红外波长辐射的另一种有效吸收剂。

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Constant current driving and constant temperature controlling techniques are adopted on DFBLD to make the central wavelength of it accurately point at detected gas absorption.

本文通过对DFBLD光源采取恒流驱动和恒温控制技术，使DFBLD光源的中心波长精确对准被测气体吸收峰。

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The frequency of DFB LD was driven and controlled through such technology as constant current, temperature control in active area, wavelength lock and etc.

该方案通过采用恒流源、有源区温度控制以及波长锁定等技术方法来实现DFB LD的稳频驱动及控制。

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