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在我们研制的多路红外测温仪中,钽酸锂(LiTaO_3)元件探测到的辐射信号经闭路相敏检波锁相放大器取得的电压信号,含有环境温度影响.且与被测温度是非线性关系.过去使用电子线路进行环境温度补偿和线性补偿.在使用微机技术之后有很大的改进.首先是灵活性好.仪器的测温范围改变和扩大都非常方便(可以扩大量程至0～1000℃或更大);容易实现温度的自动控制;由采于用12位A/D转换.测温仪的分辩率和精度可以进一步改善;稳定性和可靠性都有很大的提高.
In the multi-channel infrared thermometer we developed, the voltage signal of the radiation signal detected by the LiTaO_3 device through the phase-sensitive phase-lock detection amplifier contains the influence of the ambient temperature, and it has a nonlinear relationship with the measured temperature In the past, electronic circuits were used for temperature compensation and linear compensation, which was greatly improved after the use of microcomputer technology. First of all, the flexibility was good. It is very convenient to change and expand the temperature range of the instrument (the range can be expanded to 0 to 1000 ° C Or more); easy to achieve automatic temperature control; by mining in the 12-bit A / D conversion. Thermometer resolution and accuracy can be further improved; stability and reliability have greatly improved.