关于一段英文翻译,学电子的进When subjected to heat flux, most systems (eve

关于一段英文翻译,学电子的进
When subjected to heat flux, most systems (even small ones) exhibit an impressive delay before their temperature begins to stabilize. The time needed to attain 63.2% of a given temperature gradient is called the thermal time constant, and it often ranges from 5 to 200 seconds. Thus, the time constants associated with temperature-regulator operation can seem very very long to an electronic engineer. The system discussed here has a thermal time constant of approximately 40s, which is slow indeed when compared with transients that are possible in the power supply voltage.
To enable a response to any variation of the power supply voltage, the design includes two parallel
feedback paths (Figure 2). One ceramic plate of the TEC is in close thermal contact with the object of interest (a laser diode in this case), and the other plate allows heat transfer to the external ambient temperature. This heat transfer should be as unimpeded as possible, and if necessary (when high power levels are encountered) it should be assisted with a blower. Because a certain level of continuous heat leakage is unavoidable, a corresponding amount of electric power is needed to compensate for the leakage at equilibrium.