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Why is it not allowed to switch on the sensor at <-10°C, if the extended temperature is going down to -30°C?
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This note is here to provide a comprehensive explanation regarding the restriction on activating the sensor below -10°C when the extended temperature range extends to -30°C.
The rationale behind this limitation is primarily associated with the sensor's sensitivity to temperature and the specific operational characteristics within the designated temperature range. The key concern stems from the substantial decrease in sending power that occurs when the sensor is activated in temperatures below -10°C.
Internally, the sensor incorporates a closed control loop system that continuously monitors and regulates the sending power of the laser diode. If the sending power falls below a certain threshold, the control loop responds by increasing the current supplied to the laser diode. While this corrective action is intended to maintain optimal performance, it poses a potential risk of damaging the sensor, specifically the laser diode, due to the elevated current.
Consequently, the decision to prohibit sensor activation below -10°C is a preventive measure to avoid the adverse effects of high current on the sensor components. By refraining from activating the sensor in temperatures below this threshold, users can ensure that the sending power remains within the safe operating range, mitigating the risk of self-inflicted damage to the laser diode.
It is noteworthy that activating the sensor above -10°C eliminates the risk of sending power loss. The sensor will function normally even in sub-zero temperatures, as the internal self-heating mechanism prevents the temperature from dropping to levels that could compromise the laser diode's integrity.
Keywords: laser, low temperature , ambient operating temperature
