Systems and methods for photodiode-based detection
A photodiode-based detection module may include at least one photodiode for detecting light. The photodiode-based detection module may also include a sensitivity damper configured to temporarily reduce the sensitivity of the at least one photodiode. The photodiode-based detection module may further include a controller configured to trigger the sensitivity damper to reduce a sensitivity of the at least one photodiode to less than a nominal sensitivity threshold.
1. A photodiode-based detection module, the photodiode-based detection module comprising:
at least one photodiode configured to detect light;
a sensitivity damper configured to temporarily reduce the sensitivity of the at least one photodiode, the sensitivity damper comprising a light source whose light is detectable by the at least one photodiode; and
a controller configured to trigger the light source of the sensitivity damper to direct light to the at least one photodiode to reduce a sensitivity of the at least one photodiode to less than a nominal sensitivity threshold.
2. The photodiode-based detection module of claim 1 , wherein the at least one photodiode is configured to detect reflections of a light pulse from a field of view of a LIDAR system.
3. The photodiode-based detection module of claim 1 , wherein the at least one photodiode has a recovery duration between a light detection event and a resumption of operational sensitivity.
4. The photodiode-based detection module of claim 2 , wherein the photodiode-based detection module is a silicon photomultiplier (SiPM).
5. The photodiode-based detection module of claim 2 , wherein the at least one photodiode includes a single-photon avalanche diode (SPAD).
6. The photodiode-based detection module of claim 5 , wherein the SPAD has a recovery time of between 5 nanoseconds and 100 nanoseconds.
7. The photodiode-based detection module of claim 1 , wherein the light source includes a light-emitting diode (LED).
8. The photodiode-based detection module of claim 7 , wherein the LED emits light having a wavelength in a range of 760 to 960 nm.
9. The photodiode-based detection module of claim 1 , wherein the light source includes a laser.
10. The photodiode-based detection module of claim 2 , wherein light emitted by the light source has the same intensity level as the light pulse.
11. The photodiode-based detection module of claim 2 , wherein light emitted by the light source has an intensity level lower than that of the light pulse.
12. The photodiode-based detection module of claim 2 , wherein light emitted by the light source has an intensity level greater than that of the light pulse.
13. The photodiode-based detection module of claim 2 , wherein light emitted by the light source has the same wavelength as the light pulse.
14. The photodiode-based detection module of claim 2 , wherein light emitted by the light source has a wavelength different from that of the light pulse.
15. The photodiode-based detection module of claim 1 , wherein the sensitivity damper comprises an electric circuit for reducing a voltage level of the at least one photodiode.
16. The photodiode-based detection module of claim 15 , wherein reducing the voltage comprises reducing the voltage to a voltage value equal to or lower than a breakdown voltage of the at least one photodiode.
17. The photodiode-based detection module of claim 15 , wherein reducing the voltage comprises reducing the voltage by at least half of a difference between an operational voltage and a breakdown voltage of the at least one photodiode.
18. The photodiode-based detection module of claim 1 , wherein the sensitivity damper comprises an electric circuit for shutting down the at least one photodiode.
19. The photodiode-based detection module of claim 15 , wherein reducing the voltage comprises reducing the voltage to a voltage value equal to or lower than a threshold voltage.
20. The photodiode-based detection module of claim 19 , wherein the threshold voltage is 20 V.
21. The photodiode-based detection module of claim 1 , wherein reducing the sensitivity of the at least one photodiode comprises causing the at least one photodiode to avalanche.
22. The photodiode-based detection module of claim 21 , wherein the at least one photodiode is in a recovery time when the light pulse is emitted to the field of view.
23. The photodiode-based detection module of claim 1 , wherein the controller is further configured to receive timing information representing a time duration for the light pulse to be emitted to the field of view.
24. The photodiode-based detection module of claim 23 , wherein the controller is further configured to trigger the sensitivity damper to reduce the sensitivity of the at least one photodiode based on the received timing information.
25. The photodiode-based detection module of claim 1 , wherein the reduced sensitivity is equal to or lower than 20% of the nominal sensitivity threshold.
26. The photodiode-based detection module of claim 1 , wherein the reduced sensitivity is equal to or lower than 10% of the nominal sensitivity threshold.
27. The photodiode-based detection module of claim 1 , wherein the reduced sensitivity is equal to or lower than 5% of the nominal sensitivity threshold.
28. The photodiode-based detection module of claim 1 , wherein the reduced sensitivity is equal to or lower than 1% of the nominal sensitivity threshold.
29. The photodiode-based detection module of claim 1 , wherein the reduced sensitivity is two orders of magnitude lower than the nominal sensitivity threshold.
30. The photodiode-based detection module of claim 1 , wherein reducing the sensitivity of the at least one photodiode to less than the nominal sensitivity threshold comprises reducing the sensitivity of the at least one photodiode to less than the nominal sensitivity threshold before the light pulse is emitted to the field of view.
31. An electrooptical system, comprising:
at least one photodiode configured to detect light;
a sensitivity damper configured to temporarily reduce the sensitivity of the at least one photodiode, the sensitivity damper comprising a light source whose light is detectable by the at least one photodiode; and
a controller configured to trigger the light source of the sensitivity damper to direct light to the at least one photodiode to reduce a sensitivity of the at least one photodiode to less than a nominal sensitivity threshold.
32. A method for controlling at least one photodiode of an electrooptical system, comprising:
reducing a sensitivity of the at least one photodiode to less than a nominal sensitivity threshold by triggering a light source to direct light to the at least one photodiode; and
detecting, by the at least one photodiode, reflections of a light pulse from a field of view of the electrooptical system.