Correction device, correction method, and distance measuring device
A correction device including a photon number counting unit that counts a photon number on the basis of an output signal output from a light receiving unit, a correction value acquiring unit that acquires a correction value corresponding to the photon number, and a correction unit that performs correction based on the correction value.
1. A correction device, comprising:
circuitry configured to:
count a photon number based on an output signal from a light receiving unit, wherein
the circuitry includes an integration circuit, and
the integration circuit is configured to count the photon number based on an integrated value of a peak voltage of the output signal;
acquire a temporal shift amount corresponding to the photon number, wherein the acquired temporal shift amount is with respect to a timing of the output signal; and
perform a correction process based on the acquired temporal shift amount.
2. The correction device according to claim 1 , wherein
the circuitry is further configured to count the photon number based on a time difference between a first timing at which a level of the output signal exceeds a first threshold value and a second timing at which the level of the output signal exceeds a second threshold value.
3. The correction device according to claim 1 , wherein
the circuitry is further configured to output a digital format photon number signal indicating the photon number.
4. The correction device according to claim 1 , wherein
the circuitry is further configured to refer to a lookup table to acquire a correction value corresponding to the photon number, and
the lookup table includes the correction value corresponding to the photon number.
5. The correction device according to claim 1 , wherein
the circuitry is further configured to correct one of a timing at which the light receiving unit receives light or a time of flight of the light, based on the acquired temporal shift amount.
6. The correction device according to claim 1 , wherein the circuitry is further
configured to measure a timing at which a level of the output signal exceeds a specific threshold value.
7. The correction device according to claim 1 , wherein the circuitry is further
configured to:
receive an output timing of light received by the light receiving unit; and
measure a difference between the output timing and a timing at which a level of the output signal exceeds a specific threshold value.
8. The correction device according to claim 1 , wherein a frequency distribution of one of a peak value or an integrated value of the output signal has a maximum value corresponding to the photon number.
9. The correction device according to claim 8 , wherein
the light receiving unit includes a plurality of light receiving elements connected together, and
each light receiving element of the plurality of light receiving elements includes an avalanche photodiode and a resistor connected in series to the avalanche photodiode.
10. The correction device according to claim 1 , further comprising the light receiving unit.
11. A correction method, comprising:
counting, by circuitry, a photon number based on an output signal from a light receiving unit, wherein the circuitry includes an integration circuit;
counting, by the integration circuit, the photon number based on an integrated value of a peak voltage of the output signal;
acquiring, by the circuitry, a temporal shift amount corresponding to the photon number, wherein the acquired temporal shift amount is with respect to a timing of the output signal; and
performing, by the circuitry, a correction process based on the acquired temporal shift amount.
12. A distance measuring device, comprising:
circuitry configured to:
count a photon number based on an output signal from a light receiving unit, wherein
the circuitry includes an integration circuit, and
the integration circuit is configured to count the photon number based on an integrated value of a peak voltage of the output signal;
acquire a temporal shift amount corresponding to the photon number, wherein the acquired temporal shift amount is with respect to a timing of the output signal;
perform a correction process based on the acquired temporal shift amount; and
calculate a distance to a distance measurement target based on a result of the correction process.
13. The distance measuring device according to claim 12 , wherein
the circuitry is further configured to correct one of a timing at which the light receiving unit receives light or a time of flight of the light, based on the acquired temporal shift amount.