1.3.7. Measurement sequence

A basic possible measurement flow is given in Figure 16:

■ Execute a distance measurement and check the validity and quality of the signals. If action is needed, act accordingly.

■ If the camera operates in an ambient-light changing condition, occasionally read the ambient-light for quality check and compensation.

■ In thermally changing conditions, occasionally read the temperature for compensation.

■ Calculate, based on the correction data, the final distance value – or whatever is needed.

MEASUREMENT

distance

READ

pixel status

validity?

decrease

integration time

increase

integration time

sat. pixel > max. limit (e.g. 5)

all other

validity?

valid pixel < min. limit (e.g. 60)

READ

Q-subsample QSx

Calculate

mod. amplitude A

AC

quality?

A

A

all other

Calculate ratio AMR

ambient to mod. light

quality?

AMR > 60 dB (or >70dB)

all other

READ

temperature

optional, e.g. once per second

Calculate

corrected distance

continue?

no

quality?

END

measurement

A

AC

< 100 LSB

all other

yes

START

measurement

optional

MEASUREMENT

ambient-light

No object ?

Figure 16: Principle measurement flow

This flow is not only for detecting objects: It is also possible to observe and track the object (once captured).

© 2014 ESPROS Photonics Corporation

Characteristics subject to change without notice

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Datasheet epc600 - V1.3

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