OPT3001EVM: Test Method of Sensor Directivity

Hi Shinichi,

1) Are you referring to the plot "Figure 13. Normalized Response vs Illuminance Angle" in the datasheet? This is run using a white LED light source. You should see this note at the top of this page of the datasheet.

2) Could you please give some more details here on how to replicate this issues? Can you give the data you measure over time showing the value rising?

Best,

Alex

Hi Alex,

Thank you for your reply.

1) I share this information with the customer.

2) I am confirming the customer.
If I obtain the information, I'll feedback to you.

I appreciate your great help.

Best regards,
Shinichi

Hi Alex,

I could obtain the customer's situation.

And he has an additional question.

Could you please advise.

---

1) I understand LED is used.

Do you use the white LED light with doing nothing?

Is it using a lens to create collimated light?

2)Please see attached file.

When I measure with OPT3001EVM,

the phenomenon that the measured value rises rapidly occurs.

Next, when I touch the laptop, the reading drops sharply, and when I stop touching it,

I return to the previous rising value and continue rising again.

The state is unstable.

I assume that the light from the laser diode is bad,

Could you please tell me about why this phenomenon occurs.

OPT3001 measurement block.pptx

---

I appreciate your great help.

Best regards,

Shinichi

Hi Shinichi,

1) The LED light is collimated. It is not just a bare LED.

2) The readings on the y-axis of your graph are in lux? The value appears to be oscillating between 65 and 72 lux. This means attenuation by the board much more than 1/7.

If the light source is not stable then this variation is possible, but I am not sure the details on the light source. The laser diode could be heating over time and this could change the intensity of the light and show the drift you are seeing.

When you say you touch the laptop is this moving the OPT3001? Mechanical movement to the device would cause a change in reading. Can you share a picture of the test setup?

Best,

Alex

HI Alex,

Thank you for your reply.

I'll share your suggestion with the customer.

If I get a response, I consult you again.

I appreciate your great help.

Best regards,

Shinichi

Hi Alex,

I sent your answer to the customer yesterday.

I'd like to wait the customer's response.

Could you please wait for a couple of days to close.

I appreciate your great help.

Best regards,
Shinichi