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OPT3001: OPT3001DNPR application problem

user5397585
Prodigy 110 points
Part Number: OPT3001
1. TI's OPT3001DNPR sensor has requirements for the angle of incidence of light, and mentions the selection and compensation of the material of the hood.

1.1 The larger the angle of incidence of light, the better? If the incident angle of light is only 20°, how much does it affect the accuracy of the sensor's detection of light?

1.2 When the light wavelength is 550nm, the material of the hood requires a light transmittance of less than 7%. If the light transmittance of the hood is greater than 40%, how much influence does the sensor have on the accuracy of the light detection (the hood has been opened and the light transmission is good)?
  • 0
    TI__Mastermind 49926 points
    Hello Xinxin,

    Thanks for the interest in the OPT3001 ALS devices.
    We have received your inquiry about the ALS sensor accuracy on the reduced angle of incidence and I will get back to you by mid next week.
  • 0
    TI__Prodigy 330 points
    Hi XinXin,

    1.1) OPT3001 device has a filter specifically for V-lambda characteristics. If the optics in front of the sensor restrict the angle of entry to 20 degree, the performance of the sensor is not expected to have a significant impact.

    1.2) As mentioned earlier OPT3001 has V-lamba curve as shown in first page of data sheet. If a transparent material is stacked up on top of the sensor with special ink, the spectral characteristics of the ink will affect the measurement. The lux/digial value reported by the OPT3001 device will be a function of the spectral characteristics of the ink (related to overall transmission in the the visible wavelength range). In some cases if the ink has a strong dependency on wavelength of light, the measurement could get affected by the type of light source used.

    thanks
    Karthik