Introduction to LD for dust (PM2.5, pollen, etc.) detection
Improves the detection accuracy of dust (PM2.5, only 2.5μm in size)
01
Problems (troubles) faced by customers
● Want to detect PM2.5 with high accuracy (LD with shorter wavelength has more advantages)
● Hope to use LD with high working temperature (usually 70℃)
● There are few products in the market that meet international standards in the automotive field
02
Reasons for adoption (Solution provided by ROHM)
● Excellent high temperature characteristics (guaranteed operating temperature 85°C) 650nm LD
● Extensive track record in the field of consumer electronics - air purifiers
● Meets AECQ102 standard
● Produced by a factory that has obtained IATF16949 (FAB: expected to obtain in March 2022, Assy: obtained in 2020)
03
The results and advantages of adoption
● Able to detect PM2.5, which helps to realize the in-car air purification system
04
Model
Improves the detection accuracy of dust (PM2.5, only 2.5μm in size)
01
Problems (troubles) faced by customers
● Want to detect PM2.5 with high accuracy (LD with shorter wavelength has more advantages)
● LD with excellent surge resistance and low damage is desired
02
Reasons for adoption (Solution provided by ROHM)
● 650nm LD with excellent high temperature characteristics
● Extensive track record in the field of consumer electronics - air purifiers
● Adopt ROHM's own structure to achieve high ESD
03
The results and advantages of adoption
● Improve the detection accuracy of PM2.5
● Improved surge resistance, making it easier for customers to handle LD
04
Model
Dust (PM2.5, pollen, etc.) detection light source
Use equipment such as an impactor to remove larger dust from the air sucked in from the inlet and introduce only particles smaller than 2.5μm into the detector.
Irradiate LD light and detect only the scattered light (diffuse reflected light) of PM2.5 particles
Determine PM2.5 particle quantity based on light sensitivity
When it is determined that the amount of PM2.5 particles is large, the suction of the pump body is increased to promote the removal of PM2.5
Reasons for using LD
● Only want to receive scattered light (direct light can be easily separated)
● Scattering points can be illuminated by high-density light (high S/N)
● The original light intensity is easy to stabilize (can be driven by APC)
● Narrow beam width (stable signal)
Recommended Products
RLD65NZX1: Comparison of temperature dependence of current vs light output characteristics
√RLD65NZX1 has better temperature characteristics than other companies
RLD65NZX1: Comparison of COD and ESD levels
√ COD and ESD levels are higher than other companies
※The information in this document is as of February 15, 2021
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