New Japan Radio sensors measure pulse rate and blood oxygen levels
August 23, 2016
New Japan Radio has launched two reflective optoelectronic sensors to help wearable devices measure pulse rate and blood oxygen levels.
Using these sensors should improve the matching with the analogue front end (AFE) IC in wearable devices with bio-monitoring functions, making the overall design simpler and easier.
A wearable device with bio-monitoring functions is generally connected with the AFE IC to process the detected signal. Several mainstream AFE ICs are widely used in the market. The Tokyo-based company has developed two optoelectronic sensors for wearable fitness and healthcare monitoring devices, and improved the matching with the mainstream AFE ICs.
One sensor – NJL5311R – is for measuring pulse rate, and the other – NJL5513R – is for measuring pulse rate and SpO2.
Both inherit reflective type as well as the previous optoelectronic sensors that let wearable devices more easily measure bio-monitoring signals. The NJL5311R embeds an optical filter that can reduce the environmental light interference in the light-receiving device.
The NJL5513R integrates one red LED, one infra-red LED and two green LEDs in one package and is for measuring pulse rate and SpO2.
“When we designed both sensors, we have taken into account smart band application,” said a New Japan Radio spokesperson. “We selected the best in LED type, brightness and configuration of the light receiving device.”
The NJL5311R is a standard sensor for overseas chipset vendors. The NJL5513R is a recommended sensor that is compatible with the ApP Lite TZ1000 series from Toshiba. The TZ1000 is a wearable terminal processor with Bluetooth Low Energy low-power communications, acceleration sensor and flash memory.
The NJL5311R is an SMD type reflective optoelectronic sensor that integrates two high brightness green LEDs and a high sensitive Si-PIN photodiode with optical filter in one package. Two equipped LEDs can contribute to the stability of the receiving optical signal. It embeds an optical filter in the photodiode, which can reduce the environmental light interference and accurately measure pulse rate. It measures 3.15 by 4.35 by 0.8mm.
The NJL5513R is also an SMD type reflective optoelectronic sensor. It integrates two high brightness green LEDs, one red LED and one infra-red LED, three kinds of light emitting devices, and high sensitive Si-PIN photodiode light receiving device in one package. It measures 3.2 by 5.0 by 0.65mm.