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| """ 方向盘 NIR 血糖监测系统 集成在方向盘握持区域 """
import numpy as np from typing import Optional
class SteeringWheelNIR: """ 方向盘集成 NIR 血糖传感器 硬件: - NIR LED: 940nm + 1550nm 双波长 - 光电二极管: InGaAs - MCU: 车规级 ARM Cortex-M - 通信: CAN-FD 安装位置: 方向盘 3点/9点位 """ WAVELENGTHS = [940, 1550] CALIBRATION = { 'baseline_940': None, 'baseline_1550': None, 'slope': -0.052, 'intercept': 95.0 } def __init__(self): self.calibrated = False self.last_reading = None self.confidence = 0.0 self.contact_timer = 0 self.min_contact_time = 3.0 def read_glucose(self, nir_signal: np.ndarray) -> dict: """ 读取血糖 Args: nir_signal: (2, N) 双波长时序信号 Returns: { 'glucose': mg/dL, 'confidence': 0-1, 'status': 'normal'/'high'/'low'/'error' } """ if not self._check_contact(nir_signal): return {'glucose': None, 'confidence': 0, 'status': 'no_contact'} absorbance = self._calc_absorbance(nir_signal) ratio = absorbance[0] / (absorbance[1] + 1e-6) glucose = self.CALIBRATION['slope'] * ratio + self.CALIBRATION['intercept'] conf = self._calc_confidence(nir_signal, absorbance) self.confidence = conf if glucose < 70: status = 'low' elif glucose > 180: status = 'high' elif 70 <= glucose <= 180: status = 'normal' else: status = 'error' return { 'glucose': round(glucose, 1), 'confidence': round(conf, 3), 'status': status } def _check_contact(self, signal: np.ndarray) -> bool: """检查手掌是否有效接触传感器""" signal_strength = np.max(np.abs(signal)) return signal_strength > 0.5 def _calc_absorbance(self, signal: np.ndarray) -> np.ndarray: """计算吸光度 A = -log10(I/I0)""" if self.CALIBRATION['baseline_940'] is None: self.CALIBRATION['baseline_940'] = np.mean(signal[0]) self.CALIBRATION['baseline_1550'] = np.mean(signal[1]) self.calibrated = True absorbance = np.zeros(2) absorbance[0] = -np.log10( np.mean(signal[0]) / (self.CALIBRATION['baseline_940'] + 1e-6) + 1e-6 ) absorbance[1] = -np.log10( np.mean(signal[1]) / (self.CALIBRATION['baseline_1550'] + 1e-6) + 1e-6 ) return absorbance def _calc_confidence(self, signal, absorbance) -> float: """计算置信度""" snr = np.mean(np.abs(signal)) / (np.std(signal) + 1e-6) contact_quality = min(snr / 10, 1.0) return contact_quality * 0.8
if __name__ == "__main__": sensor = SteeringWheelNIR() np.random.seed(42) signal_940 = 0.8 + 0.02 * np.random.randn(100) signal_1550 = 0.6 + 0.02 * np.random.randn(100) nir_signal = np.array([signal_940, signal_1550]) result = sensor.read_glucose(nir_signal) print(f"Glucose: {result['glucose']} mg/dL") print(f"Confidence: {result['confidence']}") print(f"Status: {result['status']}")
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