54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
"""Constants for the laser control module.
|
||
|
||
Physical constraints, protocol parameters, and operational limits for the
|
||
laser control board.
|
||
"""
|
||
|
||
# ---- Protocol constants
|
||
|
||
BAUDRATE = 115200
|
||
SERIAL_TIMEOUT_SEC = 1.0
|
||
|
||
WAIT_AFTER_SEND_SEC = 0.15 # delay after sending a command
|
||
|
||
# ---- Physical / hardware constants (from device_conversion.py)
|
||
|
||
VREF = 2.5 # Reference voltage, Volts
|
||
|
||
# Bridge resistors for temperature measurement
|
||
R1 = 10000 # Ohm
|
||
R3 = 27000 # Ohm
|
||
R4 = 30000 # Ohm
|
||
R5 = 27000 # Ohm
|
||
R6 = 56000 # Ohm
|
||
|
||
RREF = 10 # Current-setting resistor, Ohm
|
||
# (@1550 nm – 28.7 Ohm; @840 nm – 10 Ohm)
|
||
|
||
# Thermistor Steinhart–Hart B-coefficient
|
||
BETA_INTERNAL = 3900 # K
|
||
T0_K = 298 # Kelvin (25 °C reference)
|
||
R0 = 10000 # Ohm (thermistor nominal at 25 °C)
|
||
|
||
# DAC resolution
|
||
ADC_BITS_16 = 65535 # 2^16 - 1
|
||
|
||
# ---- Operational limits (validated in validators.py)
|
||
|
||
TEMP_MIN_C = 15.0 # Minimum allowed laser temperature, °C
|
||
TEMP_MAX_C = 40.0 # Maximum allowed laser temperature, °C
|
||
|
||
CURRENT_MIN_MA = 15.0 # Minimum allowed laser current, mA
|
||
CURRENT_MAX_MA = 60.0 # Maximum allowed laser current, mA
|
||
|
||
# Variation step limits
|
||
CURRENT_STEP_MIN_MA = 0.002 # Minimum current variation step, mA
|
||
CURRENT_STEP_MAX_MA = 0.5 # Maximum current variation step, mA
|
||
|
||
# Time parameter limits
|
||
TIME_STEP_MIN_US = 20 # Minimum time step, microseconds
|
||
TIME_STEP_MAX_US = 100 # Maximum time step, microseconds
|
||
|
||
DELAY_TIME_MIN_MS = 3 # Minimum delay between pulses, milliseconds
|
||
DELAY_TIME_MAX_MS = 10 # Maximum delay between pulses, milliseconds
|