Thomas Ales [M S E]
297 lines
7.8 KiB
Python
297 lines
7.8 KiB
Python
"""
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Helios Laser System Driver
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Basic implementation for controlling the Helios pulsed laser.
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"""
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import serial
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import time
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import logging
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from typing import Optional, List
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from enum import Enum
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logger = logging.getLogger(__name__)
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class PulseMode(Enum):
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"""Helios pulse mode enumeration"""
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SINGLE_PULSE = 0
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CONTINUOUS_GATING = 1
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CONTINUOUS_PULSING = 2
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class HeliosLaser:
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"""
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Driver for Helios pulsed laser system.
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Communication: RS-232, 9600 baud, 8N1
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Commands are ASCII strings terminated with CR
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"""
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def __init__(self, port: str = None, timeout: float = 1.0):
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"""
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Initialize Helios laser driver.
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Args:
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port: Serial port (e.g., '/dev/ttyUSB0' or 'COM5')
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timeout: Serial timeout in seconds
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"""
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self.port = port
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self.timeout = timeout
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self.serial = None
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self.is_connected = False
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@staticmethod
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def list_available_ports() -> List[str]:
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"""List available serial ports"""
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import serial.tools.list_ports
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ports = serial.tools.list_ports.comports()
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return [port.device for port in ports]
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def connect(self, port: str = None) -> bool:
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"""
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Connect to the Helios laser.
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Args:
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port: Serial port (uses stored port if None)
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Returns:
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True if connection successful
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"""
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if port:
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self.port = port
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if not self.port:
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logger.error("No port specified")
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return False
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try:
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self.serial = serial.Serial(
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port=self.port,
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baudrate=9600,
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bytesize=serial.EIGHTBITS,
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parity=serial.PARITY_NONE,
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stopbits=serial.STOPBITS_ONE,
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timeout=self.timeout
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)
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time.sleep(0.1) # Allow time for connection to stabilize
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self.is_connected = True
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logger.info(f"Connected to Helios laser on {self.port}")
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return True
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except Exception as e:
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logger.error(f"Failed to connect to Helios laser: {e}")
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self.is_connected = False
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return False
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def disconnect(self):
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"""Disconnect from the laser"""
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if self.serial and self.serial.is_open:
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try:
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# Disable laser before disconnecting
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self.set_laser_enable(False)
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self.serial.close()
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logger.info("Disconnected from Helios laser")
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except Exception as e:
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logger.error(f"Error during disconnect: {e}")
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self.is_connected = False
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self.serial = None
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def _send_command(self, command: str) -> bool:
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"""
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Send a command to the laser.
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Args:
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command: ASCII command string (without CR)
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Returns:
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True if sent successfully
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"""
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if not self.is_connected or not self.serial:
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logger.error("Not connected to laser")
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return False
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try:
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cmd_bytes = (command + '\r').encode('ascii')
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self.serial.write(cmd_bytes)
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logger.debug(f"Sent command: {command}")
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return True
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except Exception as e:
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logger.error(f"Failed to send command '{command}': {e}")
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return False
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def _query(self, command: str) -> Optional[str]:
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"""
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Send a query and read response.
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Args:
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command: ASCII query command (without CR)
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Returns:
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Response string or None if error
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"""
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if not self._send_command(command):
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return None
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try:
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response = self.serial.readline().decode('ascii').strip()
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logger.debug(f"Query '{command}' response: {response}")
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return response
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except Exception as e:
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logger.error(f"Failed to read response for '{command}': {e}")
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return None
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def set_frequency_hz(self, frequency: int) -> bool:
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"""
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Set laser pulse frequency in Hz.
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Args:
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frequency: Frequency in Hz (16700 - 125000)
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Returns:
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True if successful
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"""
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if not (16700 <= frequency <= 125000):
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logger.error(f"Frequency {frequency} Hz out of range (16700-125000)")
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return False
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# Convert frequency to period in nanoseconds
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period_ns = int(1e9 / frequency)
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command = f"FP={period_ns}"
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return self._send_command(command)
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def set_current_ma(self, current: int) -> bool:
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"""
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Set pump diode current in mA.
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Args:
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current: Current in mA (0 - 7000)
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Returns:
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True if successful
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"""
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if not (0 <= current <= 7000):
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logger.error(f"Current {current} mA out of range (0-7000)")
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return False
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command = f"PC={current}"
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return self._send_command(command)
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def set_pulse_mode(self, mode: PulseMode) -> bool:
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"""
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Set pulse mode.
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Args:
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mode: PulseMode enumeration value
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Returns:
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True if successful
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"""
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command = f"PM={mode.value}"
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return self._send_command(command)
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def set_laser_enable(self, enable: bool) -> bool:
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"""
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Enable or disable laser emission.
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Args:
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enable: True to enable, False to disable
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Returns:
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True if successful
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"""
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command = f"LE={1 if enable else 0}"
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success = self._send_command(command)
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if success:
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state = "enabled" if enable else "disabled"
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logger.info(f"Laser {state}")
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return success
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def is_laser_enabled(self) -> bool:
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"""
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Check if laser is currently enabled.
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Returns:
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True if laser is enabled
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"""
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response = self._query("LE?")
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if response:
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try:
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return int(response) == 1
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except ValueError:
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logger.error(f"Invalid response for LE?: {response}")
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return False
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def get_frequency_hz(self) -> Optional[int]:
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"""
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Get current laser frequency in Hz.
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Returns:
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Frequency in Hz or None if error
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"""
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response = self._query("FP?")
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if response:
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try:
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period_ns = int(response)
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return int(1e9 / period_ns)
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except (ValueError, ZeroDivisionError):
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logger.error(f"Invalid response for FP?: {response}")
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return None
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def get_current_ma(self) -> Optional[int]:
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"""
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Get current pump diode current in mA.
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Returns:
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Current in mA or None if error
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"""
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response = self._query("PC?")
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if response:
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try:
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return int(response)
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except ValueError:
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logger.error(f"Invalid response for PC?: {response}")
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return None
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def get_power_mw(self) -> Optional[float]:
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"""
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Get laser output power in mW.
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Returns:
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Power in mW or None if error
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"""
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response = self._query("PO?")
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if response:
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try:
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return float(response)
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except ValueError:
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logger.error(f"Invalid response for PO?: {response}")
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return None
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def get_controller_serial(self) -> Optional[str]:
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"""
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Get controller serial number.
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Returns:
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Serial number string or None if error
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"""
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return self._query("SN?")
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def get_head_serial(self) -> Optional[str]:
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"""
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Get laser head serial number.
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Returns:
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Serial number string or None if error
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"""
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return self._query("HSN?")
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def __del__(self):
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"""Destructor - ensure cleanup"""
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self.disconnect()
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