Omron Z4M-T30V2 and Z4M-H30V Laser Displacement Measurement System

The Omron Z4M-T30V2 sensor head operating in conjunction with the Z4M-H30V amplifier unit constitutes a high-precision CCD laser displacement measurement system designed for non-contact dimensional gauging in industrial automation. This combined measurement system excels at detecting surface displacement, thickness variation, and position of both opaque and transparent objects where contact-based measurement methods are impractical due to delicate surfaces, high-speed motion, or cleanroom requirements. The Z4M-T30V2 sensor head projects a linear laser beam onto the target surface. Reflected light is received by a high-resolution CCD array within the sensor head, which determines the distance to the target by triangulation principles based on the position of the reflected spot on the CCD element. The Z4M-H30V amplifier unit processes the signal from the sensor head, converting raw position data into calibrated distance readings and provides comparison outputs.

Measurement Principle and Optics

The Z4M measurement system employs the regular reflection optical principle, in which the laser beam is reflected from the target surface at an angle equal to the angle of incidence. This configuration is effective for measuring smooth, glossy, or reflective surfaces including polished metals, glass, films, and coated materials where diffused reflection sensors produce insufficient signal. The Z4M-T30V2 sensor head incorporates a line beam optical system, projecting a linear beam pattern rather than a single spot. This line beam illuminates a sensing area of 900 millimeters in length with a beam thickness of 25 micrometers, averaging surface variations across the measurement region. The system detects the precise position of the laser line on the CCD array, converting this position into distance values with a resolution of 0.25 micrometers. The standard measurement distance is specified as 20 millimeters plus or minus 1 millimeter from the sensor head reference plane, providing a limited but high-resolution detection range optimized for close-proximity measurement of transparent bodies and reflective surfaces.

Sensor Head Construction and Mounting

The Z4M-T30V2 sensor head is constructed in a compact housing suitable for machine integration where space is limited. The laser emitter and CCD receiver are optically aligned at the factory and secured against misadjustment during normal operation. The housing includes mounting provision for securing the sensor to machine frames or brackets. A 0.5 meter cable with connector is permanently attached to the sensor head for interconnection with the Z4M-H30V amplifier unit. The sensor head meets Class 2 laser safety requirements for industrial environments, implementing engineering controls to limit accessible laser radiation to levels safe during normal operation. Optical windows protect the internal components while allowing laser emission and reception.

Amplifier Unit Processing and Output Functions

The Z4M-H30V amplifier unit provides the processing intelligence and output interface for the measurement system. The amplifier supplies regulated power to the sensor head and receives raw CCD image data for analysis. The internal signal processor locates the laser line position within the CCD image and converts this position into engineering units based on factory calibration data. The amplifier can be configured for various measurement modes including distance measurement, thickness measurement between two opposing sensors, and gap or step measurement across a single surface. Judgment outputs are generated by comparing the measured value against user-programmed high and low limits. Analog output options provide continuous signals linearly proportional to measured distance for integration with PLC analog input modules. The amplifier includes a digital panel display that shows measured values and programming menus for setting measurement parameters including measurement mode selection, averaging filter time constants, and limit values.

Typical Measurement Applications

The Z4M-T30V2 and Z4M-H30V system is optimized for measuring transparent bodies where standard diffuse reflection sensors fail to produce adequate return signals. Glass thickness measurement is a common application, where the laser beam reflects from both the front and rear surfaces of the glass, with the offset between reflections correlated to thickness. Transparent film and sheet measurement applications benefit from the system’s ability to detect the presence and position of transparent materials moving at production speeds. The system also measures displacement of glossy metal surfaces during grinding, polishing, or machining operations where contact gauges cannot be deployed. Semiconductor wafer positioning, liquid level detection on reflective surfaces, and precision alignment of optical components are additional applications benefiting from the measurement capabilities of this system.