2D Optical micrometers are designed for non-contact inline two-dimensional batch measurements of linear dimensions, diameters, angles, thread parameters, part shapes, run-out, etc.
Optical micrometers use a “shadow” measurement principle whereby collimated laser light is transmitted towards a receiver.
The edges of the shadow cast by an object in the beam’s path are accurately measured by the detector array inside the receiver unit.

RF656.2D Series
Measurement ranges, mm
8х10, 25х30, 30х40, 40х50
Accuracy, um
±1.5 ...±4.5
Rate, measurement/s
130
Technical characteristics of optical sensors depending on their model:
RF656.2D | -8x10 | -25x30 | -30x40 | -40x50 | |||||||
Measuring range, mm | 8x10 | 25x30 | 30x40 | 40x50 | |||||||
Measurement error, µm | ±1.5 | ±2.5 | ±3 | ±4.5 | |||||||
Distance along the axis at which the measurement error is applied, mm |
±1 | ±3 | ±3 | ±4 | |||||||
Minimum object size, mm | 0.07 | 0.2 | 0.25 | 0.35 | |||||||
Speed, measurements/s | up to 130 | ||||||||||
Overall dimensions, figure | 1 | 2 | 3 | 4 | |||||||
Weight, not more, kg | 1.1 | 2.3 | 2.8 | 5.6 |
General technical characteristics of RF656.2D optical sensors:
Interface | |||||||||||
Basic interface | Ethernet / 1000 Mbps | ||||||||||
Synchronization inputs | 1 channel | ||||||||||
Logic outputs | 2 channels (1 channel is used as a strobe of active exposure) | ||||||||||
Power supply, V | 12...24 | ||||||||||
Power consumption, not more, W | 6 | ||||||||||
Environmental resistance | |||||||||||
Environmental resistance | IP62 | ||||||||||
Vibration | 20 g / 10…1000 Hz, 6 hours for each of XYZ axes | ||||||||||
Shock | 30 g / 6 ms | ||||||||||
Operating ambient temperature, °С | -10…+50 | ||||||||||
Storage temperature, °С | -20…+80 | ||||||||||
Relative humidity, % | 20-80 (no condensation) | ||||||||||
Housing/windows material | aluminum/glass |
Technical characteristics of RF656.2D-SuM controllers:
Controller version | HW1 | HW2 | |||||||||
Speed, measurements/s | 30 | 50 | |||||||||
Interface | |||||||||||
Ethernet | 3 x GbE, RJ-45 connectors | ||||||||||
COM port |
4 x RS-232/422/485, DB-9 connectors. Changing the interface type can be done in the BIOS. 2 x RS-232, RJ-45 connectors |
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USB |
4 x USB 3.2 Gen 2 (10 Gb/s) 2 x USB 2.0 |
6 x USB 3.2 Gen 2 (10 Gb/s) | |||||||||
Display |
1 x HDMI 1 x DisplayPort |
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Power | |||||||||||
Power supply, V | 12..24 | ||||||||||
Power consumption, not more, W | 60 | ||||||||||
Standard | AT/ATX, switchable | ||||||||||
Environmental resistance | |||||||||||
Operating ambient temperature, °С | -20…+60 | ||||||||||
Storage temperature, °С | -40…+85 | ||||||||||
Permissible relative humidity during use, % | 10-95 (no condensation) | ||||||||||
Permissible relative humidity during storage, % при хранении, % | 10-95 (no condensation) | ||||||||||
Shock |
5G/11ms half-sine shock, 100 shocks for each of XYZ axes, IEC68-2-27 |
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Vibration | MIL-STD-810G 514.6C-1 (SSD) | ||||||||||
Weight, kg | 2.9 | ||||||||||
Overall dimensions, mm | 81 x 150 x 190 |

Figure 1. RF656.2D-8x10

Figure 2. RF656.2D-25x30

Figure 3. RF656.2D-30x40

Figure 4. RF656.2D-40x50
Structure and operating principle
The operation of the micrometer is based on the so-called "shadow" principle.
The main components of the 2D micrometer are an optical sensor and a controller.

The optical sensor of the micrometer consists of two parts - the emitter and the
receiver. The light from the LED is collimated by the lens. When a product is placed in the
region of a collimated beam, its shadow image is projected by the receiver lens onto the 2D
CMOS sensor. According to the location of the shadow border of the image (object profile),
the controller calculates the required parameters of the object.

Measurements and tolerance control are made according to the algorithm created
by the user. To build the measurement algorithm, a simple and visual tool is proposed - the
measurement scheme. The scheme is formed from a library of ready-made blocks. Various
combinations of blocks and connections between them allow the user to create an almost
unlimited number of measuring functions and measure products of varying complexity.
Measurement results can be transmitted via various protocols (Ethernet/IP, Modbus TCP,
UDP), as well as to the logical outputs of the micrometer for controlling actuators and
signaling the suitability of the product.
2D Optical Micrometers. RF656.2D Series.
2D Optical micrometer. Example of the formation of the measurement algorithm.
Order information for 1D Optical Micrometer RF656.2D
RF656.2D-R-LP-LS-LI-HW
Symbol | Description |
R |
Measuring range of the optical sensor. The following options are available (height x width, mm): . · 8x10, · 25x30, · 30x40, · 40x50. |
LP | The length of the controller power cable, m. |
LS | The length of the power and sync cable of the optical sensor, m. |
LI | The length of the Ethernet cable, m (max. 100). |
HW |
Controller type: · HW1 - controller with a speed of 30 measurements/s, · HW2 - controller with a speed of 50 measurements/s. |
Example: RF656.2D-40x50-3-3-10-HW1 - optical sensor with measuring range 40x50 mm, controller power cable length 3 m, optical sensor power cable length 3 m, Ethernet cable length 10 m, controller with a speed of 30 measurements/s.
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