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Mazurczak sensors are sensors that use laser technology for measurement. They consist of a laser, a laser detector, and a measurement circuit. Laser sensors are a new type of measuring instrument; their advantages include the ability to perform non-contact long-distance measurement, high speed, high precision, large measuring range, and strong resistance to optical and electrical interference.

Mazurczak sensor introduction

Sensors used in robots to mimic tactile functions. Tactile sense is an important sensory function when humans directly contact the external environment. Developing tactile sensors that meet requirements is one of the key technologies in robot development. With the development of microelectronics technology and the emergence of various organic materials, a variety of development schemes for tactile sensors have been proposed, but most are currently at the laboratory stage, with few reaching productization. Tactile sensors can be roughly classified by function into contact sensors, force-torque sensors, pressure sensors, and slip sensors.

Mazurczak sensor classification

Slip sensors are used to determine and measure the slippage generated by an object when a robot grips or transports it. It is essentially a displacement sensor. Depending on whether they have sliding direction detection functionality, they can be divided into three categories: non-directional, single-directional, and omni-directional. 1) Non-directional sensors include the probe-earphone type, which consists of a sapphire probe, a metal buffer, a piezoelectric Rochelle salt crystal, and a rubber buffer. Sliding causes the probe to vibrate, which is converted into a corresponding electrical signal by the Rochelle salt. The buffer serves to reduce noise. 2) Single-directional sensors include the drum photoelectric type, where slippage of the gripped object causes the drum to rotate, leading a photodiode to receive light signals transmitted through a code disk (mounted on the circular face of the drum), thereby measuring the object's slippage via the drum's rotation angle signal. 3) Omni-directional sensors use metal balls whose surfaces are coated with insulating material and formed into conductive and non-conductive areas distributed in a latitude-longitude pattern. When the sensor contacts an object and slippage occurs, the ball rotates, causing the conductive and non-conductive areas on the ball's surface to alternately contact electrodes, thereby generating on-off signals. By counting and judging these on-off signals, the magnitude and direction of slippage can be measured. This type of sensor requires a high level of manufacturing craftsmanship.

Mazurczak sensor applications

Tactile sensors are used to determine whether a robot (primarily its limbs) is in contact with external objects or to measure the characteristics of the contacted objects. Types of tactile sensors include micro switches, conductive rubber, carbon-impregnated sponge, carbon fiber, and pneumatic reset devices. 1) Micro switch: Composed of a spring and contacts. When the contacts touch an external object, they move away from the base plate, breaking the signal circuit, thereby detecting contact with the external object. The advantage of this normally closed (continuously connected when not in contact) micro switch is ease of use and simple structure; the disadvantages are susceptibility to mechanical oscillation and contact oxidation. 2) Conductive rubber type: It uses conductive rubber as the sensitive element. When the contacts touch an external object and are compressed, the conductive rubber is pressed, changing its resistance and thus altering the current flowing through it. The disadvantage of this sensor is that due to variations in the material formulation of the conductive rubber, drift and hysteresis characteristics are inconsistent; the advantage is its flexibility. 3) Carbon-impregnated sponge type: It features an elastic body made of sponge mounted on a base plate, with carbon-impregnated sponge arranged in an array within the sponge. When the contacted object is compressed, the resistance of the carbon-impregnated sponge decreases; measuring the magnitude of the current flowing through the carbon-impregnated sponge determines the degree of compression. This sensor can also be used as a pressure sensor. Advantages include simple structure, good elasticity, and ease of use. Disadvantages are that the uniformity of carbon distribution directly affects measurement results, and recovery capability after compression is poor. 4) Carbon fiber type: Uses carbon fiber as the upper layer, a base plate as the lower layer, and urethane and metal electrodes installed in between. When contacting an external object, the carbon fiber is compressed and makes electrical contact with the electrodes. The advantage is good flexibility, allowing installation on curved surfaces of robotic arms, but hysteresis is significant. 5) Pneumatic reset type: It has a flexible insulating surface that deforms under pressure and uses compressed air as the resetting force when contact is released. When in contact with an external object, its internal elastic dome (beryllium copper foil) contacts the lower contacts to conduct electricity. Advantages include good flexibility and high reliability, but a compressed air source is required.

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