Vibrating load cell: When an elastic element is subjected to a force, its natural vibration frequency is proportional to the square root of the force. By measuring the change in the natural frequency, the force of the analyte acting on the elastic element can be calculated, and then its mass can be found. There are two types of vibrating sensors: vibrating wire type and tuning fork type.
The elastic element of a vibrating wire sensor is a string filament. When the measured object is added to the load-bearing table, the intersection point of the V-shaped string wire is pulled downward, and the tensile force of the left chord becomes larger, and the tensile force of the right chord decreases. The natural frequencies of the two strings change differently. Find the difference between the frequencies of the two strings to find the mass of the measured object. The accuracy of the vibrating wire sensor is high, up to 1/1000-1/10000, and the weighing range is from 100 grams to hundreds of kilograms, but the structure is complex, the processing is difficult, and the cost is high.
The elastic element of a tuning fork sensor is a tuning fork. A piezoelectric element is fixed at the end of the tuning fork, which oscillates at the natural frequency of the tuning fork and can be measured at the frequency of the oscillation. When the measured object is added to the load-bearing table, the natural frequency increases due to the force applied to the tuning fork in the direction of extension, and the degree of increase is proportional to the square root of the applied force. By measuring the change in the natural frequency, the force exerted by the weight on the tuning fork can be calculated, and then the mass of the weight can be found. The tuning fork sensor consumes less power, the measurement accuracy is as high as 1/10000-1/200000, and the weighing range is 500g-10kg.
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