| 摘要 |
FIELD: measurement technology. SUBSTANCE: device to determine concentration of water-and-alcohol solution incorporates capacitive pickup with sensitive element which capacitance depends on dielectric permittivity of water-and-alcohol solution which in its turn is determined by concentration of alcohol in solution, temperature-sensitive element intended for compensation of temperature effect on readings of device, correction circuit, analog-to-digital converter, digital information display and stabilized power supply source. Capacitive pickup can be designed differently, in particular, in the form of generator with variable frequency which master circuit includes capacitor of sensitive element and frequency discriminator connected in series. Voltage across output of discriminator depends on capacitance of sensitive element and consequently on concentration of water-and-alcohol solution. EFFECT: increased authenticity of determination, automated control over production lines preparing alcoholic drinks. 1 cl, 5 dwg |
