Identification techniques and device for testing the efficacy of beauty care products and cosmetics

摘要

A method for testing the effect of a skin care product includes measuring a mechanical property of skin tissue using nonlinear stochastic system identification, applying the product to the skin, repeating the measurement of the mechanical property after the application of the product, and comparing the before and after measurements to quantify the effect of the product.;Measuring the mechanical property of the skin can include placing a probe against a surface of the skin, perturbing the skin with the probe using a stochastic sequence, and measuring the response of the skin to the perturbation. Perturbing the skin can include indenting the skin with the probe, extending the skin with the probe, and sliding the probe across the skin surface. The mechanical property may be indicative of skin compliance, skin elasticity, skin stiffness, or skin damping. The mechanical property can be dependent on perturbation depth and may be measured at a plurality of anatomical locations.

主权项

1. A method for testing the effect of a skin care product, the method comprising:
establishing a stochastic sequence and dynamic properties of a device such that, when the device is applied to skin tissue, a system that includes the device and skin tissue has system dynamics, including a system upper cutoff frequency and a displacement range, that enable measurement of a mechanical property of the skin tissue, the stochastic sequence being an input to the system and having an upper cutoff frequency greater than the system upper cutoff frequency but low enough such that the displacement range is sufficiently large to test depth-dependent nonlinearities of skin, the displacement range being 4 mm to 32 mm; measuring a mechanical property of the skin tissue with the device using stochastic system identification; applying the product to the skin; repeating the measurement of the mechanical property after the application of the product; and comparing the before and after measurements to quantify the effect of the product.