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

  • US 9,265,461 B2
  • Filed: 08/31/2010
  • Issued: 02/23/2016
  • Est. Priority Date: 09/01/2009
  • Status: Active Grant
First Claim
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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.

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