Phep Thu Phan Biet

8/3/2019 Phep Thu Phan Biet

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TH C HNH NH GI C M QUANTH C PH M

Sensory Evaluation Practices

Php th phn bi t


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PHP TH PHN Bi T

PHP TH PHN Bi T

HAI S N PH M C KHC NHAU KHNG?Li u ngu i th c nh n bi t du c s khc nhau gi a hai s n

ph m hay nhi u s n ph m?


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PHP TH PHN Bi T

N i dung

L thuy t php th

Cc php th phn bi t

M c dch Cch ti n hnh Luu th nghi m


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PHP TH PHN Bi T

L thuy t c a php th phn bi t


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PHP TH PHN Bi T

L thuy t pht tn hi u

Phuong php v m hnh Thurstone

Ch s R: s d ng thang do


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PHP TH PHN Bi T

Cch ti n hnh m t php th

25-30 ngu i th

Ch n php thX l s li u: ki m d nh gi thuy t HoK t lu n: ngu i th c nh n th y s khcbi t gi a 2 m u hay khng


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PHP TH PHN Bi T

Php th phn bi t- don gi n

M c dch: phn bi t s khc nhau gi a ccm u s n ph m

C 5 lo i php th thng thu ng


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PHP TH PHN Bi T

So snh c p diHai m u khc/gi ng nhau?

Tam gicM u no khc nh t v i 2 m u cn

l i?

n-AFCM u no ng t hon so v i m u kia?

AnotACh n m u no l m u chu n A?

Hai-BaCh n m u no l m u chu n R

trong 2 m u?

A notAA

976821437

342 608 194

A A B

759035

B A

A BReference

976821437

759035

B A

2-AFC

Gi ng

Khc


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PHP TH PHN Bi T

Php th tam gic Triangle Test

M c dch: xc d nh s khc nhau chung v 2s n ph m v s khc nhau l nh i tu ng p d ng: khng c m u chu n vngu i th khng c n hu n luy n


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PHP TH PHN Bi T

Php th tam gic

Cch ti n hnh:

Ngu i th nh n du c 1 b (set) g m 3 m u th ,trong d c 2 m u gi ng nhau. Ngu i th du c yuc u th m u t tri sang ph i v xc d nh m u nokhc v i 2 m u cn l i.

V d :

6 t h p trnh by: AAB, ABA, BAA, BBA, BAB, ABBLuu : cch trnh by m u cn b ng cho cc ngu ith


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PHP TH PHN Bi T

Cch trnh by m u cho ngu i th d i v i php th

tam gic


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PHP TH PHN Bi T

Php th ph h p AnotA

M c dch: xem m t s n ph m c khc v i

s n ph m m u hay khng i tu ng p d ng: khi yu c u ngu i thph i nh nh ng tnh ch t c m quan c am u. Dng cho ngu i th l chuyn

gia/tuy n ch n


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PHP TH PHN Bi T

Php th AnotA

Cch ti n hnh:

Ngu i th dnh gi m u th nh t du c g i l m uA, yu c u ghi nh tnh ch t c a m u ny. Sau dm u A du c l y di.Ti p theo, ngu i th n m m u th 2 v cho bi tm u ny c gi ng m u th d u tin khng

V d :

Ngu i th s th 1 dy m u trong d c m u ALuu : cch trnh by m u cn b ng cho cc ngu ith


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PHP TH PHN Bi T

Php th n-AFC (Alternative ForcedChoice)

M c dch: xc d nh s khc nhau gi a cc s n

ph m v m t tnh ch t c m quan nh t d nh 2-AFC: 2 t h p m u AB, BA 3-AFC: 3 t h p m u: AAB,ABA, BAA ho c

ngu c l i i tu ng p d ng: khi d bi t tnh ch t m t c mquan c a m u th . Ngu i th khng qua hu n luy nTrnh by m u c n cn b ng v i s ngu i th


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PHP TH PHN Bi T

Cch ti n hnh

2-AFC: ngu i th c 1 b m u g m 2 s nph m v du c yu c u xc d nh m u no cm t tnh ch t c m quan (d d ng, ng t,chua) vu t tr i hon (more than)

3-AFC: ngu i th c 1 b m u g m 3 s nph m v du c yu c u xc d nh m u no cm t tnh ch t c m quan (d d ng, ng t,chua) vu t tr i hon (most)


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PHP TH PHN Bi T

Php th c p di khc bi t

M c dch: xc d nh s khc/gi ng nhau gi a hai

m u s n ph m. i tu ng p d ng: thay th cho php th tam gickhi s n ph m c tc d ng ko di, s n ph m ph ct p, ho c ch du c cung c p trong th i gian ng nho c khi s d ng 3 m u cng m t lc khng kh thi.

V d : c ph Arabica, RobustaT h p m u: AA, AB, BA, BB


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PHP TH PHN Bi T

Cch ti n hnh:

Ngu i th c 1 b m u g m 2 s n ph m vth theo th t t ph i sang tri v xc d nhhai m u ny gi ng/khc nhau


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PHP TH PHN Bi T

Cch trnh by m u cho ngu i th c a php

th c p di


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PHP TH PHN Bi T

Php th 2-3

M c dch:

i tu ng p d ng: m u R l m u ngu i thd quen thu c, m u cn l i l s n ph m m i.Ngu i th khng qua hu n luy nT h p m u: 2-3 m t pha: m u chu n R khng thay d i

RAAB, RABA

2-3 hai pha: m u chu n R thay d iRAAB, RABA, RBAB, RBBA


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PHP TH PHN Bi T

Cch ti n hnh:

Ngu i th nh n 1 b m u g m 1 m u chu n Rv 2 m u trong d c 1 m u gi ng m u R.ngu i th th m u R nhi u l n d thu cm u.

Sau d th 2 m u cn l i v xc d nh m u nogi ng m u R ban d u


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PHP TH PHN Bi T

Cch trnh by m u cho ngu i th d i v i

php th 2-3


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